#
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# a copy of this software and associated documentation files (the
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# without limitation the rights to use, copy, modify, merge, publish,
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

from __future__ import print_function

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import SCons.compat

import copy
import io
import os
import sys
import unittest
from collections import UserDict as UD, UserList as UL

import TestCmd
import TestUnit

from SCons.Environment import *
import SCons.Warnings

def diff_env(env1, env2):
    s1 = "env1 = {\n"
    s2 = "env2 = {\n"
    d = {}
    for k in list(env1._dict.keys()) + list(env2._dict.keys()):
        d[k] = None
    for k in sorted(d.keys()):
        if k in env1:
           if k in env2:
               if env1[k] != env2[k]:
                   s1 = s1 + "    " + repr(k) + " : " + repr(env1[k]) + "\n"
                   s2 = s2 + "    " + repr(k) + " : " + repr(env2[k]) + "\n"
           else:
               s1 = s1 + "    " + repr(k) + " : " + repr(env1[k]) + "\n"
        elif k in env2:
           s2 = s2 + "    " + repr(k) + " : " + repr(env2[k]) + "\n"
    s1 = s1 + "}\n"
    s2 = s2 + "}\n"
    return s1 + s2

def diff_dict(d1, d2):
    s1 = "d1 = {\n"
    s2 = "d2 = {\n"
    d = {}
    for k in list(d1.keys()) + list(d2.keys()):
        d[k] = None
    for k in sorted(d.keys()):
        if k in d1:
           if k in d2:
               if d1[k] != d2[k]:
                   s1 = s1 + "    " + repr(k) + " : " + repr(d1[k]) + "\n"
                   s2 = s2 + "    " + repr(k) + " : " + repr(d2[k]) + "\n"
           else:
               s1 = s1 + "    " + repr(k) + " : " + repr(d1[k]) + "\n"
        elif k in env2:
           s2 = s2 + "    " + repr(k) + " : " + repr(d2[k]) + "\n"
    s1 = s1 + "}\n"
    s2 = s2 + "}\n"
    return s1 + s2

called_it = {}
built_it = {}

class Builder(SCons.Builder.BuilderBase):
    """A dummy Builder class for testing purposes.  "Building"
    a target is simply setting a value in the dictionary.
    """
    def __init__(self, name = None):
        self.name = name

    def __call__(self, env, target=None, source=None, **kw):
        global called_it
        called_it['target'] = target
        called_it['source'] = source
        called_it.update(kw)

    def execute(self, target = None, **kw):
        global built_it
        built_it[target] = 1



scanned_it = {}

class Scanner(object):
    """A dummy Scanner class for testing purposes.  "Scanning"
    a target is simply setting a value in the dictionary.
    """
    def __init__(self, name, skeys=[]):
        self.name = name
        self.skeys = skeys

    def __call__(self, filename):
        global scanned_it
        scanned_it[filename] = 1

    def __eq__(self, other):
        try:
            return self.__dict__ == other.__dict__
        except AttributeError:
            return False

    def get_skeys(self, env):
        return self.skeys

    def __str__(self):
        return self.name



class CLVar(UL):
    def __init__(self, seq):
        if isinstance(seq, str):
            seq = seq.split()
        UL.__init__(self, seq)
    def __add__(self, other):
        return UL.__add__(self, CLVar(other))
    def __radd__(self, other):
        return UL.__radd__(self, CLVar(other))
    def __coerce__(self, other):
        return (self, CLVar(other))



class DummyNode(object):
    def __init__(self, name):
        self.name = name
    def __str__(self):
        return self.name
    def rfile(self):
        return self
    def get_subst_proxy(self):
        return self

def test_tool( env ):
    env['_F77INCFLAGS'] = '$( ${_concat(INCPREFIX, F77PATH, INCSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)'

class TestEnvironmentFixture(object):
    def TestEnvironment(self, *args, **kw):
        if not kw or 'tools' not in kw:
            kw['tools'] = [test_tool]
        default_keys = { 'CC' : 'cc',
                         'CCFLAGS' : '-DNDEBUG',
                         'ENV' : { 'TMP' : '/tmp' } }
        for key, value in default_keys.items():
            if key not in kw:
                kw[key] = value
        if 'BUILDERS' not in kw:
            static_obj = SCons.Builder.Builder(action = {},
                                               emitter = {},
                                               suffix = '.o',
                                               single_source = 1)
            kw['BUILDERS'] = {'Object' : static_obj}
            static_obj.add_action('.cpp', 'fake action')

        env = Environment(*args, **kw)
        return env

class SubstitutionTestCase(unittest.TestCase):

    def test___init__(self):
        """Test initializing a SubstitutionEnvironment
        """
        env = SubstitutionEnvironment()
        assert '__env__' not in env

    def test___cmp__(self):
        """Test comparing SubstitutionEnvironments
        """

        env1 = SubstitutionEnvironment(XXX = 'x')
        env2 = SubstitutionEnvironment(XXX = 'x')
        env3 = SubstitutionEnvironment(XXX = 'xxx')
        env4 = SubstitutionEnvironment(XXX = 'x', YYY = 'x')

        assert env1 == env2
        assert env1 != env3
        assert env1 != env4

    def test___delitem__(self):
        """Test deleting a variable from a SubstitutionEnvironment
        """
        env1 = SubstitutionEnvironment(XXX = 'x', YYY = 'y')
        env2 = SubstitutionEnvironment(XXX = 'x')
        del env1['YYY']
        assert env1 == env2

    def test___getitem__(self):
        """Test fetching a variable from a SubstitutionEnvironment
        """
        env = SubstitutionEnvironment(XXX = 'x')
        assert env['XXX'] == 'x', env['XXX']

    def test___setitem__(self):
        """Test setting a variable in a SubstitutionEnvironment
        """
        env1 = SubstitutionEnvironment(XXX = 'x')
        env2 = SubstitutionEnvironment(XXX = 'x', YYY = 'y')
        env1['YYY'] = 'y'
        assert env1 == env2

    def test_get(self):
        """Test the SubstitutionEnvironment get() method
        """
        env = SubstitutionEnvironment(XXX = 'x')
        assert env.get('XXX') == 'x', env.get('XXX')
        assert env.get('YYY') is None, env.get('YYY')

    def test_has_key(self):
        """Test the SubstitutionEnvironment has_key() method
        """
        env = SubstitutionEnvironment(XXX = 'x')
        assert 'XXX' in env
        assert 'YYY' not in env

    def test_contains(self):
        """Test the SubstitutionEnvironment __contains__() method
        """
        env = SubstitutionEnvironment(XXX = 'x')
        assert 'XXX' in env
        assert not 'YYY' in env

    def test_items(self):
        """Test the SubstitutionEnvironment items() method
        """
        env = SubstitutionEnvironment(XXX = 'x', YYY = 'y')
        items = list(env.items())
        assert len(items) == 2 and ('XXX','x') in items and ('YYY','y') in items, items
        # Was. This fails under py3 as order changes
        # assert items == [('XXX','x'), ('YYY','y')], items

    def test_arg2nodes(self):
        """Test the arg2nodes method
        """
        env = SubstitutionEnvironment()
        dict = {}
        class X(SCons.Node.Node):
            pass
        def Factory(name, directory = None, create = 1, dict=dict, X=X):
            if name not in dict:
                dict[name] = X()
                dict[name].name = name
            return dict[name]

        nodes = env.arg2nodes("Util.py UtilTests.py", Factory)
        assert len(nodes) == 1, nodes
        assert isinstance(nodes[0], X)
        assert nodes[0].name == "Util.py UtilTests.py"

        nodes = env.arg2nodes(u"Util.py UtilTests.py", Factory)
        assert len(nodes) == 1, nodes
        assert isinstance(nodes[0], X)
        assert nodes[0].name == u"Util.py UtilTests.py"

        nodes = env.arg2nodes(["Util.py", "UtilTests.py"], Factory)
        assert len(nodes) == 2, nodes
        assert isinstance(nodes[0], X)
        assert isinstance(nodes[1], X)
        assert nodes[0].name == "Util.py"
        assert nodes[1].name == "UtilTests.py"

        n1 = Factory("Util.py")
        nodes = env.arg2nodes([n1, "UtilTests.py"], Factory)
        assert len(nodes) == 2, nodes
        assert isinstance(nodes[0], X)
        assert isinstance(nodes[1], X)
        assert nodes[0].name == "Util.py"
        assert nodes[1].name == "UtilTests.py"

        class SConsNode(SCons.Node.Node):
            pass
        nodes = env.arg2nodes(SConsNode())
        assert len(nodes) == 1, nodes
        assert isinstance(nodes[0], SConsNode), node

        class OtherNode(object):
            pass
        nodes = env.arg2nodes(OtherNode())
        assert len(nodes) == 1, nodes
        assert isinstance(nodes[0], OtherNode), node

        def lookup_a(str, F=Factory):
            if str[0] == 'a':
                n = F(str)
                n.a = 1
                return n
            else:
                return None

        def lookup_b(str, F=Factory):
            if str[0] == 'b':
                n = F(str)
                n.b = 1
                return n
            else:
                return None

        env_ll = SubstitutionEnvironment()
        env_ll.lookup_list = [lookup_a, lookup_b]

        nodes = env_ll.arg2nodes(['aaa', 'bbb', 'ccc'], Factory)
        assert len(nodes) == 3, nodes

        assert nodes[0].name == 'aaa', nodes[0]
        assert nodes[0].a == 1, nodes[0]
        assert not hasattr(nodes[0], 'b'), nodes[0]

        assert nodes[1].name == 'bbb'
        assert not hasattr(nodes[1], 'a'), nodes[1]
        assert nodes[1].b == 1, nodes[1]

        assert nodes[2].name == 'ccc'
        assert not hasattr(nodes[2], 'a'), nodes[1]
        assert not hasattr(nodes[2], 'b'), nodes[1]

        def lookup_bbbb(str, F=Factory):
            if str == 'bbbb':
                n = F(str)
                n.bbbb = 1
                return n
            else:
                return None

        def lookup_c(str, F=Factory):
            if str[0] == 'c':
                n = F(str)
                n.c = 1
                return n
            else:
                return None

        nodes = env.arg2nodes(['bbbb', 'ccc'], Factory,
                                     [lookup_c, lookup_bbbb, lookup_b])
        assert len(nodes) == 2, nodes

        assert nodes[0].name == 'bbbb'
        assert not hasattr(nodes[0], 'a'), nodes[1]
        assert not hasattr(nodes[0], 'b'), nodes[1]
        assert nodes[0].bbbb == 1, nodes[1]
        assert not hasattr(nodes[0], 'c'), nodes[0]

        assert nodes[1].name == 'ccc'
        assert not hasattr(nodes[1], 'a'), nodes[1]
        assert not hasattr(nodes[1], 'b'), nodes[1]
        assert not hasattr(nodes[1], 'bbbb'), nodes[0]
        assert nodes[1].c == 1, nodes[1]

    def test_arg2nodes_target_source(self):
        """Test the arg2nodes method with target= and source= keywords
        """
        targets = [DummyNode('t1'), DummyNode('t2')]
        sources = [DummyNode('s1'), DummyNode('s2')]
        env = SubstitutionEnvironment()
        nodes = env.arg2nodes(['${TARGET}-a',
                               '${SOURCE}-b',
                               '${TARGETS[1]}-c',
                               '${SOURCES[1]}-d'],
                              DummyNode,
                              target=targets,
                              source=sources)
        names = [n.name for n in nodes]
        assert names == ['t1-a', 's1-b', 't2-c', 's2-d'], names

    def test_gvars(self):
        """Test the base class gvars() method"""
        env = SubstitutionEnvironment()
        gvars = env.gvars()
        assert gvars == {}, gvars

    def test_lvars(self):
        """Test the base class lvars() method"""
        env = SubstitutionEnvironment()
        lvars = env.lvars()
        assert lvars == {}, lvars

    def test_subst(self):
        """Test substituting construction variables within strings

        Check various combinations, including recursive expansion
        of variables into other variables.
        """
        env = SubstitutionEnvironment(AAA = 'a', BBB = 'b')
        mystr = env.subst("$AAA ${AAA}A $BBBB $BBB")
        assert mystr == "a aA b", mystr

        # Changed the tests below to reflect a bug fix in
        # subst()
        env = SubstitutionEnvironment(AAA = '$BBB', BBB = 'b', BBBA = 'foo')
        mystr = env.subst("$AAA ${AAA}A ${AAA}B $BBB")
        assert mystr == "b bA bB b", mystr

        env = SubstitutionEnvironment(AAA = '$BBB', BBB = '$CCC', CCC = 'c')
        mystr = env.subst("$AAA ${AAA}A ${AAA}B $BBB")
        assert mystr == "c cA cB c", mystr

        # Lists:
        env = SubstitutionEnvironment(AAA = ['a', 'aa', 'aaa'])
        mystr = env.subst("$AAA")
        assert mystr == "a aa aaa", mystr

        # Tuples:
        env = SubstitutionEnvironment(AAA = ('a', 'aa', 'aaa'))
        mystr = env.subst("$AAA")
        assert mystr == "a aa aaa", mystr

        t1 = DummyNode('t1')
        t2 = DummyNode('t2')
        s1 = DummyNode('s1')
        s2 = DummyNode('s2')

        env = SubstitutionEnvironment(AAA = 'aaa')
        s = env.subst('$AAA $TARGET $SOURCES', target=[t1, t2], source=[s1, s2])
        assert s == "aaa t1 s1 s2", s
        s = env.subst('$AAA $TARGETS $SOURCE', target=[t1, t2], source=[s1, s2])
        assert s == "aaa t1 t2 s1", s

        # Test callables in the SubstitutionEnvironment
        def foo(target, source, env, for_signature):
            assert str(target) == 't', target
            assert str(source) == 's', source
            return env["FOO"]

        env = SubstitutionEnvironment(BAR=foo, FOO='baz')
        t = DummyNode('t')
        s = DummyNode('s')

        subst = env.subst('test $BAR', target=t, source=s)
        assert subst == 'test baz', subst

        # Test not calling callables in the SubstitutionEnvironment
        if 0:
            # This will take some serious surgery to subst() and
            # subst_list(), so just leave these tests out until we can
            # do that.
            def bar(arg):
                pass

            env = SubstitutionEnvironment(BAR=bar, FOO='$BAR')

            subst = env.subst('$BAR', call=None)
            assert subst is bar, subst

            subst = env.subst('$FOO', call=None)
            assert subst is bar, subst

    def test_subst_kw(self):
        """Test substituting construction variables within dictionaries"""
        env = SubstitutionEnvironment(AAA = 'a', BBB = 'b')
        kw = env.subst_kw({'$AAA' : 'aaa', 'bbb' : '$BBB'})
        assert len(kw) == 2, kw
        assert kw['a'] == 'aaa', kw['a']
        assert kw['bbb'] == 'b', kw['bbb']

    def test_subst_list(self):
        """Test substituting construction variables in command lists
        """
        env = SubstitutionEnvironment(AAA = 'a', BBB = 'b')
        l = env.subst_list("$AAA ${AAA}A $BBBB $BBB")
        assert l == [["a", "aA", "b"]], l

        # Changed the tests below to reflect a bug fix in
        # subst()
        env = SubstitutionEnvironment(AAA = '$BBB', BBB = 'b', BBBA = 'foo')
        l = env.subst_list("$AAA ${AAA}A ${AAA}B $BBB")
        assert l == [["b", "bA", "bB", "b"]], l

        env = SubstitutionEnvironment(AAA = '$BBB', BBB = '$CCC', CCC = 'c')
        l = env.subst_list("$AAA ${AAA}A ${AAA}B $BBB")
        assert l == [["c", "cA", "cB", "c"]], mystr

        env = SubstitutionEnvironment(AAA = '$BBB', BBB = '$CCC', CCC = [ 'a', 'b\nc' ])
        lst = env.subst_list([ "$AAA", "B $CCC" ])
        assert lst == [[ "a", "b"], ["c", "B a", "b"], ["c"]], lst

        t1 = DummyNode('t1')
        t2 = DummyNode('t2')
        s1 = DummyNode('s1')
        s2 = DummyNode('s2')

        env = SubstitutionEnvironment(AAA = 'aaa')
        s = env.subst_list('$AAA $TARGET $SOURCES', target=[t1, t2], source=[s1, s2])
        assert s == [["aaa", "t1", "s1", "s2"]], s
        s = env.subst_list('$AAA $TARGETS $SOURCE', target=[t1, t2], source=[s1, s2])
        assert s == [["aaa", "t1", "t2", "s1"]], s

        # Test callables in the SubstitutionEnvironment
        def foo(target, source, env, for_signature):
            assert str(target) == 't', target
            assert str(source) == 's', source
            return env["FOO"]

        env = SubstitutionEnvironment(BAR=foo, FOO='baz')
        t = DummyNode('t')
        s = DummyNode('s')

        lst = env.subst_list('test $BAR', target=t, source=s)
        assert lst == [['test', 'baz']], lst

        # Test not calling callables in the SubstitutionEnvironment
        if 0:
            # This will take some serious surgery to subst() and
            # subst_list(), so just leave these tests out until we can
            # do that.
            def bar(arg):
                pass

            env = SubstitutionEnvironment(BAR=bar, FOO='$BAR')

            subst = env.subst_list('$BAR', call=None)
            assert subst is bar, subst

            subst = env.subst_list('$FOO', call=None)
            assert subst is bar, subst

    def test_subst_path(self):
        """Test substituting a path list
        """
        class MyProxy(object):
            def __init__(self, val):
                self.val = val
            def get(self):
                return self.val + '-proxy'

        class MyNode(object):
            def __init__(self, val):
                self.val = val
            def get_subst_proxy(self):
                return self
            def __str__(self):
                return self.val

        class MyObj(object):
            def get(self):
                return self

        env = SubstitutionEnvironment(FOO='foo',
                                      BAR='bar',
                                      LIST=['one', 'two'],
                                      PROXY=MyProxy('my1'))

        r = env.subst_path('$FOO')
        assert r == ['foo'], r

        r = env.subst_path(['$FOO', 'xxx', '$BAR'])
        assert r == ['foo', 'xxx', 'bar'], r

        r = env.subst_path(['$FOO', '$LIST', '$BAR'])
        assert list(map(str, r)) == ['foo', 'one two', 'bar'], r

        r = env.subst_path(['$FOO', '$TARGET', '$SOURCE', '$BAR'])
        assert r == ['foo', '', '', 'bar'], r

        r = env.subst_path(['$FOO', '$TARGET', '$BAR'], target=MyNode('ttt'))
        assert list(map(str, r)) == ['foo', 'ttt', 'bar'], r

        r = env.subst_path(['$FOO', '$SOURCE', '$BAR'], source=MyNode('sss'))
        assert list(map(str, r)) == ['foo', 'sss', 'bar'], r

        n = MyObj()

        r = env.subst_path(['$PROXY', MyProxy('my2'), n])
        assert r == ['my1-proxy', 'my2-proxy', n], r

        class StringableObj(object):
            def __init__(self, s):
                self.s = s
            def __str__(self):
                return self.s

        env = SubstitutionEnvironment(FOO=StringableObj("foo"),
                          BAR=StringableObj("bar"))

        r = env.subst_path([ "${FOO}/bar", "${BAR}/baz" ])
        assert r == [ "foo/bar", "bar/baz" ], r

        r = env.subst_path([ "bar/${FOO}", "baz/${BAR}" ])
        assert r == [ "bar/foo", "baz/bar" ], r

        r = env.subst_path([ "bar/${FOO}/bar", "baz/${BAR}/baz" ])
        assert r == [ "bar/foo/bar", "baz/bar/baz" ], r

    def test_subst_target_source(self):
        """Test the base environment subst_target_source() method"""
        env = SubstitutionEnvironment(AAA = 'a', BBB = 'b')
        mystr = env.subst_target_source("$AAA ${AAA}A $BBBB $BBB")
        assert mystr == "a aA b", mystr

    def test_backtick(self):
        """Test the backtick() method for capturing command output"""
        env = SubstitutionEnvironment()

        test = TestCmd.TestCmd(workdir = '')
        test.write('stdout.py', """\
import sys
sys.stdout.write('this came from stdout.py\\n')
sys.exit(0)
""")
        test.write('stderr.py', """\
import sys
sys.stderr.write('this came from stderr.py\\n')
sys.exit(0)
""")
        test.write('fail.py', """\
import sys
sys.exit(1)
""")
        test.write('echo.py', """\
import os, sys
sys.stdout.write(os.environ['ECHO'] + '\\n')
sys.exit(0)
""")

        save_stderr = sys.stderr

        python = '"' + sys.executable + '"'

        try:
            sys.stderr = io.StringIO()
            cmd = '%s %s' % (python, test.workpath('stdout.py'))
            output = env.backtick(cmd)
            errout = sys.stderr.getvalue()
            assert output == 'this came from stdout.py\n', output
            assert errout == '', errout

            sys.stderr = io.StringIO()
            cmd = '%s %s' % (python, test.workpath('stderr.py'))
            output = env.backtick(cmd)
            errout = sys.stderr.getvalue()
            assert output == '', output
            assert errout == 'this came from stderr.py\n', errout

            sys.stderr = io.StringIO()
            cmd = '%s %s' % (python, test.workpath('fail.py'))
            try:
                env.backtick(cmd)
            except OSError as e:
                assert str(e) == "'%s' exited 1" % cmd, str(e)
            else:
                self.fail("did not catch expected OSError")

            sys.stderr = io.StringIO()
            cmd = '%s %s' % (python, test.workpath('echo.py'))
            env['ENV'] = os.environ.copy()
            env['ENV']['ECHO'] = 'this came from ECHO'
            output = env.backtick(cmd)
            errout = sys.stderr.getvalue()
            assert output == 'this came from ECHO\n', output
            assert errout == '', errout

        finally:
            sys.stderr = save_stderr

    def test_AddMethod(self):
        """Test the AddMethod() method"""
        env = SubstitutionEnvironment(FOO = 'foo')

        def func(self):
            return 'func-' + self['FOO']

        assert not hasattr(env, 'func')
        env.AddMethod(func)
        r = env.func()
        assert r == 'func-foo', r

        assert not hasattr(env, 'bar')
        env.AddMethod(func, 'bar')
        r = env.bar()
        assert r == 'func-foo', r

        def func2(self, arg=''):
            return 'func2-' + self['FOO'] + arg

        env.AddMethod(func2)
        r = env.func2()
        assert r == 'func2-foo', r
        r = env.func2('-xxx')
        assert r == 'func2-foo-xxx', r

        env.AddMethod(func2, 'func')
        r = env.func()
        assert r == 'func2-foo', r
        r = env.func('-yyy')
        assert r == 'func2-foo-yyy', r

        # Test that clones of clones correctly re-bind added methods.
        env1 = Environment(FOO = '1')
        env1.AddMethod(func2)
        env2 = env1.Clone(FOO = '2')
        env3 = env2.Clone(FOO = '3')
        env4 = env3.Clone(FOO = '4')
        r = env1.func2()
        assert r == 'func2-1', r
        r = env2.func2()
        assert r == 'func2-2', r
        r = env3.func2()
        assert r == 'func2-3', r
        r = env4.func2()
        assert r == 'func2-4', r

        # Test that clones don't re-bind an attribute that the user
        env1 = Environment(FOO = '1')
        env1.AddMethod(func2)
        def replace_func2():
            return 'replace_func2'
        env1.func2 = replace_func2
        env2 = env1.Clone(FOO = '2')
        r = env2.func2()
        assert r == 'replace_func2', r

    def test_Override(self):
        "Test overriding construction variables"
        env = SubstitutionEnvironment(ONE=1, TWO=2, THREE=3, FOUR=4)
        assert env['ONE'] == 1, env['ONE']
        assert env['TWO'] == 2, env['TWO']
        assert env['THREE'] == 3, env['THREE']
        assert env['FOUR'] == 4, env['FOUR']

        env2 = env.Override({'TWO'   : '10',
                             'THREE' :'x $THREE y',
                             'FOUR'  : ['x', '$FOUR', 'y']})
        assert env2['ONE'] == 1, env2['ONE']
        assert env2['TWO'] == '10', env2['TWO']
        assert env2['THREE'] == 'x 3 y', env2['THREE']
        assert env2['FOUR'] == ['x', 4, 'y'], env2['FOUR']

        assert env['ONE'] == 1, env['ONE']
        assert env['TWO'] == 2, env['TWO']
        assert env['THREE'] == 3, env['THREE']
        assert env['FOUR'] == 4, env['FOUR']

        env2.Replace(ONE = "won")
        assert env2['ONE'] == "won", env2['ONE']
        assert env['ONE'] == 1, env['ONE']

    def test_ParseFlags(self):
        """Test the ParseFlags() method
        """
        env = SubstitutionEnvironment()

        empty = {
            'ASFLAGS'       : [],
            'CFLAGS'        : [],
            'CCFLAGS'       : [],
            'CXXFLAGS'      : [],
            'CPPDEFINES'    : [],
            'CPPFLAGS'      : [],
            'CPPPATH'       : [],
            'FRAMEWORKPATH' : [],
            'FRAMEWORKS'    : [],
            'LIBPATH'       : [],
            'LIBS'          : [],
            'LINKFLAGS'     : [],
            'RPATH'         : [],
        }

        d = env.ParseFlags(None)
        assert d == empty, d

        d = env.ParseFlags('')
        assert d == empty, d

        d = env.ParseFlags([])
        assert d == empty, d

        s = "-I/usr/include/fum -I bar -X\n" + \
            '-I"C:\\Program Files\\ASCEND\\include" ' + \
            "-L/usr/fax -L foo -lxxx -l yyy " + \
            '-L"C:\\Program Files\\ASCEND" -lascend ' + \
            "-Wa,-as -Wl,-link " + \
            "-Wl,-rpath=rpath1 " + \
            "-Wl,-R,rpath2 " + \
            "-Wl,-Rrpath3 " + \
            "-Wp,-cpp " + \
            "-std=c99 " + \
            "-std=c++0x " + \
            "-framework Carbon " + \
            "-frameworkdir=fwd1 " + \
            "-Ffwd2 " + \
            "-F fwd3 " + \
            "-dylib_file foo-dylib " + \
            "-pthread " + \
            "-fopenmp " + \
            "-mno-cygwin -mwindows " + \
            "-arch i386 -isysroot /tmp " + \
            "-isystem /usr/include/foo " + \
            "+DD64 " + \
            "-DFOO -DBAR=value -D BAZ "

        d = env.ParseFlags(s)

        assert d['ASFLAGS'] == ['-as'], d['ASFLAGS']
        assert d['CFLAGS']  == ['-std=c99']
        assert d['CCFLAGS'] == ['-X', '-Wa,-as',
                                  '-pthread', '-fopenmp', '-mno-cygwin',
                                  ('-arch', 'i386'), ('-isysroot', '/tmp'),
                                  ('-isystem', '/usr/include/foo'),
                                  '+DD64'], repr(d['CCFLAGS'])
        assert d['CXXFLAGS'] == ['-std=c++0x'], repr(d['CXXFLAGS'])
        assert d['CPPDEFINES'] == ['FOO', ['BAR', 'value'], 'BAZ'], d['CPPDEFINES']
        assert d['CPPFLAGS'] == ['-Wp,-cpp'], d['CPPFLAGS']
        assert d['CPPPATH'] == ['/usr/include/fum',
                                'bar',
                                'C:\\Program Files\\ASCEND\\include'], d['CPPPATH']
        assert d['FRAMEWORKPATH'] == ['fwd1', 'fwd2', 'fwd3'], d['FRAMEWORKPATH']
        assert d['FRAMEWORKS'] == ['Carbon'], d['FRAMEWORKS']
        assert d['LIBPATH'] == ['/usr/fax',
                                'foo',
                                'C:\\Program Files\\ASCEND'], d['LIBPATH']
        LIBS = list(map(str, d['LIBS']))
        assert LIBS == ['xxx', 'yyy', 'ascend'], (d['LIBS'], LIBS)
        assert d['LINKFLAGS'] == ['-Wl,-link',
                                  '-dylib_file', 'foo-dylib',
                                  '-pthread', '-fopenmp',
                                  '-mno-cygwin', '-mwindows',
                                  ('-arch', 'i386'),
                                  ('-isysroot', '/tmp'),
                                  '+DD64'], repr(d['LINKFLAGS'])
        assert d['RPATH'] == ['rpath1', 'rpath2', 'rpath3'], d['RPATH']


    def test_MergeFlags(self):
        """Test the MergeFlags() method
        """
        env = SubstitutionEnvironment()
        env.MergeFlags('')
        assert 'CCFLAGS' not in env, env['CCFLAGS']
        env.MergeFlags('-X')
        assert env['CCFLAGS'] == ['-X'], env['CCFLAGS']
        env.MergeFlags('-X')
        assert env['CCFLAGS'] == ['-X'], env['CCFLAGS']

        env = SubstitutionEnvironment(CCFLAGS=None)
        env.MergeFlags('-Y')
        assert env['CCFLAGS'] == ['-Y'], env['CCFLAGS']

        env = SubstitutionEnvironment()
        env.MergeFlags({'A':['aaa'], 'B':['bbb']})
        assert env['A'] == ['aaa'], env['A']
        assert env['B'] == ['bbb'], env['B']


class BaseTestCase(unittest.TestCase,TestEnvironmentFixture):

    reserved_variables = [
        'CHANGED_SOURCES',
        'CHANGED_TARGETS',
        'SOURCE',
        'SOURCES',
        'TARGET',
        'TARGETS',
        'UNCHANGED_SOURCES',
        'UNCHANGED_TARGETS',
    ]

    def test___init__(self):
        """Test construction Environment creation

        Create two with identical arguments and check that
        they compare the same.
        """
        env1 = self.TestEnvironment(XXX = 'x', YYY = 'y')
        env2 = self.TestEnvironment(XXX = 'x', YYY = 'y')
        assert env1 == env2, diff_env(env1, env2)

        assert '__env__' not in env1
        assert '__env__' not in env2

    def test_variables(self):
        """Test that variables only get applied once."""
        class FakeOptions(object):
            def __init__(self, key, val):
                self.calls = 0
                self.key = key
                self.val = val
            def keys(self):
                return [self.key]
            def Update(self, env):
                env[self.key] = self.val
                self.calls = self.calls + 1

        o = FakeOptions('AAA', 'fake_opt')
        env = Environment(variables=o, AAA='keyword_arg')
        assert o.calls == 1, o.calls
        assert env['AAA'] == 'fake_opt', env['AAA']

    def test_get(self):
        """Test the get() method."""
        env = self.TestEnvironment(aaa = 'AAA')

        x = env.get('aaa')
        assert x == 'AAA', x
        x = env.get('aaa', 'XXX')
        assert x == 'AAA', x
        x = env.get('bbb')
        assert x is None, x
        x = env.get('bbb', 'XXX')
        assert x == 'XXX', x

    def test_Builder_calls(self):
        """Test Builder calls through different environments
        """
        global called_it

        b1 = Builder()
        b2 = Builder()

        env = Environment()
        env.Replace(BUILDERS = { 'builder1' : b1,
                                 'builder2' : b2 })
        called_it = {}
        env.builder1('in1')
        assert called_it['target'] is None, called_it
        assert called_it['source'] == ['in1'], called_it

        called_it = {}
        env.builder2(source = 'in2', xyzzy = 1)
        assert called_it['target'] is None, called_it
        assert called_it['source'] == ['in2'], called_it
        assert called_it['xyzzy'] == 1, called_it

        called_it = {}
        env.builder1(foo = 'bar')
        assert called_it['foo'] == 'bar', called_it
        assert called_it['target'] is None, called_it
        assert called_it['source'] is None, called_it

    def test_BuilderWrapper_attributes(self):
        """Test getting and setting of BuilderWrapper attributes
        """
        b1 = Builder()
        b2 = Builder()
        e1 = Environment()
        e2 = Environment()

        e1.Replace(BUILDERS = {'b' : b1})
        bw = e1.b

        assert bw.env is e1
        bw.env = e2
        assert bw.env is e2

        assert bw.builder is b1
        bw.builder = b2
        assert bw.builder is b2

        self.assertRaises(AttributeError, getattr, bw, 'foobar')
        bw.foobar = 42
        assert bw.foobar is 42

    # This unit test is currently disabled because we don't think the
    # underlying method it tests (Environment.BuilderWrapper.execute())
    # is necessary, but we're leaving the code here for now in case
    # that's mistaken.
    def _DO_NOT_test_Builder_execs(self):
        """Test Builder execution through different environments

        One environment is initialized with a single
        Builder object, one with a list of a single Builder
        object, and one with a list of two Builder objects.
        """
        global built_it

        b1 = Builder()
        b2 = Builder()

        built_it = {}
        env3 = Environment()
        env3.Replace(BUILDERS = { 'builder1' : b1,
                                  'builder2' : b2 })
        env3.builder1.execute(target = 'out1')
        env3.builder2.execute(target = 'out2')
        env3.builder1.execute(target = 'out3')
        assert built_it['out1']
        assert built_it['out2']
        assert built_it['out3']

        env4 = env3.Clone()
        assert env4.builder1.env is env4, "builder1.env (%s) == env3 (%s)?" % (
env4.builder1.env, env3)
        assert env4.builder2.env is env4, "builder2.env (%s) == env3 (%s)?" % (
env4.builder1.env, env3)

        # Now test BUILDERS as a dictionary.
        built_it = {}
        env5 = self.TestEnvironment(BUILDERS={ 'foo' : b1 })
        env5['BUILDERS']['bar'] = b2
        env5.foo.execute(target='out1')
        env5.bar.execute(target='out2')
        assert built_it['out1']
        assert built_it['out2']

        built_it = {}
        env6 = Environment()
        env6['BUILDERS'] = { 'foo' : b1,
                             'bar' : b2 }
        env6.foo.execute(target='out1')
        env6.bar.execute(target='out2')
        assert built_it['out1']
        assert built_it['out2']



    def test_Scanners(self):
        """Test setting SCANNERS in various ways

        One environment is initialized with a single
        Scanner object, one with a list of a single Scanner
        object, and one with a list of two Scanner objects.
        """
        global scanned_it

        s1 = Scanner(name = 'scanner1', skeys = [".c", ".cc"])
        s2 = Scanner(name = 'scanner2', skeys = [".m4"])
        s3 = Scanner(name = 'scanner3', skeys = [".m4", ".m5"])
        s4 = Scanner(name = 'scanner4', skeys = [None])

#        XXX Tests for scanner execution through different environments,
#        XXX if we ever want to do that some day
#        scanned_it = {}
#        env1 = self.TestEnvironment(SCANNERS = s1)
#        env1.scanner1(filename = 'out1')
#        assert scanned_it['out1']
#
#        scanned_it = {}
#        env2 = self.TestEnvironment(SCANNERS = [s1])
#        env1.scanner1(filename = 'out1')
#        assert scanned_it['out1']
#
#        scanned_it = {}
#        env3 = Environment()
#        env3.Replace(SCANNERS = [s1])
#        env3.scanner1(filename = 'out1')
#        env3.scanner2(filename = 'out2')
#        env3.scanner1(filename = 'out3')
#        assert scanned_it['out1']
#        assert scanned_it['out2']
#        assert scanned_it['out3']

        suffixes = [".c", ".cc", ".cxx", ".m4", ".m5"]

        env = Environment()
        try: del env['SCANNERS']
        except KeyError: pass
        s = list(map(env.get_scanner, suffixes))
        assert s == [None, None, None, None, None], s

        env = self.TestEnvironment(SCANNERS = [])
        s = list(map(env.get_scanner, suffixes))
        assert s == [None, None, None, None, None], s

        env.Replace(SCANNERS = [s1])
        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, None, None], s

        env.Append(SCANNERS = [s2])
        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, s2, None], s

        env.AppendUnique(SCANNERS = [s3])
        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, s2, s3], s

        env = env.Clone(SCANNERS = [s2])
        s = list(map(env.get_scanner, suffixes))
        assert s == [None, None, None, s2, None], s

        env['SCANNERS'] = [s1]
        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, None, None], s

        env.PrependUnique(SCANNERS = [s2, s1])
        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, s2, None], s

        env.Prepend(SCANNERS = [s3])
        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, s3, s3], s

        # Verify behavior of case-insensitive suffix matches on Windows.
        uc_suffixes = [_.upper() for _ in suffixes]

        env = Environment(SCANNERS = [s1, s2, s3],
                          PLATFORM = 'linux')

        s = list(map(env.get_scanner, suffixes))
        assert s == [s1, s1, None, s2, s3], s

        s = list(map(env.get_scanner, uc_suffixes))
        assert s == [None, None, None, None, None], s

        env['PLATFORM'] = 'win32'

        s = list(map(env.get_scanner, uc_suffixes))
        assert s == [s1, s1, None, s2, s3], s

        # Verify behavior for a scanner returning None (on Windows
        # where we might try to perform case manipulation on None).
        env.Replace(SCANNERS = [s4])
        s = list(map(env.get_scanner, suffixes))
        assert s == [None, None, None, None, None], s

    def test_ENV(self):
        """Test setting the external ENV in Environments
        """
        env = Environment()
        assert 'ENV' in env.Dictionary()

        env = self.TestEnvironment(ENV = { 'PATH' : '/foo:/bar' })
        assert env.Dictionary('ENV')['PATH'] == '/foo:/bar'

    def test_ReservedVariables(self):
        """Test warning generation when reserved variable names are set"""

        reserved_variables = [
            'CHANGED_SOURCES',
            'CHANGED_TARGETS',
            'SOURCE',
            'SOURCES',
            'TARGET',
            'TARGETS',
            'UNCHANGED_SOURCES',
            'UNCHANGED_TARGETS',
        ]

        warning = SCons.Warnings.ReservedVariableWarning
        SCons.Warnings.enableWarningClass(warning)
        old = SCons.Warnings.warningAsException(1)

        try:
            env4 = Environment()
            for kw in self.reserved_variables:
                exc_caught = None
                try:
                    env4[kw] = 'xyzzy'
                except warning:
                    exc_caught = 1
                assert exc_caught, "Did not catch ReservedVariableWarning for `%s'" % kw
                assert kw not in env4, "`%s' variable was incorrectly set" % kw
        finally:
            SCons.Warnings.warningAsException(old)

    def test_FutureReservedVariables(self):
        """Test warning generation when future reserved variable names are set"""

        future_reserved_variables = []

        warning = SCons.Warnings.FutureReservedVariableWarning
        SCons.Warnings.enableWarningClass(warning)
        old = SCons.Warnings.warningAsException(1)

        try:
            env4 = Environment()
            for kw in future_reserved_variables:
                exc_caught = None
                try:
                    env4[kw] = 'xyzzy'
                except warning:
                    exc_caught = 1
                assert exc_caught, "Did not catch FutureReservedVariableWarning for `%s'" % kw
                assert kw in env4, "`%s' variable was not set" % kw
        finally:
            SCons.Warnings.warningAsException(old)

    def test_IllegalVariables(self):
        """Test that use of illegal variables raises an exception"""
        env = Environment()
        def test_it(var, env=env):
            exc_caught = None
            try:
                env[var] = 1
            except SCons.Errors.UserError:
                exc_caught = 1
            assert exc_caught, "did not catch UserError for '%s'" % var
        env['aaa'] = 1
        assert env['aaa'] == 1, env['aaa']
        test_it('foo/bar')
        test_it('foo.bar')
        test_it('foo-bar')

    def test_autogenerate(dict):
        """Test autogenerating variables in a dictionary."""

        drive, p = os.path.splitdrive(os.getcwd())
        def normalize_path(path, drive=drive):
            if path[0] in '\\/':
                path = drive + path
            path = os.path.normpath(path)
            drive, path = os.path.splitdrive(path)
            return drive.lower() + path

        env = dict.TestEnvironment(LIBS = [ 'foo', 'bar', 'baz' ],
                          LIBLINKPREFIX = 'foo',
                          LIBLINKSUFFIX = 'bar')

        def RDirs(pathlist, fs=env.fs):
            return fs.Dir('xx').Rfindalldirs(pathlist)

        env['RDirs'] = RDirs
        flags = env.subst_list('$_LIBFLAGS', 1)[0]
        assert flags == ['foobar', 'foobar', 'foobazbar'], flags

        blat = env.fs.Dir('blat')

        env.Replace(CPPPATH = [ 'foo', '$FOO/bar', blat ],
                    INCPREFIX = 'foo ',
                    INCSUFFIX = 'bar',
                    FOO = 'baz')
        flags = env.subst_list('$_CPPINCFLAGS', 1)[0]
        expect = [ '$(',
                   normalize_path('foo'),
                   normalize_path('xx/foobar'),
                   normalize_path('foo'),
                   normalize_path('xx/baz/bar'),
                   normalize_path('foo'),
                   normalize_path('blatbar'),
                   '$)',
        ]
        assert flags == expect, flags

        env.Replace(F77PATH = [ 'foo', '$FOO/bar', blat ],
                    INCPREFIX = 'foo ',
                    INCSUFFIX = 'bar',
                    FOO = 'baz')
        flags = env.subst_list('$_F77INCFLAGS', 1)[0]
        expect = [ '$(',
                   normalize_path('foo'),
                   normalize_path('xx/foobar'),
                   normalize_path('foo'),
                   normalize_path('xx/baz/bar'),
                   normalize_path('foo'),
                   normalize_path('blatbar'),
                   '$)',
        ]
        assert flags == expect, flags

        env.Replace(CPPPATH = '', F77PATH = '', LIBPATH = '')
        l = env.subst_list('$_CPPINCFLAGS')
        assert l == [[]], l
        l = env.subst_list('$_F77INCFLAGS')
        assert l == [[]], l
        l = env.subst_list('$_LIBDIRFLAGS')
        assert l == [[]], l

        env.fs.Repository('/rep1')
        env.fs.Repository('/rep2')
        env.Replace(CPPPATH = [ 'foo', '/__a__/b', '$FOO/bar', blat],
                    INCPREFIX = '-I ',
                    INCSUFFIX = 'XXX',
                    FOO = 'baz')
        flags = env.subst_list('$_CPPINCFLAGS', 1)[0]
        expect = [ '$(',
                   '-I', normalize_path('xx/fooXXX'),
                   '-I', normalize_path('/rep1/xx/fooXXX'),
                   '-I', normalize_path('/rep2/xx/fooXXX'),
                   '-I', normalize_path('/__a__/bXXX'),
                   '-I', normalize_path('xx/baz/barXXX'),
                   '-I', normalize_path('/rep1/xx/baz/barXXX'),
                   '-I', normalize_path('/rep2/xx/baz/barXXX'),
                   '-I', normalize_path('blatXXX'),
                   '$)'
        ]
        def normalize_if_path(arg, np=normalize_path):
            if arg not in ('$(','$)','-I'):
                return np(str(arg))
            return arg
        flags = list(map(normalize_if_path, flags))
        assert flags == expect, flags

    def test_platform(self):
        """Test specifying a platform callable when instantiating."""
        class platform(object):
            def __str__(self):        return "TestPlatform"
            def __call__(self, env):  env['XYZZY'] = 777

        def tool(env):
            env['SET_TOOL'] = 'initialized'
            assert env['PLATFORM'] == "TestPlatform"

        env = self.TestEnvironment(platform = platform(), tools = [tool])
        assert env['XYZZY'] == 777, env
        assert env['PLATFORM'] == "TestPlatform"
        assert env['SET_TOOL'] == "initialized"

    def test_Default_PLATFORM(self):
        """Test overriding the default PLATFORM variable"""
        class platform(object):
            def __str__(self):        return "DefaultTestPlatform"
            def __call__(self, env):  env['XYZZY'] = 888

        def tool(env):
            env['SET_TOOL'] = 'abcde'
            assert env['PLATFORM'] == "DefaultTestPlatform"

        import SCons.Defaults
        save = SCons.Defaults.ConstructionEnvironment.copy()
        try:
            import SCons.Defaults
            SCons.Defaults.ConstructionEnvironment.update({
                'PLATFORM' : platform(),
            })
            env = self.TestEnvironment(tools = [tool])
            assert env['XYZZY'] == 888, env
            assert env['PLATFORM'] == "DefaultTestPlatform"
            assert env['SET_TOOL'] == "abcde"
        finally:
            SCons.Defaults.ConstructionEnvironment = save

    def test_tools(self):
        """Test specifying a tool callable when instantiating."""
        def t1(env):
            env['TOOL1'] = 111
        def t2(env):
            env['TOOL2'] = 222
        def t3(env):
            env['AAA'] = env['XYZ']
        def t4(env):
            env['TOOL4'] = 444
        env = self.TestEnvironment(tools = [t1, t2, t3], XYZ = 'aaa')
        assert env['TOOL1'] == 111, env['TOOL1']
        assert env['TOOL2'] == 222, env
        assert env['AAA'] == 'aaa', env
        t4(env)
        assert env['TOOL4'] == 444, env

        test = TestCmd.TestCmd(workdir = '')
        test.write('faketool.py', """\
def generate(env, **kw):
    for k, v in kw.items():
        env[k] = v

def exists(env):
    return 1
""")

        env = self.TestEnvironment(tools = [('faketool', {'a':1, 'b':2, 'c':3})],
                          toolpath = [test.workpath('')])
        assert env['a'] == 1, env['a']
        assert env['b'] == 2, env['b']
        assert env['c'] == 3, env['c']

    def test_Default_TOOLS(self):
        """Test overriding the default TOOLS variable"""
        def t5(env):
            env['TOOL5'] = 555
        def t6(env):
            env['TOOL6'] = 666
        def t7(env):
            env['BBB'] = env['XYZ']
        def t8(env):
            env['TOOL8'] = 888

        import SCons.Defaults
        save = SCons.Defaults.ConstructionEnvironment.copy()
        try:
            SCons.Defaults.ConstructionEnvironment.update({
                'TOOLS' : [t5, t6, t7],
            })
            env = Environment(XYZ = 'bbb')
            assert env['TOOL5'] == 555, env['TOOL5']
            assert env['TOOL6'] == 666, env
            assert env['BBB'] == 'bbb', env
            t8(env)
            assert env['TOOL8'] == 888, env
        finally:
            SCons.Defaults.ConstructionEnvironment = save

    def test_null_tools(self):
        """Test specifying a tool of None is OK."""
        def t1(env):
            env['TOOL1'] = 111
        def t2(env):
            env['TOOL2'] = 222
        env = self.TestEnvironment(tools = [t1, None, t2], XYZ = 'aaa')
        assert env['TOOL1'] == 111, env['TOOL1']
        assert env['TOOL2'] == 222, env
        assert env['XYZ'] == 'aaa', env
        env = self.TestEnvironment(tools = [None], XYZ = 'xyz')
        assert env['XYZ'] == 'xyz', env
        env = self.TestEnvironment(tools = [t1, '', t2], XYZ = 'ddd')
        assert env['TOOL1'] == 111, env['TOOL1']
        assert env['TOOL2'] == 222, env
        assert env['XYZ'] == 'ddd', env

    def test_concat(self):
        "Test _concat()"
        e1 = self.TestEnvironment(PRE='pre', SUF='suf', STR='a b', LIST=['a', 'b'])
        s = e1.subst
        x = s("${_concat('', '', '', __env__)}")
        assert x == '', x
        x = s("${_concat('', [], '', __env__)}")
        assert x == '', x
        x = s("${_concat(PRE, '', SUF, __env__)}")
        assert x == '', x
        x = s("${_concat(PRE, STR, SUF, __env__)}")
        assert x == 'prea bsuf', x
        x = s("${_concat(PRE, LIST, SUF, __env__)}")
        assert x == 'preasuf prebsuf', x

    def test_concat_nested(self):
        "Test _concat() on a nested substitution strings."
        e = self.TestEnvironment(PRE='pre', SUF='suf',
                                 L1=['a', 'b'],
                                 L2=['c', 'd'],
                                 L3=['$L2'])
        x = e.subst('$( ${_concat(PRE, L1, SUF, __env__)} $)')
        assert x == 'preasuf prebsuf', x
        e.AppendUnique(L1 = ['$L2'])
        x = e.subst('$( ${_concat(PRE, L1, SUF, __env__)} $)')
        assert x == 'preasuf prebsuf precsuf predsuf', x
        e.AppendUnique(L1 = ['$L3'])
        x = e.subst('$( ${_concat(PRE, L1, SUF, __env__)} $)')
        assert x == 'preasuf prebsuf precsuf predsuf precsuf predsuf', x

    def test_gvars(self):
        """Test the Environment gvars() method"""
        env = self.TestEnvironment(XXX = 'x', YYY = 'y', ZZZ = 'z')
        gvars = env.gvars()
        assert gvars['XXX'] == 'x', gvars['XXX']
        assert gvars['YYY'] == 'y', gvars['YYY']
        assert gvars['ZZZ'] == 'z', gvars['ZZZ']

    def test__update(self):
        """Test the _update() method"""
        env = self.TestEnvironment(X = 'x', Y = 'y', Z = 'z')
        assert env['X'] == 'x', env['X']
        assert env['Y'] == 'y', env['Y']
        assert env['Z'] == 'z', env['Z']
        env._update({'X'       : 'xxx',
                     'TARGET'  : 't',
                     'TARGETS' : 'ttt',
                     'SOURCE'  : 's',
                     'SOURCES' : 'sss',
                     'Z'       : 'zzz'})
        assert env['X'] == 'xxx', env['X']
        assert env['Y'] == 'y', env['Y']
        assert env['Z'] == 'zzz', env['Z']
        assert env['TARGET'] == 't', env['TARGET']
        assert env['TARGETS'] == 'ttt', env['TARGETS']
        assert env['SOURCE'] == 's', env['SOURCE']
        assert env['SOURCES'] == 'sss', env['SOURCES']

    def test_Append(self):
        """Test appending to construction variables in an Environment
        """

        b1 = Environment()['BUILDERS']
        b2 = Environment()['BUILDERS']
        assert b1 == b2, diff_dict(b1, b2)

        cases = [
            'a1',       'A1',           'a1A1',
            'a2',       ['A2'],         ['a2', 'A2'],
            'a3',       UL(['A3']),     UL(['a', '3', 'A3']),
            'a4',       '',             'a4',
            'a5',       [],             ['a5'],
            'a6',       UL([]),         UL(['a', '6']),
            'a7',       [''],           ['a7', ''],
            'a8',       UL(['']),       UL(['a', '8', '']),

            ['e1'],     'E1',           ['e1', 'E1'],
            ['e2'],     ['E2'],         ['e2', 'E2'],
            ['e3'],     UL(['E3']),     UL(['e3', 'E3']),
            ['e4'],     '',             ['e4'],
            ['e5'],     [],             ['e5'],
            ['e6'],     UL([]),         UL(['e6']),
            ['e7'],     [''],           ['e7', ''],
            ['e8'],     UL(['']),       UL(['e8', '']),

            UL(['i1']), 'I1',           UL(['i1', 'I', '1']),
            UL(['i2']), ['I2'],         UL(['i2', 'I2']),
            UL(['i3']), UL(['I3']),     UL(['i3', 'I3']),
            UL(['i4']), '',             UL(['i4']),
            UL(['i5']), [],             UL(['i5']),
            UL(['i6']), UL([]),         UL(['i6']),
            UL(['i7']), [''],           UL(['i7', '']),
            UL(['i8']), UL(['']),       UL(['i8', '']),

            {'d1':1},   'D1',           {'d1':1, 'D1':None},
            {'d2':1},   ['D2'],         {'d2':1, 'D2':None},
            {'d3':1},   UL(['D3']),     {'d3':1, 'D3':None},
            {'d4':1},   {'D4':1},       {'d4':1, 'D4':1},
            {'d5':1},   UD({'D5':1}),   UD({'d5':1, 'D5':1}),

            UD({'u1':1}), 'U1',         UD({'u1':1, 'U1':None}),
            UD({'u2':1}), ['U2'],       UD({'u2':1, 'U2':None}),
            UD({'u3':1}), UL(['U3']),   UD({'u3':1, 'U3':None}),
            UD({'u4':1}), {'U4':1},     UD({'u4':1, 'U4':1}),
            UD({'u5':1}), UD({'U5':1}), UD({'u5':1, 'U5':1}),

            '',         'M1',           'M1',
            '',         ['M2'],         ['M2'],
            '',         UL(['M3']),     UL(['M3']),
            '',         '',             '',
            '',         [],             [],
            '',         UL([]),         UL([]),
            '',         [''],           [''],
            '',         UL(['']),       UL(['']),

            [],         'N1',           ['N1'],
            [],         ['N2'],         ['N2'],
            [],         UL(['N3']),     UL(['N3']),
            [],         '',             [],
            [],         [],             [],
            [],         UL([]),         UL([]),
            [],         [''],           [''],
            [],         UL(['']),       UL(['']),

            UL([]),     'O1',           ['O', '1'],
            UL([]),     ['O2'],         ['O2'],
            UL([]),     UL(['O3']),     UL(['O3']),
            UL([]),     '',             UL([]),
            UL([]),     [],             UL([]),
            UL([]),     UL([]),         UL([]),
            UL([]),     [''],           UL(['']),
            UL([]),     UL(['']),       UL(['']),

            [''],       'P1',           ['', 'P1'],
            [''],       ['P2'],         ['', 'P2'],
            [''],       UL(['P3']),     UL(['', 'P3']),
            [''],       '',             [''],
            [''],       [],             [''],
            [''],       UL([]),         UL(['']),
            [''],       [''],           ['', ''],
            [''],       UL(['']),       UL(['', '']),

            UL(['']),   'Q1',           ['', 'Q', '1'],
            UL(['']),   ['Q2'],         ['', 'Q2'],
            UL(['']),   UL(['Q3']),     UL(['', 'Q3']),
            UL(['']),   '',             UL(['']),
            UL(['']),   [],             UL(['']),
            UL(['']),   UL([]),         UL(['']),
            UL(['']),   [''],           UL(['', '']),
            UL(['']),   UL(['']),       UL(['', '']),
        ]

        env = Environment()
        failed = 0
        while cases:
            input, append, expect = cases[:3]
            env['XXX'] = copy.copy(input)
            try:
                env.Append(XXX = append)
            except Exception as e:
                if failed == 0: print()
                print("    %s Append %s exception: %s" % \
                      (repr(input), repr(append), e))
                failed = failed + 1
            else:
                result = env['XXX']
                if result != expect:
                    if failed == 0: print()
                    print("    %s Append %s => %s did not match %s" % \
                          (repr(input), repr(append), repr(result), repr(expect)))
                    failed = failed + 1
            del cases[:3]
        assert failed == 0, "%d Append() cases failed" % failed

        env['UL'] = UL(['foo'])
        env.Append(UL = 'bar')
        result = env['UL']
        assert isinstance(result, UL), repr(result)
        assert result == ['foo', 'b', 'a', 'r'], result

        env['CLVar'] = CLVar(['foo'])
        env.Append(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['foo', 'bar'], result

        class C(object):
            def __init__(self, name):
                self.name = name
            def __str__(self):
                return self.name
            def __eq__(self, other):
                raise Exception("should not compare")

        ccc = C('ccc')

        env2 = self.TestEnvironment(CCC1 = ['c1'], CCC2 = ccc)
        env2.Append(CCC1 = ccc, CCC2 = ['c2'])
        assert env2['CCC1'][0] == 'c1', env2['CCC1']
        assert env2['CCC1'][1] is ccc, env2['CCC1']
        assert env2['CCC2'][0] is ccc, env2['CCC2']
        assert env2['CCC2'][1] == 'c2', env2['CCC2']

        env3 = self.TestEnvironment(X = {'x1' : 7})
        env3.Append(X = {'x1' : 8, 'x2' : 9}, Y = {'y1' : 10})
        assert env3['X'] == {'x1': 8, 'x2': 9}, env3['X']
        assert env3['Y'] == {'y1': 10}, env3['Y']

        z1 = Builder()
        z2 = Builder()
        env4 = self.TestEnvironment(BUILDERS = {'z1' : z1})
        env4.Append(BUILDERS = {'z2' : z2})
        assert env4['BUILDERS'] == {'z1' : z1, 'z2' : z2}, env4['BUILDERS']
        assert hasattr(env4, 'z1')
        assert hasattr(env4, 'z2')

    def test_AppendENVPath(self):
        """Test appending to an ENV path."""
        env1 = self.TestEnvironment(ENV = {'PATH': r'C:\dir\num\one;C:\dir\num\two'},
                           MYENV = {'MYPATH': r'C:\mydir\num\one;C:\mydir\num\two'})
        # have to include the pathsep here so that the test will work on UNIX too.
        env1.AppendENVPath('PATH',r'C:\dir\num\two', sep = ';')
        env1.AppendENVPath('PATH',r'C:\dir\num\three', sep = ';')
        env1.AppendENVPath('MYPATH',r'C:\mydir\num\three','MYENV', sep = ';')
        env1.AppendENVPath('MYPATH',r'C:\mydir\num\one','MYENV', sep = ';')
        # this should do nothing since delete_existing is 0
        env1.AppendENVPath('MYPATH',r'C:\mydir\num\three','MYENV', sep = ';', delete_existing=0)
        assert(env1['ENV']['PATH'] == r'C:\dir\num\one;C:\dir\num\two;C:\dir\num\three')
        assert(env1['MYENV']['MYPATH'] == r'C:\mydir\num\two;C:\mydir\num\three;C:\mydir\num\one')

        test = TestCmd.TestCmd(workdir = '')
        test.subdir('sub1', 'sub2')
        p=env1['ENV']['PATH']
        env1.AppendENVPath('PATH','#sub1', sep = ';')
        env1.AppendENVPath('PATH',env1.fs.Dir('sub2'), sep = ';')
        assert env1['ENV']['PATH'] == p + ';sub1;sub2', env1['ENV']['PATH']

    def test_AppendUnique(self):
        """Test appending to unique values to construction variables

        This strips values that are already present when lists are
        involved."""
        env = self.TestEnvironment(AAA1 = 'a1',
                          AAA2 = 'a2',
                          AAA3 = 'a3',
                          AAA4 = 'a4',
                          AAA5 = 'a5',
                          BBB1 = ['b1'],
                          BBB2 = ['b2'],
                          BBB3 = ['b3'],
                          BBB4 = ['b4'],
                          BBB5 = ['b5'],
                          CCC1 = '',
                          CCC2 = '',
                          DDD1 = ['a', 'b', 'c'])
        env['LL1'] = [env.Literal('a literal'), env.Literal('b literal')]
        env['LL2'] = [env.Literal('c literal'), env.Literal('b literal')]
        env.AppendUnique(AAA1 = 'a1',
                         AAA2 = ['a2'],
                         AAA3 = ['a3', 'b', 'c', 'c', 'b', 'a3'], # ignore dups
                         AAA4 = 'a4.new',
                         AAA5 = ['a5.new'],
                         BBB1 = 'b1',
                         BBB2 = ['b2'],
                         BBB3 = ['b3', 'c', 'd', 'c', 'b3'],
                         BBB4 = 'b4.new',
                         BBB5 = ['b5.new'],
                         CCC1 = 'c1',
                         CCC2 = ['c2'],
                         DDD1 = 'b',
                         LL1  = env.Literal('a literal'),
                         LL2  = env.Literal('a literal'))

        assert env['AAA1'] == 'a1a1', env['AAA1']
        assert env['AAA2'] == ['a2'], env['AAA2']
        assert env['AAA3'] == ['a3', 'b', 'c'], env['AAA3']
        assert env['AAA4'] == 'a4a4.new', env['AAA4']
        assert env['AAA5'] == ['a5', 'a5.new'], env['AAA5']
        assert env['BBB1'] == ['b1'], env['BBB1']
        assert env['BBB2'] == ['b2'], env['BBB2']
        assert env['BBB3'] == ['b3', 'c', 'd'], env['BBB3']
        assert env['BBB4'] == ['b4', 'b4.new'], env['BBB4']
        assert env['BBB5'] == ['b5', 'b5.new'], env['BBB5']
        assert env['CCC1'] == 'c1', env['CCC1']
        assert env['CCC2'] == ['c2'], env['CCC2']
        assert env['DDD1'] == ['a', 'b', 'c'], env['DDD1']
        assert env['LL1']  == [env.Literal('a literal'), env.Literal('b literal')], env['LL1']
        assert env['LL2']  == [env.Literal('c literal'), env.Literal('b literal'), env.Literal('a literal')], [str(x) for x in env['LL2']]

        env.AppendUnique(DDD1 = 'b', delete_existing=1)
        assert env['DDD1'] == ['a', 'c', 'b'], env['DDD1'] # b moves to end
        env.AppendUnique(DDD1 = ['a','b'], delete_existing=1)
        assert env['DDD1'] == ['c', 'a', 'b'], env['DDD1'] # a & b move to end
        env.AppendUnique(DDD1 = ['e','f', 'e'], delete_existing=1)
        assert env['DDD1'] == ['c', 'a', 'b', 'f', 'e'], env['DDD1'] # add last

        env['CLVar'] = CLVar([])
        env.AppendUnique(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['bar'], result

        env['CLVar'] = CLVar(['abc'])
        env.AppendUnique(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['abc', 'bar'], result

        env['CLVar'] = CLVar(['bar'])
        env.AppendUnique(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['bar'], result

    def test_Clone(self):
        """Test construction environment copying

        Update the copy independently afterwards and check that
        the original remains intact (that is, no dangling
        references point to objects in the copied environment).
        Clone the original with some construction variable
        updates and check that the original remains intact
        and the copy has the updated values.
        """
        env1 = self.TestEnvironment(XXX = 'x', YYY = 'y')
        env2 = env1.Clone()
        env1copy = env1.Clone()
        assert env1copy == env1copy
        assert env2 == env2
        env2.Replace(YYY = 'yyy')
        assert env2 == env2
        assert env1 != env2
        assert env1 == env1copy

        env3 = env1.Clone(XXX = 'x3', ZZZ = 'z3')
        assert env3 == env3
        assert env3.Dictionary('XXX') == 'x3'
        assert env3.Dictionary('YYY') == 'y'
        assert env3.Dictionary('ZZZ') == 'z3'
        assert env1 == env1copy

        # Ensure that lists and dictionaries are
        # deep copied, but not instances.
        class TestA(object):
            pass
        env1 = self.TestEnvironment(XXX=TestA(), YYY = [ 1, 2, 3 ],
                           ZZZ = { 1:2, 3:4 })
        env2=env1.Clone()
        env2.Dictionary('YYY').append(4)
        env2.Dictionary('ZZZ')[5] = 6
        assert env1.Dictionary('XXX') is env2.Dictionary('XXX')
        assert 4 in env2.Dictionary('YYY')
        assert not 4 in env1.Dictionary('YYY')
        assert 5 in env2.Dictionary('ZZZ')
        assert 5 not in env1.Dictionary('ZZZ')

        #
        env1 = self.TestEnvironment(BUILDERS = {'b1' : Builder()})
        assert hasattr(env1, 'b1'), "env1.b1 was not set"
        assert env1.b1.object == env1, "b1.object doesn't point to env1"
        env2 = env1.Clone(BUILDERS = {'b2' : Builder()})
        assert env2 is env2
        assert env2 == env2
        assert hasattr(env1, 'b1'), "b1 was mistakenly cleared from env1"
        assert env1.b1.object == env1, "b1.object was changed"
        assert not hasattr(env2, 'b1'), "b1 was not cleared from env2"
        assert hasattr(env2, 'b2'), "env2.b2 was not set"
        assert env2.b2.object == env2, "b2.object doesn't point to env2"

        # Ensure that specifying new tools in a copied environment
        # works.
        def foo(env): env['FOO'] = 1
        def bar(env): env['BAR'] = 2
        def baz(env): env['BAZ'] = 3
        env1 = self.TestEnvironment(tools=[foo])
        env2 = env1.Clone()
        env3 = env1.Clone(tools=[bar, baz])

        assert env1.get('FOO') is 1
        assert env1.get('BAR') is None
        assert env1.get('BAZ') is None
        assert env2.get('FOO') is 1
        assert env2.get('BAR') is None
        assert env2.get('BAZ') is None
        assert env3.get('FOO') is 1
        assert env3.get('BAR') is 2
        assert env3.get('BAZ') is 3

        # Ensure that recursive variable substitution when copying
        # environments works properly.
        env1 = self.TestEnvironment(CCFLAGS = '-DFOO', XYZ = '-DXYZ')
        env2 = env1.Clone(CCFLAGS = '$CCFLAGS -DBAR',
                         XYZ = ['-DABC', 'x $XYZ y', '-DDEF'])
        x = env2.get('CCFLAGS')
        assert x == '-DFOO -DBAR', x
        x = env2.get('XYZ')
        assert x == ['-DABC', 'x -DXYZ y', '-DDEF'], x

        # Ensure that special properties of a class don't get
        # lost on copying.
        env1 = self.TestEnvironment(FLAGS = CLVar('flag1 flag2'))
        x = env1.get('FLAGS')
        assert x == ['flag1', 'flag2'], x
        env2 = env1.Clone()
        env2.Append(FLAGS = 'flag3 flag4')
        x = env2.get('FLAGS')
        assert x == ['flag1', 'flag2', 'flag3', 'flag4'], x
        x = env1.get('FLAGS')
        assert x == ['flag1', 'flag2'], x

        # Ensure that appending directly to a copied CLVar
        # doesn't modify the original.
        env1 = self.TestEnvironment(FLAGS = CLVar('flag1 flag2'))
        x = env1.get('FLAGS')
        assert x == ['flag1', 'flag2'], x
        env2 = env1.Clone()
        env2['FLAGS'] += ['flag3', 'flag4']
        x = env2.get('FLAGS')
        assert x == ['flag1', 'flag2', 'flag3', 'flag4'], x
        x = env1.get('FLAGS')
        assert x == ['flag1', 'flag2'], x

        # Test that the environment stores the toolpath and
        # re-uses it for copies.
        test = TestCmd.TestCmd(workdir = '')

        test.write('xxx.py', """\
def exists(env):
    1
def generate(env):
    env['XXX'] = 'one'
""")

        test.write('yyy.py', """\
def exists(env):
    1
def generate(env):
    env['YYY'] = 'two'
""")

        env = self.TestEnvironment(tools=['xxx'], toolpath=[test.workpath('')])
        assert env['XXX'] == 'one', env['XXX']
        env = env.Clone(tools=['yyy'])
        assert env['YYY'] == 'two', env['YYY']


        # Test that
        real_value = [4]

        def my_tool(env, rv=real_value):
            assert env['KEY_THAT_I_WANT'] == rv[0]
            env['KEY_THAT_I_WANT'] = rv[0] + 1

        env = self.TestEnvironment()

        real_value[0] = 5
        env = env.Clone(KEY_THAT_I_WANT=5, tools=[my_tool])
        assert env['KEY_THAT_I_WANT'] == real_value[0], env['KEY_THAT_I_WANT']

        real_value[0] = 6
        env = env.Clone(KEY_THAT_I_WANT=6, tools=[my_tool])
        assert env['KEY_THAT_I_WANT'] == real_value[0], env['KEY_THAT_I_WANT']

        # test for pull request #150
        env = self.TestEnvironment()
        env._dict.pop('BUILDERS')
        assert ('BUILDERS' in env) is False
        env2 = env.Clone()

    def test_Copy(self):
        """Test copying using the old env.Copy() method"""
        env1 = self.TestEnvironment(XXX = 'x', YYY = 'y')
        env2 = env1.Copy()
        env1copy = env1.Copy()
        assert env1copy == env1copy
        assert env2 == env2
        env2.Replace(YYY = 'yyy')
        assert env2 == env2
        assert env1 != env2
        assert env1 == env1copy

    def test_Detect(self):
        """Test Detect()ing tools"""
        test = TestCmd.TestCmd(workdir = '')
        test.subdir('sub1', 'sub2')
        sub1 = test.workpath('sub1')
        sub2 = test.workpath('sub2')

        if sys.platform == 'win32':
            test.write(['sub1', 'xxx'], "sub1/xxx\n")
            test.write(['sub2', 'xxx'], "sub2/xxx\n")

            env = self.TestEnvironment(ENV = { 'PATH' : [sub1, sub2] })

            x = env.Detect('xxx.exe')
            assert x is None, x

            test.write(['sub2', 'xxx.exe'], "sub2/xxx.exe\n")

            env = self.TestEnvironment(ENV = { 'PATH' : [sub1, sub2] })

            x = env.Detect('xxx.exe')
            assert x == 'xxx.exe', x

            test.write(['sub1', 'xxx.exe'], "sub1/xxx.exe\n")

            x = env.Detect('xxx.exe')
            assert x == 'xxx.exe', x

        else:
            test.write(['sub1', 'xxx.exe'], "sub1/xxx.exe\n")
            test.write(['sub2', 'xxx.exe'], "sub2/xxx.exe\n")

            env = self.TestEnvironment(ENV = { 'PATH' : [sub1, sub2] })

            x = env.Detect('xxx.exe')
            assert x is None, x

            sub2_xxx_exe = test.workpath('sub2', 'xxx.exe')
            os.chmod(sub2_xxx_exe, 0o755)

            env = self.TestEnvironment(ENV = { 'PATH' : [sub1, sub2] })

            x = env.Detect('xxx.exe')
            assert x == 'xxx.exe', x

            sub1_xxx_exe = test.workpath('sub1', 'xxx.exe')
            os.chmod(sub1_xxx_exe, 0o755)

            x = env.Detect('xxx.exe')
            assert x == 'xxx.exe', x

        env = self.TestEnvironment(ENV = { 'PATH' : [] })
        x = env.Detect('xxx.exe')
        assert x is None, x

    def test_Dictionary(self):
        """Test retrieval of known construction variables

        Fetch them from the Dictionary and check for well-known
        defaults that get inserted.
        """
        env = self.TestEnvironment(XXX = 'x', YYY = 'y', ZZZ = 'z')
        assert env.Dictionary('XXX') == 'x'
        assert env.Dictionary('YYY') == 'y'
        assert env.Dictionary('XXX', 'ZZZ') == ['x', 'z']
        xxx, zzz = env.Dictionary('XXX', 'ZZZ')
        assert xxx == 'x'
        assert zzz == 'z'
        assert 'BUILDERS' in env.Dictionary()
        assert 'CC' in env.Dictionary()
        assert 'CCFLAGS' in env.Dictionary()
        assert 'ENV' in env.Dictionary()

        assert env['XXX'] == 'x'
        env['XXX'] = 'foo'
        assert env.Dictionary('XXX') == 'foo'
        del env['XXX']
        assert 'XXX' not in env.Dictionary()

    def test_FindIxes(self):
        "Test FindIxes()"
        env = self.TestEnvironment(LIBPREFIX='lib',
                          LIBSUFFIX='.a',
                          SHLIBPREFIX='lib',
                          SHLIBSUFFIX='.so',
                          PREFIX='pre',
                          SUFFIX='post')

        paths = [os.path.join('dir', 'libfoo.a'),
                 os.path.join('dir', 'libfoo.so')]

        assert paths[0] == env.FindIxes(paths, 'LIBPREFIX', 'LIBSUFFIX')
        assert paths[1] == env.FindIxes(paths, 'SHLIBPREFIX', 'SHLIBSUFFIX')
        assert None is env.FindIxes(paths, 'PREFIX', 'POST')

        paths = ['libfoo.a', 'prefoopost']

        assert paths[0] == env.FindIxes(paths, 'LIBPREFIX', 'LIBSUFFIX')
        assert None is env.FindIxes(paths, 'SHLIBPREFIX', 'SHLIBSUFFIX')
        assert paths[1] == env.FindIxes(paths, 'PREFIX', 'SUFFIX')

    def test_ParseConfig(self):
        """Test the ParseConfig() method"""
        env = self.TestEnvironment(COMMAND='command',
                          ASFLAGS='assembler',
                          CCFLAGS=[''],
                          CPPDEFINES=[],
                          CPPFLAGS=[''],
                          CPPPATH='string',
                          FRAMEWORKPATH=[],
                          FRAMEWORKS=[],
                          LIBPATH=['list'],
                          LIBS='',
                          LINKFLAGS=[''],
                          RPATH=[])

        orig_backtick = env.backtick
        class my_backtick(object):
            def __init__(self, save_command, output):
                self.save_command = save_command
                self.output = output
            def __call__(self, command):
                self.save_command.append(command)
                return self.output

        try:
            save_command = []
            env.backtick = my_backtick(save_command,
                                 "-I/usr/include/fum -I bar -X\n" + \
                                 "-L/usr/fax -L foo -lxxx -l yyy " + \
                                 "-Wa,-as -Wl,-link " + \
                                 "-Wl,-rpath=rpath1 " + \
                                 "-Wl,-R,rpath2 " + \
                                 "-Wl,-Rrpath3 " + \
                                 "-Wp,-cpp abc " + \
                                 "-framework Carbon " + \
                                 "-frameworkdir=fwd1 " + \
                                 "-Ffwd2 " + \
                                 "-F fwd3 " + \
                                 "-pthread " + \
                                 "-mno-cygwin -mwindows " + \
                                 "-arch i386 -isysroot /tmp " + \
                                 "-isystem /usr/include/foo " + \
                                 "+DD64 " + \
                                 "-DFOO -DBAR=value")
            env.ParseConfig("fake $COMMAND")
            assert save_command == ['fake command'], save_command
            assert env['ASFLAGS'] == ['assembler', '-as'], env['ASFLAGS']
            assert env['CCFLAGS'] == ['', '-X', '-Wa,-as',
                                      '-pthread', '-mno-cygwin',
                                      ('-arch', 'i386'), ('-isysroot', '/tmp'),
                                      ('-isystem', '/usr/include/foo'),
                                      '+DD64'], env['CCFLAGS']
            assert env['CPPDEFINES'] == ['FOO', ['BAR', 'value']], env['CPPDEFINES']
            assert env['CPPFLAGS'] == ['', '-Wp,-cpp'], env['CPPFLAGS']
            assert env['CPPPATH'] == ['string', '/usr/include/fum', 'bar'], env['CPPPATH']
            assert env['FRAMEWORKPATH'] == ['fwd1', 'fwd2', 'fwd3'], env['FRAMEWORKPATH']
            assert env['FRAMEWORKS'] == ['Carbon'], env['FRAMEWORKS']
            assert env['LIBPATH'] == ['list', '/usr/fax', 'foo'], env['LIBPATH']
            assert env['LIBS'] == ['xxx', 'yyy', env.File('abc')], env['LIBS']
            assert env['LINKFLAGS'] == ['', '-Wl,-link', '-pthread',
                                        '-mno-cygwin', '-mwindows',
                                        ('-arch', 'i386'),
                                        ('-isysroot', '/tmp'),
                                        '+DD64'], env['LINKFLAGS']
            assert env['RPATH'] == ['rpath1', 'rpath2', 'rpath3'], env['RPATH']

            env.backtick = my_backtick([], "-Ibar")
            env.ParseConfig("fake2")
            assert env['CPPPATH'] == ['string', '/usr/include/fum', 'bar'], env['CPPPATH']
            env.ParseConfig("fake2", unique=0)
            assert env['CPPPATH'] == ['string', '/usr/include/fum', 'bar', 'bar'], env['CPPPATH']
        finally:
            env.backtick = orig_backtick

    def test_ParseDepends(self):
        """Test the ParseDepends() method"""
        test = TestCmd.TestCmd(workdir = '')

        test.write('single', """
#file: dependency

f0: \
   d1 \
   d2 \
   d3 \

""")

        test.write('multiple', """
f1: foo
f2 f3: bar
f4: abc def
#file: dependency
f5: \
   ghi \
   jkl \
   mno \
""")

        env = self.TestEnvironment(SINGLE = test.workpath('single'))

        tlist = []
        dlist = []
        def my_depends(target, dependency, tlist=tlist, dlist=dlist):
            tlist.extend(target)
            dlist.extend(dependency)

        env.Depends = my_depends

        env.ParseDepends(test.workpath('does_not_exist'))

        exc_caught = None
        try:
            env.ParseDepends(test.workpath('does_not_exist'), must_exist=1)
        except IOError:
            exc_caught = 1
        assert exc_caught, "did not catch expected IOError"

        del tlist[:]
        del dlist[:]

        env.ParseDepends('$SINGLE', only_one=1)
        t = list(map(str, tlist))
        d = list(map(str, dlist))
        assert t == ['f0'], t
        assert d == ['d1', 'd2', 'd3'], d

        del tlist[:]
        del dlist[:]

        env.ParseDepends(test.workpath('multiple'))
        t = list(map(str, tlist))
        d = list(map(str, dlist))
        assert t == ['f1', 'f2', 'f3', 'f4', 'f5'], t
        assert d == ['foo', 'bar', 'abc', 'def', 'ghi', 'jkl', 'mno'], d

        exc_caught = None
        try:
            env.ParseDepends(test.workpath('multiple'), only_one=1)
        except SCons.Errors.UserError:
            exc_caught = 1
        assert exc_caught, "did not catch expected UserError"

    def test_Platform(self):
        """Test the Platform() method"""
        env = self.TestEnvironment(WIN32='win32', NONE='no-such-platform')

        exc_caught = None
        try:
            env.Platform('does_not_exist')
        except SCons.Errors.UserError:
            exc_caught = 1
        assert exc_caught, "did not catch expected UserError"

        exc_caught = None
        try:
            env.Platform('$NONE')
        except SCons.Errors.UserError:
            exc_caught = 1
        assert exc_caught, "did not catch expected UserError"

        env.Platform('posix')
        assert env['OBJSUFFIX'] == '.o', env['OBJSUFFIX']

        env.Platform('$WIN32')
        assert env['OBJSUFFIX'] == '.obj', env['OBJSUFFIX']

    def test_Prepend(self):
        """Test prepending to construction variables in an Environment
        """
        cases = [
            'a1',       'A1',           'A1a1',
            'a2',       ['A2'],         ['A2', 'a2'],
            'a3',       UL(['A3']),     UL(['A3', 'a', '3']),
            'a4',       '',             'a4',
            'a5',       [],             ['a5'],
            'a6',       UL([]),         UL(['a', '6']),
            'a7',       [''],           ['', 'a7'],
            'a8',       UL(['']),       UL(['', 'a', '8']),

            ['e1'],     'E1',           ['E1', 'e1'],
            ['e2'],     ['E2'],         ['E2', 'e2'],
            ['e3'],     UL(['E3']),     UL(['E3', 'e3']),
            ['e4'],     '',             ['e4'],
            ['e5'],     [],             ['e5'],
            ['e6'],     UL([]),         UL(['e6']),
            ['e7'],     [''],           ['', 'e7'],
            ['e8'],     UL(['']),       UL(['', 'e8']),

            UL(['i1']), 'I1',           UL(['I', '1', 'i1']),
            UL(['i2']), ['I2'],         UL(['I2', 'i2']),
            UL(['i3']), UL(['I3']),     UL(['I3', 'i3']),
            UL(['i4']), '',             UL(['i4']),
            UL(['i5']), [],             UL(['i5']),
            UL(['i6']), UL([]),         UL(['i6']),
            UL(['i7']), [''],           UL(['', 'i7']),
            UL(['i8']), UL(['']),       UL(['', 'i8']),

            {'d1':1},   'D1',           {'d1':1, 'D1':None},
            {'d2':1},   ['D2'],         {'d2':1, 'D2':None},
            {'d3':1},   UL(['D3']),     {'d3':1, 'D3':None},
            {'d4':1},   {'D4':1},       {'d4':1, 'D4':1},
            {'d5':1},   UD({'D5':1}),   UD({'d5':1, 'D5':1}),

            UD({'u1':1}), 'U1',         UD({'u1':1, 'U1':None}),
            UD({'u2':1}), ['U2'],       UD({'u2':1, 'U2':None}),
            UD({'u3':1}), UL(['U3']),   UD({'u3':1, 'U3':None}),
            UD({'u4':1}), {'U4':1},     UD({'u4':1, 'U4':1}),
            UD({'u5':1}), UD({'U5':1}), UD({'u5':1, 'U5':1}),

            '',         'M1',           'M1',
            '',         ['M2'],         ['M2'],
            '',         UL(['M3']),     UL(['M3']),
            '',         '',             '',
            '',         [],             [],
            '',         UL([]),         UL([]),
            '',         [''],           [''],
            '',         UL(['']),       UL(['']),

            [],         'N1',           ['N1'],
            [],         ['N2'],         ['N2'],
            [],         UL(['N3']),     UL(['N3']),
            [],         '',             [],
            [],         [],             [],
            [],         UL([]),         UL([]),
            [],         [''],           [''],
            [],         UL(['']),       UL(['']),

            UL([]),     'O1',           UL(['O', '1']),
            UL([]),     ['O2'],         UL(['O2']),
            UL([]),     UL(['O3']),     UL(['O3']),
            UL([]),     '',             UL([]),
            UL([]),     [],             UL([]),
            UL([]),     UL([]),         UL([]),
            UL([]),     [''],           UL(['']),
            UL([]),     UL(['']),       UL(['']),

            [''],       'P1',           ['P1', ''],
            [''],       ['P2'],         ['P2', ''],
            [''],       UL(['P3']),     UL(['P3', '']),
            [''],       '',             [''],
            [''],       [],             [''],
            [''],       UL([]),         UL(['']),
            [''],       [''],           ['', ''],
            [''],       UL(['']),       UL(['', '']),

            UL(['']),   'Q1',           UL(['Q', '1', '']),
            UL(['']),   ['Q2'],         UL(['Q2', '']),
            UL(['']),   UL(['Q3']),     UL(['Q3', '']),
            UL(['']),   '',             UL(['']),
            UL(['']),   [],             UL(['']),
            UL(['']),   UL([]),         UL(['']),
            UL(['']),   [''],           UL(['', '']),
            UL(['']),   UL(['']),       UL(['', '']),
        ]

        env = Environment()
        failed = 0
        while cases:
            input, prepend, expect = cases[:3]
            env['XXX'] = copy.copy(input)
            try:
                env.Prepend(XXX = prepend)
            except Exception as e:
                if failed == 0: print()
                print("    %s Prepend %s exception: %s" % \
                      (repr(input), repr(prepend), e))
                failed = failed + 1
            else:
                result = env['XXX']
                if result != expect:
                    if failed == 0: print()
                    print("    %s Prepend %s => %s did not match %s" % \
                          (repr(input), repr(prepend), repr(result), repr(expect)))
                    failed = failed + 1
            del cases[:3]
        assert failed == 0, "%d Prepend() cases failed" % failed

        env['UL'] = UL(['foo'])
        env.Prepend(UL = 'bar')
        result = env['UL']
        assert isinstance(result, UL), repr(result)
        assert result == ['b', 'a', 'r', 'foo'], result

        env['CLVar'] = CLVar(['foo'])
        env.Prepend(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['bar', 'foo'], result

        env3 = self.TestEnvironment(X = {'x1' : 7})
        env3.Prepend(X = {'x1' : 8, 'x2' : 9}, Y = {'y1' : 10})
        assert env3['X'] == {'x1': 8, 'x2' : 9}, env3['X']
        assert env3['Y'] == {'y1': 10}, env3['Y']

        z1 = Builder()
        z2 = Builder()
        env4 = self.TestEnvironment(BUILDERS = {'z1' : z1})
        env4.Prepend(BUILDERS = {'z2' : z2})
        assert env4['BUILDERS'] == {'z1' : z1, 'z2' : z2}, env4['BUILDERS']
        assert hasattr(env4, 'z1')
        assert hasattr(env4, 'z2')

    def test_PrependENVPath(self):
        """Test prepending to an ENV path."""
        env1 = self.TestEnvironment(ENV = {'PATH': r'C:\dir\num\one;C:\dir\num\two'},
                           MYENV = {'MYPATH': r'C:\mydir\num\one;C:\mydir\num\two'})
        # have to include the pathsep here so that the test will work on UNIX too.
        env1.PrependENVPath('PATH',r'C:\dir\num\two',sep = ';')
        env1.PrependENVPath('PATH',r'C:\dir\num\three',sep = ';')
        env1.PrependENVPath('MYPATH',r'C:\mydir\num\three','MYENV',sep = ';')
        env1.PrependENVPath('MYPATH',r'C:\mydir\num\one','MYENV',sep = ';')
        # this should do nothing since delete_existing is 0
        env1.PrependENVPath('MYPATH',r'C:\mydir\num\three','MYENV', sep = ';', delete_existing=0)
        assert(env1['ENV']['PATH'] == r'C:\dir\num\three;C:\dir\num\two;C:\dir\num\one')
        assert(env1['MYENV']['MYPATH'] == r'C:\mydir\num\one;C:\mydir\num\three;C:\mydir\num\two')

        test = TestCmd.TestCmd(workdir = '')
        test.subdir('sub1', 'sub2')
        p=env1['ENV']['PATH']
        env1.PrependENVPath('PATH','#sub1', sep = ';')
        env1.PrependENVPath('PATH',env1.fs.Dir('sub2'), sep = ';')
        assert env1['ENV']['PATH'] == 'sub2;sub1;' + p, env1['ENV']['PATH']

    def test_PrependUnique(self):
        """Test prepending unique values to construction variables

        This strips values that are already present when lists are
        involved."""
        env = self.TestEnvironment(AAA1 = 'a1',
                          AAA2 = 'a2',
                          AAA3 = 'a3',
                          AAA4 = 'a4',
                          AAA5 = 'a5',
                          BBB1 = ['b1'],
                          BBB2 = ['b2'],
                          BBB3 = ['b3'],
                          BBB4 = ['b4'],
                          BBB5 = ['b5'],
                          CCC1 = '',
                          CCC2 = '',
                          DDD1 = ['a', 'b', 'c'])
        env.PrependUnique(AAA1 = 'a1',
                          AAA2 = ['a2'],
                          AAA3 = ['a3', 'b', 'c', 'b', 'a3'], # ignore dups
                          AAA4 = 'a4.new',
                          AAA5 = ['a5.new'],
                          BBB1 = 'b1',
                          BBB2 = ['b2'],
                          BBB3 = ['b3', 'b', 'c', 'b3'],
                          BBB4 = 'b4.new',
                          BBB5 = ['b5.new'],
                          CCC1 = 'c1',
                          CCC2 = ['c2'],
                          DDD1 = 'b')
        assert env['AAA1'] == 'a1a1', env['AAA1']
        assert env['AAA2'] == ['a2'], env['AAA2']
        assert env['AAA3'] == ['c', 'b', 'a3'], env['AAA3']
        assert env['AAA4'] == 'a4.newa4', env['AAA4']
        assert env['AAA5'] == ['a5.new', 'a5'], env['AAA5']
        assert env['BBB1'] == ['b1'], env['BBB1']
        assert env['BBB2'] == ['b2'], env['BBB2']
        assert env['BBB3'] == ['b', 'c', 'b3'], env['BBB3']
        assert env['BBB4'] == ['b4.new', 'b4'], env['BBB4']
        assert env['BBB5'] == ['b5.new', 'b5'], env['BBB5']
        assert env['CCC1'] == 'c1', env['CCC1']
        assert env['CCC2'] == ['c2'], env['CCC2']
        assert env['DDD1'] == ['a', 'b', 'c'], env['DDD1']

        env.PrependUnique(DDD1 = 'b', delete_existing=1)
        assert env['DDD1'] == ['b', 'a', 'c'], env['DDD1'] # b moves to front
        env.PrependUnique(DDD1 = ['a','c'], delete_existing=1)
        assert env['DDD1'] == ['a', 'c', 'b'], env['DDD1'] # a & c move to front
        env.PrependUnique(DDD1 = ['d','e','d'], delete_existing=1)
        assert env['DDD1'] == ['d', 'e', 'a', 'c', 'b'], env['DDD1']


        env['CLVar'] = CLVar([])
        env.PrependUnique(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['bar'], result

        env['CLVar'] = CLVar(['abc'])
        env.PrependUnique(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['bar', 'abc'], result

        env['CLVar'] = CLVar(['bar'])
        env.PrependUnique(CLVar = 'bar')
        result = env['CLVar']
        assert isinstance(result, CLVar), repr(result)
        assert result == ['bar'], result

    def test_Replace(self):
        """Test replacing construction variables in an Environment

        After creation of the Environment, of course.
        """
        env1 = self.TestEnvironment(AAA = 'a', BBB = 'b')
        env1.Replace(BBB = 'bbb', CCC = 'ccc')

        env2 = self.TestEnvironment(AAA = 'a', BBB = 'bbb', CCC = 'ccc')
        assert env1 == env2, diff_env(env1, env2)

        b1 = Builder()
        b2 = Builder()
        env3 = self.TestEnvironment(BUILDERS = {'b1' : b1})
        assert hasattr(env3, 'b1'), "b1 was not set"
        env3.Replace(BUILDERS = {'b2' : b2})
        assert not hasattr(env3, 'b1'), "b1 was not cleared"
        assert hasattr(env3, 'b2'), "b2 was not set"

    def test_ReplaceIxes(self):
        "Test ReplaceIxes()"
        env = self.TestEnvironment(LIBPREFIX='lib',
                          LIBSUFFIX='.a',
                          SHLIBPREFIX='lib',
                          SHLIBSUFFIX='.so',
                          PREFIX='pre',
                          SUFFIX='post')

        assert 'libfoo.a' == env.ReplaceIxes('libfoo.so',
                                             'SHLIBPREFIX', 'SHLIBSUFFIX',
                                             'LIBPREFIX', 'LIBSUFFIX')

        assert os.path.join('dir', 'libfoo.a') == env.ReplaceIxes(os.path.join('dir', 'libfoo.so'),
                                                                   'SHLIBPREFIX', 'SHLIBSUFFIX',
                                                                   'LIBPREFIX', 'LIBSUFFIX')

        assert 'libfoo.a' == env.ReplaceIxes('prefoopost',
                                             'PREFIX', 'SUFFIX',
                                             'LIBPREFIX', 'LIBSUFFIX')

    def test_SetDefault(self):
        """Test the SetDefault method"""
        env = self.TestEnvironment(tools = [])
        env.SetDefault(V1 = 1)
        env.SetDefault(V1 = 2)
        assert env['V1'] == 1
        env['V2'] = 2
        env.SetDefault(V2 = 1)
        assert env['V2'] == 2

    def test_Tool(self):
        """Test the Tool() method"""
        env = self.TestEnvironment(LINK='link', NONE='no-such-tool')

        exc_caught = None
        try:
            env.Tool('does_not_exist')
        except SCons.Errors.EnvironmentError:
            exc_caught = 1
        assert exc_caught, "did not catch expected EnvironmentError"

        exc_caught = None
        try:
            env.Tool('$NONE')
        except SCons.Errors.EnvironmentError:
            exc_caught = 1
        assert exc_caught, "did not catch expected EnvironmentError"

        # Use a non-existent toolpath directory just to make sure we
        # can call Tool() with the keyword argument.
        env.Tool('cc', toolpath=['/no/such/directory'])
        assert env['CC'] == 'cc', env['CC']

        env.Tool('$LINK')
        assert env['LINK'] == '$SMARTLINK', env['LINK']

        # Test that the environment stores the toolpath and
        # re-uses it for later calls.
        test = TestCmd.TestCmd(workdir = '')

        test.write('xxx.py', """\
def exists(env):
    1
def generate(env):
    env['XXX'] = 'one'
""")

        test.write('yyy.py', """\
def exists(env):
    1
def generate(env):
    env['YYY'] = 'two'
""")

        env = self.TestEnvironment(tools=['xxx'], toolpath=[test.workpath('')])
        assert env['XXX'] == 'one', env['XXX']
        env.Tool('yyy')
        assert env['YYY'] == 'two', env['YYY']

    def test_WhereIs(self):
        """Test the WhereIs() method"""
        test = TestCmd.TestCmd(workdir = '')

        sub1_xxx_exe = test.workpath('sub1', 'xxx.exe')
        sub2_xxx_exe = test.workpath('sub2', 'xxx.exe')
        sub3_xxx_exe = test.workpath('sub3', 'xxx.exe')
        sub4_xxx_exe = test.workpath('sub4', 'xxx.exe')

        test.subdir('subdir', 'sub1', 'sub2', 'sub3', 'sub4')

        if sys.platform != 'win32':
            test.write(sub1_xxx_exe, "\n")

        os.mkdir(sub2_xxx_exe)

        test.write(sub3_xxx_exe, "\n")
        os.chmod(sub3_xxx_exe, 0o777)

        test.write(sub4_xxx_exe, "\n")
        os.chmod(sub4_xxx_exe, 0o777)

        env_path = os.environ['PATH']

        pathdirs_1234 = [ test.workpath('sub1'),
                          test.workpath('sub2'),
                          test.workpath('sub3'),
                          test.workpath('sub4'),
                        ] + env_path.split(os.pathsep)

        pathdirs_1243 = [ test.workpath('sub1'),
                          test.workpath('sub2'),
                          test.workpath('sub4'),
                          test.workpath('sub3'),
                        ] + env_path.split(os.pathsep)

        path = os.pathsep.join(pathdirs_1234)
        env = self.TestEnvironment(ENV = {'PATH' : path})
        wi = env.WhereIs('xxx.exe')
        assert wi == test.workpath(sub3_xxx_exe), wi
        wi = env.WhereIs('xxx.exe', pathdirs_1243)
        assert wi == test.workpath(sub4_xxx_exe), wi
        wi = env.WhereIs('xxx.exe', os.pathsep.join(pathdirs_1243))
        assert wi == test.workpath(sub4_xxx_exe), wi

        wi = env.WhereIs('xxx.exe', reject = sub3_xxx_exe)
        assert wi == test.workpath(sub4_xxx_exe), wi
        wi = env.WhereIs('xxx.exe', pathdirs_1243, reject = sub3_xxx_exe)
        assert wi == test.workpath(sub4_xxx_exe), wi

        path = os.pathsep.join(pathdirs_1243)
        env = self.TestEnvironment(ENV = {'PATH' : path})
        wi = env.WhereIs('xxx.exe')
        assert wi == test.workpath(sub4_xxx_exe), wi
        wi = env.WhereIs('xxx.exe', pathdirs_1234)
        assert wi == test.workpath(sub3_xxx_exe), wi
        wi = env.WhereIs('xxx.exe', os.pathsep.join(pathdirs_1234))
        assert wi == test.workpath(sub3_xxx_exe), wi

        if sys.platform == 'win32':
            wi = env.WhereIs('xxx', pathext = '')
            assert wi is None, wi

            wi = env.WhereIs('xxx', pathext = '.exe')
            assert wi == test.workpath(sub4_xxx_exe), wi

            wi = env.WhereIs('xxx', path = pathdirs_1234, pathext = '.BAT;.EXE')
            assert wi.lower() == test.workpath(sub3_xxx_exe).lower(), wi

            # Test that we return a normalized path even when
            # the path contains forward slashes.
            forward_slash = test.workpath('') + '/sub3'
            wi = env.WhereIs('xxx', path = forward_slash, pathext = '.EXE')
            assert wi.lower() == test.workpath(sub3_xxx_exe).lower(), wi



    def test_Action(self):
        """Test the Action() method"""
        import SCons.Action

        env = self.TestEnvironment(FOO = 'xyzzy')

        a = env.Action('foo')
        assert a, a
        assert a.__class__ is SCons.Action.CommandAction, a.__class__

        a = env.Action('$FOO')
        assert a, a
        assert a.__class__ is SCons.Action.CommandAction, a.__class__

        a = env.Action('$$FOO')
        assert a, a
        assert a.__class__ is SCons.Action.LazyAction, a.__class__

        a = env.Action(['$FOO', 'foo'])
        assert a, a
        assert a.__class__ is SCons.Action.ListAction, a.__class__

        def func(arg):
            pass
        a = env.Action(func)
        assert a, a
        assert a.__class__ is SCons.Action.FunctionAction, a.__class__

    def test_AddPostAction(self):
        """Test the AddPostAction() method"""
        env = self.TestEnvironment(FOO='fff', BAR='bbb')

        n = env.AddPostAction('$FOO', lambda x: x)
        assert str(n[0]) == 'fff', n[0]

        n = env.AddPostAction(['ggg', '$BAR'], lambda x: x)
        assert str(n[0]) == 'ggg', n[0]
        assert str(n[1]) == 'bbb', n[1]

    def test_AddPreAction(self):
        """Test the AddPreAction() method"""
        env = self.TestEnvironment(FOO='fff', BAR='bbb')

        n = env.AddPreAction('$FOO', lambda x: x)
        assert str(n[0]) == 'fff', n[0]

        n = env.AddPreAction(['ggg', '$BAR'], lambda x: x)
        assert str(n[0]) == 'ggg', n[0]
        assert str(n[1]) == 'bbb', n[1]

    def test_Alias(self):
        """Test the Alias() method"""
        env = self.TestEnvironment(FOO='kkk', BAR='lll', EA='export_alias')

        tgt = env.Alias('new_alias')[0]
        assert str(tgt) == 'new_alias', tgt
        assert tgt.sources == [], tgt.sources
        assert not hasattr(tgt, 'builder'), tgt.builder

        tgt = env.Alias('None_alias', None)[0]
        assert str(tgt) == 'None_alias', tgt
        assert tgt.sources == [], tgt.sources

        tgt = env.Alias('empty_list', [])[0]
        assert str(tgt) == 'empty_list', tgt
        assert tgt.sources == [], tgt.sources

        tgt = env.Alias('export_alias', [ 'asrc1', '$FOO' ])[0]
        assert str(tgt) == 'export_alias', tgt
        assert len(tgt.sources) == 2, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'asrc1', list(map(str, tgt.sources))
        assert str(tgt.sources[1]) == 'kkk', list(map(str, tgt.sources))

        n = env.Alias(tgt, source = ['$BAR', 'asrc4'])[0]
        assert n is tgt, n
        assert len(tgt.sources) == 4, list(map(str, tgt.sources))
        assert str(tgt.sources[2]) == 'lll', list(map(str, tgt.sources))
        assert str(tgt.sources[3]) == 'asrc4', list(map(str, tgt.sources))

        n = env.Alias('$EA', 'asrc5')[0]
        assert n is tgt, n
        assert len(tgt.sources) == 5, list(map(str, tgt.sources))
        assert str(tgt.sources[4]) == 'asrc5', list(map(str, tgt.sources))

        t1, t2 = env.Alias(['t1', 't2'], ['asrc6', 'asrc7'])
        assert str(t1) == 't1', t1
        assert str(t2) == 't2', t2
        assert len(t1.sources) == 2, list(map(str, t1.sources))
        assert str(t1.sources[0]) == 'asrc6', list(map(str, t1.sources))
        assert str(t1.sources[1]) == 'asrc7', list(map(str, t1.sources))
        assert len(t2.sources) == 2, list(map(str, t2.sources))
        assert str(t2.sources[0]) == 'asrc6', list(map(str, t2.sources))
        assert str(t2.sources[1]) == 'asrc7', list(map(str, t2.sources))

        tgt = env.Alias('add', 's1')
        tgt = env.Alias('add', 's2')[0]
        s = list(map(str, tgt.sources))
        assert s == ['s1', 's2'], s
        tgt = env.Alias(tgt, 's3')[0]
        s = list(map(str, tgt.sources))
        assert s == ['s1', 's2', 's3'], s

        tgt = env.Alias('act', None, "action1")[0]
        s = str(tgt.builder.action)
        assert s == "action1", s
        tgt = env.Alias('act', None, "action2")[0]
        s = str(tgt.builder.action)
        assert s == "action1\naction2", s
        tgt = env.Alias(tgt, None, "action3")[0]
        s = str(tgt.builder.action)
        assert s == "action1\naction2\naction3", s

    def test_AlwaysBuild(self):
        """Test the AlwaysBuild() method"""
        env = self.TestEnvironment(FOO='fff', BAR='bbb')
        t = env.AlwaysBuild('a', 'b$FOO', ['c', 'd'], '$BAR',
                            env.fs.Dir('dir'), env.fs.File('file'))
        assert t[0].__class__.__name__ == 'Entry'
        assert t[0].get_internal_path() == 'a'
        assert t[0].always_build
        assert t[1].__class__.__name__ == 'Entry'
        assert t[1].get_internal_path() == 'bfff'
        assert t[1].always_build
        assert t[2].__class__.__name__ == 'Entry'
        assert t[2].get_internal_path() == 'c'
        assert t[2].always_build
        assert t[3].__class__.__name__ == 'Entry'
        assert t[3].get_internal_path() == 'd'
        assert t[3].always_build
        assert t[4].__class__.__name__ == 'Entry'
        assert t[4].get_internal_path() == 'bbb'
        assert t[4].always_build
        assert t[5].__class__.__name__ == 'Dir'
        assert t[5].get_internal_path() == 'dir'
        assert t[5].always_build
        assert t[6].__class__.__name__ == 'File'
        assert t[6].get_internal_path() == 'file'
        assert t[6].always_build

    def test_VariantDir(self):
        """Test the VariantDir() method"""
        class MyFS(object):
             def Dir(self, name):
                 return name
             def VariantDir(self, variant_dir, src_dir, duplicate):
                 self.variant_dir = variant_dir
                 self.src_dir = src_dir
                 self.duplicate = duplicate

        env = self.TestEnvironment(FOO = 'fff', BAR = 'bbb')
        env.fs = MyFS()

        env.VariantDir('build', 'src')
        assert env.fs.variant_dir == 'build', env.fs.variant_dir
        assert env.fs.src_dir == 'src', env.fs.src_dir
        assert env.fs.duplicate == 1, env.fs.duplicate

        env.VariantDir('build${FOO}', '${BAR}src', 0)
        assert env.fs.variant_dir == 'buildfff', env.fs.variant_dir
        assert env.fs.src_dir == 'bbbsrc', env.fs.src_dir
        assert env.fs.duplicate == 0, env.fs.duplicate

    def test_Builder(self):
        """Test the Builder() method"""
        env = self.TestEnvironment(FOO = 'xyzzy')

        b = env.Builder(action = 'foo')
        assert b is not None, b

        b = env.Builder(action = '$FOO')
        assert b is not None, b

        b = env.Builder(action = ['$FOO', 'foo'])
        assert b is not None, b

        def func(arg):
            pass
        b = env.Builder(action = func)
        assert b is not None, b
        b = env.Builder(generator = func)
        assert b is not None, b

    def test_CacheDir(self):
        """Test the CacheDir() method"""
        env = self.TestEnvironment(CD = 'CacheDir')

        env.CacheDir('foo')
        assert env._CacheDir_path == 'foo', env._CacheDir_path

        env.CacheDir('$CD')
        assert env._CacheDir_path == 'CacheDir', env._CacheDir_path

    def test_Clean(self):
        """Test the Clean() method"""
        env = self.TestEnvironment(FOO = 'fff', BAR = 'bbb')

        CT = SCons.Environment.CleanTargets

        foo = env.arg2nodes('foo')[0]
        fff = env.arg2nodes('fff')[0]

        t = env.Clean('foo', 'aaa')
        l = list(map(str, CT[foo]))
        assert l == ['aaa'], l

        t = env.Clean(foo, ['$BAR', 'ccc'])
        l = list(map(str, CT[foo]))
        assert l == ['aaa', 'bbb', 'ccc'], l

        eee = env.arg2nodes('eee')[0]

        t = env.Clean('$FOO', 'ddd')
        l = list(map(str, CT[fff]))
        assert l == ['ddd'], l
        t = env.Clean(fff, [eee, 'fff'])
        l = list(map(str, CT[fff]))
        assert l == ['ddd', 'eee', 'fff'], l

    def test_Command(self):
        """Test the Command() method."""
        env = Environment()
        t = env.Command(target='foo.out', source=['foo1.in', 'foo2.in'],
                        action='buildfoo $target $source')[0]
        assert t.builder is not None
        assert t.builder.action.__class__.__name__ == 'CommandAction'
        assert t.builder.action.cmd_list == 'buildfoo $target $source'
        assert 'foo1.in' in [x.get_internal_path() for x in t.sources]
        assert 'foo2.in' in [x.get_internal_path() for x in t.sources]

        sub = env.fs.Dir('sub')
        t = env.Command(target='bar.out', source='sub',
                        action='buildbar $target $source')[0]
        assert 'sub' in [x.get_internal_path() for x in t.sources]

        def testFunc(env, target, source):
            assert str(target[0]) == 'foo.out'
            assert 'foo1.in' in list(map(str, source)) and 'foo2.in' in list(map(str, source)), list(map(str, source))
            return 0
        t = env.Command(target='foo.out', source=['foo1.in','foo2.in'],
                        action=testFunc)[0]
        assert t.builder is not None
        assert t.builder.action.__class__.__name__ == 'FunctionAction'
        t.build()
        assert 'foo1.in' in [x.get_internal_path() for x in t.sources]
        assert 'foo2.in' in [x.get_internal_path() for x in t.sources]

        x = []
        def test2(baz, x=x):
            x.append(baz)
        env = self.TestEnvironment(TEST2 = test2)
        t = env.Command(target='baz.out', source='baz.in',
                        action='${TEST2(XYZ)}',
                        XYZ='magic word')[0]
        assert t.builder is not None
        t.build()
        assert x[0] == 'magic word', x

        t = env.Command(target='${X}.out', source='${X}.in',
                        action = 'foo',
                        X = 'xxx')[0]
        assert str(t) == 'xxx.out', str(t)
        assert 'xxx.in' in [x.get_internal_path() for x in t.sources]

        env = self.TestEnvironment(source_scanner = 'should_not_find_this')
        t = env.Command(target='file.out', source='file.in',
                        action = 'foo',
                        source_scanner = 'fake')[0]
        assert t.builder.source_scanner == 'fake', t.builder.source_scanner

    def test_Configure(self):
        """Test the Configure() method"""
        # Configure() will write to a local temporary file.
        test = TestCmd.TestCmd(workdir = '')
        save = os.getcwd()

        try:
            os.chdir(test.workpath())

            env = self.TestEnvironment(FOO = 'xyzzy')

            def func(arg):
                pass

            c = env.Configure()
            assert c is not None, c
            c.Finish()

            c = env.Configure(custom_tests = {'foo' : func, '$FOO' : func})
            assert c is not None, c
            assert hasattr(c, 'foo')
            assert hasattr(c, 'xyzzy')
            c.Finish()
        finally:
            os.chdir(save)

    def test_Depends(self):
        """Test the explicit Depends method."""
        env = self.TestEnvironment(FOO = 'xxx', BAR='yyy')
        env.Dir('dir1')
        env.Dir('dir2')
        env.File('xxx.py')
        env.File('yyy.py')
        t = env.Depends(target='EnvironmentTest.py',
                        dependency='Environment.py')[0]
        assert t.__class__.__name__ == 'Entry', t.__class__.__name__
        assert t.get_internal_path() == 'EnvironmentTest.py'
        assert len(t.depends) == 1
        d = t.depends[0]
        assert d.__class__.__name__ == 'Entry', d.__class__.__name__
        assert d.get_internal_path() == 'Environment.py'

        t = env.Depends(target='${FOO}.py', dependency='${BAR}.py')[0]
        assert t.__class__.__name__ == 'File', t.__class__.__name__
        assert t.get_internal_path() == 'xxx.py'
        assert len(t.depends) == 1
        d = t.depends[0]
        assert d.__class__.__name__ == 'File', d.__class__.__name__
        assert d.get_internal_path() == 'yyy.py'

        t = env.Depends(target='dir1', dependency='dir2')[0]
        assert t.__class__.__name__ == 'Dir', t.__class__.__name__
        assert t.get_internal_path() == 'dir1'
        assert len(t.depends) == 1
        d = t.depends[0]
        assert d.__class__.__name__ == 'Dir', d.__class__.__name__
        assert d.get_internal_path() == 'dir2'

    def test_Dir(self):
        """Test the Dir() method"""
        class MyFS(object):
            def Dir(self, name):
                return 'Dir(%s)' % name

        env = self.TestEnvironment(FOO = 'foodir', BAR = 'bardir')
        env.fs = MyFS()

        d = env.Dir('d')
        assert d == 'Dir(d)', d

        d = env.Dir('$FOO')
        assert d == 'Dir(foodir)', d

        d = env.Dir('${BAR}_$BAR')
        assert d == 'Dir(bardir_bardir)', d

        d = env.Dir(['dir1'])
        assert d == ['Dir(dir1)'], d

        d = env.Dir(['dir1', 'dir2'])
        assert d == ['Dir(dir1)', 'Dir(dir2)'], d

    def test_NoClean(self):
        """Test the NoClean() method"""
        env = self.TestEnvironment(FOO='ggg', BAR='hhh')
        env.Dir('p_hhhb')
        env.File('p_d')
        t = env.NoClean('p_a', 'p_${BAR}b', ['p_c', 'p_d'], 'p_$FOO')

        assert t[0].__class__.__name__ == 'Entry', t[0].__class__.__name__
        assert t[0].get_internal_path() == 'p_a'
        assert t[0].noclean
        assert t[1].__class__.__name__ == 'Dir', t[1].__class__.__name__
        assert t[1].get_internal_path() == 'p_hhhb'
        assert t[1].noclean
        assert t[2].__class__.__name__ == 'Entry', t[2].__class__.__name__
        assert t[2].get_internal_path() == 'p_c'
        assert t[2].noclean
        assert t[3].__class__.__name__ == 'File', t[3].__class__.__name__
        assert t[3].get_internal_path() == 'p_d'
        assert t[3].noclean
        assert t[4].__class__.__name__ == 'Entry', t[4].__class__.__name__
        assert t[4].get_internal_path() == 'p_ggg'
        assert t[4].noclean

    def test_Dump(self):
        """Test the Dump() method"""

        env = self.TestEnvironment(FOO = 'foo')
        assert env.Dump('FOO') == "'foo'", env.Dump('FOO')
        assert len(env.Dump()) > 200, env.Dump()    # no args version

    def test_Environment(self):
        """Test the Environment() method"""
        env = self.TestEnvironment(FOO = 'xxx', BAR = 'yyy')

        e2 = env.Environment(X = '$FOO', Y = '$BAR')
        assert e2['X'] == 'xxx', e2['X']
        assert e2['Y'] == 'yyy', e2['Y']

    def test_Execute(self):
        """Test the Execute() method"""

        class MyAction(object):
            def __init__(self, *args, **kw):
                self.args = args
            def __call__(self, target, source, env):
                return "%s executed" % self.args

        env = Environment()
        env.Action = MyAction

        result = env.Execute("foo")
        assert result == "foo executed", result

    def test_Entry(self):
        """Test the Entry() method"""
        class MyFS(object):
            def Entry(self, name):
                return 'Entry(%s)' % name

        env = self.TestEnvironment(FOO = 'fooentry', BAR = 'barentry')
        env.fs = MyFS()

        e = env.Entry('e')
        assert e == 'Entry(e)', e

        e = env.Entry('$FOO')
        assert e == 'Entry(fooentry)', e

        e = env.Entry('${BAR}_$BAR')
        assert e == 'Entry(barentry_barentry)', e

        e = env.Entry(['entry1'])
        assert e == ['Entry(entry1)'], e

        e = env.Entry(['entry1', 'entry2'])
        assert e == ['Entry(entry1)', 'Entry(entry2)'], e

    def test_File(self):
        """Test the File() method"""
        class MyFS(object):
            def File(self, name):
                return 'File(%s)' % name

        env = self.TestEnvironment(FOO = 'foofile', BAR = 'barfile')
        env.fs = MyFS()

        f = env.File('f')
        assert f == 'File(f)', f

        f = env.File('$FOO')
        assert f == 'File(foofile)', f

        f = env.File('${BAR}_$BAR')
        assert f == 'File(barfile_barfile)', f

        f = env.File(['file1'])
        assert f == ['File(file1)'], f

        f = env.File(['file1', 'file2'])
        assert f == ['File(file1)', 'File(file2)'], f

    def test_FindFile(self):
        """Test the FindFile() method"""
        env = self.TestEnvironment(FOO = 'fff', BAR = 'bbb')

        r = env.FindFile('foo', ['no_such_directory'])
        assert r is None, r

        # XXX

    def test_Flatten(self):
        """Test the Flatten() method"""
        env = Environment()
        l = env.Flatten([1])
        assert l == [1]
        l = env.Flatten([1, [2, [3, [4]]]])
        assert l == [1, 2, 3, 4], l

    def test_GetBuildPath(self):
        """Test the GetBuildPath() method."""
        env = self.TestEnvironment(MAGIC = 'xyzzy')

        p = env.GetBuildPath('foo')
        assert p == 'foo', p

        p = env.GetBuildPath('$MAGIC')
        assert p == 'xyzzy', p

    def test_Ignore(self):
        """Test the explicit Ignore method."""
        env = self.TestEnvironment(FOO='yyy', BAR='zzz')
        env.Dir('dir1')
        env.Dir('dir2')
        env.File('yyyzzz')
        env.File('zzzyyy')

        t = env.Ignore(target='targ.py', dependency='dep.py')[0]
        assert t.__class__.__name__ == 'Entry', t.__class__.__name__
        assert t.get_internal_path() == 'targ.py'
        assert len(t.ignore) == 1
        i = t.ignore[0]
        assert i.__class__.__name__ == 'Entry', i.__class__.__name__
        assert i.get_internal_path() == 'dep.py'

        t = env.Ignore(target='$FOO$BAR', dependency='$BAR$FOO')[0]
        assert t.__class__.__name__ == 'File', t.__class__.__name__
        assert t.get_internal_path() == 'yyyzzz'
        assert len(t.ignore) == 1
        i = t.ignore[0]
        assert i.__class__.__name__ == 'File', i.__class__.__name__
        assert i.get_internal_path() == 'zzzyyy'

        t = env.Ignore(target='dir1', dependency='dir2')[0]
        assert t.__class__.__name__ == 'Dir', t.__class__.__name__
        assert t.get_internal_path() == 'dir1'
        assert len(t.ignore) == 1
        i = t.ignore[0]
        assert i.__class__.__name__ == 'Dir', i.__class__.__name__
        assert i.get_internal_path() == 'dir2'

    def test_Literal(self):
        """Test the Literal() method"""
        env = self.TestEnvironment(FOO='fff', BAR='bbb')
        list = env.subst_list([env.Literal('$FOO'), '$BAR'])[0]
        assert list == ['$FOO', 'bbb'], list
        list = env.subst_list(['$FOO', env.Literal('$BAR')])[0]
        assert list == ['fff', '$BAR'], list

    def test_Local(self):
        """Test the Local() method."""
        env = self.TestEnvironment(FOO='lll')

        l = env.Local(env.fs.File('fff'))
        assert str(l[0]) == 'fff', l[0]

        l = env.Local('ggg', '$FOO')
        assert str(l[0]) == 'ggg', l[0]
        assert str(l[1]) == 'lll', l[1]

    def test_Precious(self):
        """Test the Precious() method"""
        env = self.TestEnvironment(FOO='ggg', BAR='hhh')
        env.Dir('p_hhhb')
        env.File('p_d')
        t = env.Precious('p_a', 'p_${BAR}b', ['p_c', 'p_d'], 'p_$FOO')

        assert t[0].__class__.__name__ == 'Entry', t[0].__class__.__name__
        assert t[0].get_internal_path() == 'p_a'
        assert t[0].precious
        assert t[1].__class__.__name__ == 'Dir', t[1].__class__.__name__
        assert t[1].get_internal_path() == 'p_hhhb'
        assert t[1].precious
        assert t[2].__class__.__name__ == 'Entry', t[2].__class__.__name__
        assert t[2].get_internal_path() == 'p_c'
        assert t[2].precious
        assert t[3].__class__.__name__ == 'File', t[3].__class__.__name__
        assert t[3].get_internal_path() == 'p_d'
        assert t[3].precious
        assert t[4].__class__.__name__ == 'Entry', t[4].__class__.__name__
        assert t[4].get_internal_path() == 'p_ggg'
        assert t[4].precious

    def test_Pseudo(self):
        """Test the Pseudo() method"""
        env = self.TestEnvironment(FOO='ggg', BAR='hhh')
        env.Dir('p_hhhb')
        env.File('p_d')
        t = env.Pseudo('p_a', 'p_${BAR}b', ['p_c', 'p_d'], 'p_$FOO')

        assert t[0].__class__.__name__ == 'Entry', t[0].__class__.__name__
        assert t[0].get_internal_path() == 'p_a'
        assert t[0].pseudo
        assert t[1].__class__.__name__ == 'Dir', t[1].__class__.__name__
        assert t[1].get_internal_path() == 'p_hhhb'
        assert t[1].pseudo
        assert t[2].__class__.__name__ == 'Entry', t[2].__class__.__name__
        assert t[2].get_internal_path() == 'p_c'
        assert t[2].pseudo
        assert t[3].__class__.__name__ == 'File', t[3].__class__.__name__
        assert t[3].get_internal_path() == 'p_d'
        assert t[3].pseudo
        assert t[4].__class__.__name__ == 'Entry', t[4].__class__.__name__
        assert t[4].get_internal_path() == 'p_ggg'
        assert t[4].pseudo

    def test_Repository(self):
        """Test the Repository() method."""
        class MyFS(object):
            def __init__(self):
                self.list = []
            def Repository(self, *dirs):
                self.list.extend(list(dirs))
            def Dir(self, name):
                return name
        env = self.TestEnvironment(FOO='rrr', BAR='sss')
        env.fs = MyFS()
        env.Repository('/tmp/foo')
        env.Repository('/tmp/$FOO', '/tmp/$BAR/foo')
        expect = ['/tmp/foo', '/tmp/rrr', '/tmp/sss/foo']
        assert env.fs.list == expect, env.fs.list

    def test_Scanner(self):
        """Test the Scanner() method"""
        def scan(node, env, target, arg):
            pass

        env = self.TestEnvironment(FOO = scan)

        s = env.Scanner('foo')
        assert s is not None, s

        s = env.Scanner(function = 'foo')
        assert s is not None, s

        if 0:
            s = env.Scanner('$FOO')
            assert s is not None, s

            s = env.Scanner(function = '$FOO')
            assert s is not None, s

    def test_SConsignFile(self):
        """Test the SConsignFile() method"""
        import SCons.SConsign

        class MyFS(object):
            SConstruct_dir = os.sep + 'dir'

        env = self.TestEnvironment(FOO = 'SConsign',
                          BAR = os.path.join(os.sep, 'File'))
        env.fs = MyFS()
        env.Execute = lambda action: None

        try:
            fnames = []
            dbms = []
            def capture(name, dbm_module, fnames=fnames, dbms=dbms):
                fnames.append(name)
                dbms.append(dbm_module)

            save_SConsign_File = SCons.SConsign.File
            SCons.SConsign.File = capture

            env.SConsignFile('foo')
            assert fnames[-1] == os.path.join(os.sep, 'dir', 'foo'), fnames
            assert dbms[-1] is None, dbms

            env.SConsignFile('$FOO')
            assert fnames[-1] == os.path.join(os.sep, 'dir', 'SConsign'), fnames
            assert dbms[-1] is None, dbms

            env.SConsignFile('/$FOO')
            assert fnames[-1] == os.sep + 'SConsign', fnames
            assert dbms[-1] is None, dbms

            env.SConsignFile(os.sep + '$FOO')
            assert fnames[-1] == os.sep + 'SConsign', fnames
            assert dbms[-1] is None, dbms

            env.SConsignFile('$BAR', 'x')
            assert fnames[-1] == os.path.join(os.sep, 'File'), fnames
            assert dbms[-1] == 'x', dbms

            env.SConsignFile('__$BAR', 7)
            assert fnames[-1] == os.path.join(os.sep, 'dir', '__', 'File'), fnames
            assert dbms[-1] == 7, dbms

            env.SConsignFile()
            assert fnames[-1] == os.path.join(os.sep, 'dir', '.sconsign'), fnames
            assert dbms[-1] is None, dbms

            env.SConsignFile(None)
            assert fnames[-1] is None, fnames
            assert dbms[-1] is None, dbms
        finally:
            SCons.SConsign.File = save_SConsign_File

    def test_SideEffect(self):
        """Test the SideEffect() method"""
        env = self.TestEnvironment(LIB='lll', FOO='fff', BAR='bbb')
        env.File('mylll.pdb')
        env.Dir('mymmm.pdb')

        foo = env.Object('foo.obj', 'foo.cpp')[0]
        bar = env.Object('bar.obj', 'bar.cpp')[0]
        s = env.SideEffect('mylib.pdb', ['foo.obj', 'bar.obj'])[0]
        assert s.__class__.__name__ == 'Entry', s.__class__.__name__
        assert s.get_internal_path() == 'mylib.pdb'
        assert s.side_effect
        assert foo.side_effects == [s]
        assert bar.side_effects == [s]

        fff = env.Object('fff.obj', 'fff.cpp')[0]
        bbb = env.Object('bbb.obj', 'bbb.cpp')[0]
        s = env.SideEffect('my${LIB}.pdb', ['${FOO}.obj', '${BAR}.obj'])[0]
        assert s.__class__.__name__ == 'File', s.__class__.__name__
        assert s.get_internal_path() == 'mylll.pdb'
        assert s.side_effect
        assert fff.side_effects == [s], fff.side_effects
        assert bbb.side_effects == [s], bbb.side_effects

        ggg = env.Object('ggg.obj', 'ggg.cpp')[0]
        ccc = env.Object('ccc.obj', 'ccc.cpp')[0]
        s = env.SideEffect('mymmm.pdb', ['ggg.obj', 'ccc.obj'])[0]
        assert s.__class__.__name__ == 'Dir', s.__class__.__name__
        assert s.get_internal_path() == 'mymmm.pdb'
        assert s.side_effect
        assert ggg.side_effects == [s], ggg.side_effects
        assert ccc.side_effects == [s], ccc.side_effects

    def test_SourceCode(self):
        """Test the SourceCode() method."""
        env = self.TestEnvironment(FOO='mmm', BAR='nnn')
        e = env.SourceCode('foo', None)[0]
        assert e.get_internal_path() == 'foo'
        s = e.src_builder()
        assert s is None, s

        b = Builder()
        e = env.SourceCode(e, b)[0]
        assert e.get_internal_path() == 'foo'
        s = e.src_builder()
        assert s is b, s

        e = env.SourceCode('$BAR$FOO', None)[0]
        assert e.get_internal_path() == 'nnnmmm'
        s = e.src_builder()
        assert s is None, s

    def test_SourceSignatures(type):
        """Test the SourceSignatures() method"""
        import SCons.Errors

        env = type.TestEnvironment(M = 'MD5', T = 'timestamp')

        exc_caught = None
        try:
            env.SourceSignatures('invalid_type')
        except SCons.Errors.UserError:
            exc_caught = 1
        assert exc_caught, "did not catch expected UserError"

        env.SourceSignatures('MD5')
        assert env.src_sig_type == 'MD5', env.src_sig_type

        env.SourceSignatures('$M')
        assert env.src_sig_type == 'MD5', env.src_sig_type

        env.SourceSignatures('timestamp')
        assert env.src_sig_type == 'timestamp', env.src_sig_type

        env.SourceSignatures('$T')
        assert env.src_sig_type == 'timestamp', env.src_sig_type

        try:
            import SCons.Util
            save_md5 = SCons.Util.md5
            SCons.Util.md5 = None
            try:
                env.SourceSignatures('MD5')
            except SCons.Errors.UserError:
                pass
            else:
                self.fail('Did not catch expected UserError')
        finally:
            SCons.Util.md5 = save_md5

    def test_Split(self):
        """Test the Split() method"""
        env = self.TestEnvironment(FOO='fff', BAR='bbb')
        s = env.Split("foo bar")
        assert s == ["foo", "bar"], s
        s = env.Split("$FOO bar")
        assert s == ["fff", "bar"], s
        s = env.Split(["foo", "bar"])
        assert s == ["foo", "bar"], s
        s = env.Split(["foo", "${BAR}-bbb"])
        assert s == ["foo", "bbb-bbb"], s
        s = env.Split("foo")
        assert s == ["foo"], s
        s = env.Split("$FOO$BAR")
        assert s == ["fffbbb"], s

    def test_TargetSignatures(type):
        """Test the TargetSignatures() method"""
        import SCons.Errors

        env = type.TestEnvironment(B = 'build', C = 'content')

        exc_caught = None
        try:
            env.TargetSignatures('invalid_type')
        except SCons.Errors.UserError:
            exc_caught = 1
        assert exc_caught, "did not catch expected UserError"
        assert not hasattr(env, '_build_signature')

        env.TargetSignatures('build')
        assert env.tgt_sig_type == 'build', env.tgt_sig_type

        env.TargetSignatures('$B')
        assert env.tgt_sig_type == 'build', env.tgt_sig_type

        env.TargetSignatures('content')
        assert env.tgt_sig_type == 'content', env.tgt_sig_type

        env.TargetSignatures('$C')
        assert env.tgt_sig_type == 'content', env.tgt_sig_type

        env.TargetSignatures('MD5')
        assert env.tgt_sig_type == 'MD5', env.tgt_sig_type

        env.TargetSignatures('timestamp')
        assert env.tgt_sig_type == 'timestamp', env.tgt_sig_type

        try:
            import SCons.Util
            save_md5 = SCons.Util.md5
            SCons.Util.md5 = None
            try:
                env.TargetSignatures('MD5')
            except SCons.Errors.UserError:
                pass
            else:
                self.fail('Did not catch expected UserError')
            try:
                env.TargetSignatures('content')
            except SCons.Errors.UserError:
                pass
            else:
                self.fail('Did not catch expected UserError')
        finally:
            SCons.Util.md5 = save_md5

    def test_Value(self):
        """Test creating a Value() object
        """
        env = Environment()
        v1 = env.Value('a')
        assert v1.value == 'a', v1.value

        value2 = 'a'
        v2 = env.Value(value2)
        assert v2.value == value2, v2.value
        assert v2.value is value2, v2.value

        assert not v1 is v2
        assert v1.value == v2.value

        v3 = env.Value('c', 'build-c')
        assert v3.value == 'c', v3.value



    def test_Environment_global_variable(type):
        """Test setting Environment variable to an Environment.Base subclass"""
        class MyEnv(SCons.Environment.Base):
            def xxx(self, string):
                return self.subst(string)

        SCons.Environment.Environment = MyEnv

        env = SCons.Environment.Environment(FOO = 'foo')

        f = env.subst('$FOO')
        assert f == 'foo', f

        f = env.xxx('$FOO')
        assert f == 'foo', f

    def test_bad_keywords(self):
        """Test trying to use reserved keywords in an Environment"""
        added = []

        env = self.TestEnvironment(TARGETS = 'targets',
                                   SOURCES = 'sources',
                                   SOURCE = 'source',
                                   TARGET = 'target',
                                   CHANGED_SOURCES = 'changed_sources',
                                   CHANGED_TARGETS = 'changed_targets',
                                   UNCHANGED_SOURCES = 'unchanged_sources',
                                   UNCHANGED_TARGETS = 'unchanged_targets',
                                   INIT = 'init')
        bad_msg = '%s is not reserved, but got omitted; see Environment.construction_var_name_ok'
        added.append('INIT')
        for x in self.reserved_variables:
            assert x not in env, env[x]
        for x in added:
            assert x in env, bad_msg % x

        env.Append(TARGETS = 'targets',
                   SOURCES = 'sources',
                   SOURCE = 'source',
                   TARGET = 'target',
                   CHANGED_SOURCES = 'changed_sources',
                   CHANGED_TARGETS = 'changed_targets',
                   UNCHANGED_SOURCES = 'unchanged_sources',
                   UNCHANGED_TARGETS = 'unchanged_targets',
                   APPEND = 'append')
        added.append('APPEND')
        for x in self.reserved_variables:
            assert x not in env, env[x]
        for x in added:
            assert x in env, bad_msg % x

        env.AppendUnique(TARGETS = 'targets',
                         SOURCES = 'sources',
                         SOURCE = 'source',
                         TARGET = 'target',
                         CHANGED_SOURCES = 'changed_sources',
                         CHANGED_TARGETS = 'changed_targets',
                         UNCHANGED_SOURCES = 'unchanged_sources',
                         UNCHANGED_TARGETS = 'unchanged_targets',
                         APPENDUNIQUE = 'appendunique')
        added.append('APPENDUNIQUE')
        for x in self.reserved_variables:
            assert x not in env, env[x]
        for x in added:
            assert x in env, bad_msg % x

        env.Prepend(TARGETS = 'targets',
                    SOURCES = 'sources',
                    SOURCE = 'source',
                    TARGET = 'target',
                    CHANGED_SOURCES = 'changed_sources',
                    CHANGED_TARGETS = 'changed_targets',
                    UNCHANGED_SOURCES = 'unchanged_sources',
                    UNCHANGED_TARGETS = 'unchanged_targets',
                    PREPEND = 'prepend')
        added.append('PREPEND')
        for x in self.reserved_variables:
            assert x not in env, env[x]
        for x in added:
            assert x in env, bad_msg % x

        env.Prepend(TARGETS = 'targets',
                    SOURCES = 'sources',
                    SOURCE = 'source',
                    TARGET = 'target',
                    CHANGED_SOURCES = 'changed_sources',
                    CHANGED_TARGETS = 'changed_targets',
                    UNCHANGED_SOURCES = 'unchanged_sources',
                    UNCHANGED_TARGETS = 'unchanged_targets',
                    PREPENDUNIQUE = 'prependunique')
        added.append('PREPENDUNIQUE')
        for x in self.reserved_variables:
            assert x not in env, env[x]
        for x in added:
            assert x in env, bad_msg % x

        env.Replace(TARGETS = 'targets',
                    SOURCES = 'sources',
                    SOURCE = 'source',
                    TARGET = 'target',
                    CHANGED_SOURCES = 'changed_sources',
                    CHANGED_TARGETS = 'changed_targets',
                    UNCHANGED_SOURCES = 'unchanged_sources',
                    UNCHANGED_TARGETS = 'unchanged_targets',
                    REPLACE = 'replace')
        added.append('REPLACE')
        for x in self.reserved_variables:
            assert x not in env, env[x]
        for x in added:
            assert x in env, bad_msg % x

        copy = env.Clone(TARGETS = 'targets',
                         SOURCES = 'sources',
                         SOURCE = 'source',
                         TARGET = 'target',
                         CHANGED_SOURCES = 'changed_sources',
                         CHANGED_TARGETS = 'changed_targets',
                         UNCHANGED_SOURCES = 'unchanged_sources',
                         UNCHANGED_TARGETS = 'unchanged_targets',
                         COPY = 'copy')
        for x in self.reserved_variables:
            assert x not in copy, env[x]
        for x in added + ['COPY']:
            assert x in copy, bad_msg % x

        over = env.Override({'TARGETS' : 'targets',
                             'SOURCES' : 'sources',
                             'SOURCE' : 'source',
                             'TARGET' : 'target',
                             'CHANGED_SOURCES' : 'changed_sources',
                             'CHANGED_TARGETS' : 'changed_targets',
                             'UNCHANGED_SOURCES' : 'unchanged_sources',
                             'UNCHANGED_TARGETS' : 'unchanged_targets',
                             'OVERRIDE' : 'override'})
        for x in self.reserved_variables:
            assert x not in over, over[x]
        for x in added + ['OVERRIDE']:
            assert x in over, bad_msg % x

    def test_parse_flags(self):
        '''Test the Base class parse_flags argument'''
        # all we have to show is that it gets to MergeFlags internally
        env = Environment(tools=[], parse_flags = '-X')
        assert env['CCFLAGS'] == ['-X'], env['CCFLAGS']

        env = Environment(tools=[], CCFLAGS=None, parse_flags = '-Y')
        assert env['CCFLAGS'] == ['-Y'], env['CCFLAGS']

        env = Environment(tools=[], CPPDEFINES = 'FOO', parse_flags = '-std=c99 -X -DBAR')
        assert env['CFLAGS']  == ['-std=c99'], env['CFLAGS']
        assert env['CCFLAGS'] == ['-X'], env['CCFLAGS']
        assert env['CPPDEFINES'] == ['FOO', 'BAR'], env['CPPDEFINES']

    def test_clone_parse_flags(self):
        '''Test the env.Clone() parse_flags argument'''
        # all we have to show is that it gets to MergeFlags internally
        env = Environment(tools = [])
        env2 = env.Clone(parse_flags = '-X')
        assert 'CCFLAGS' not in env
        assert env2['CCFLAGS'] == ['-X'], env2['CCFLAGS']

        env = Environment(tools = [], CCFLAGS=None)
        env2 = env.Clone(parse_flags = '-Y')
        assert env['CCFLAGS'] is None, env['CCFLAGS']
        assert env2['CCFLAGS'] == ['-Y'], env2['CCFLAGS']

        env = Environment(tools = [], CPPDEFINES = 'FOO')
        env2 = env.Clone(parse_flags = '-std=c99 -X -DBAR')
        assert 'CFLAGS' not in env
        assert env2['CFLAGS']  == ['-std=c99'], env2['CFLAGS']
        assert 'CCFLAGS' not in env
        assert env2['CCFLAGS'] == ['-X'], env2['CCFLAGS']
        assert env['CPPDEFINES'] == 'FOO', env['CPPDEFINES']
        assert env2['CPPDEFINES'] == ['FOO','BAR'], env2['CPPDEFINES']



class OverrideEnvironmentTestCase(unittest.TestCase,TestEnvironmentFixture):

    def setUp(self):
        env = Environment()
        env._dict = {'XXX' : 'x', 'YYY' : 'y'}
        env2 = OverrideEnvironment(env, {'XXX' : 'x2'})
        env3 = OverrideEnvironment(env2, {'XXX' : 'x3', 'YYY' : 'y3', 'ZZZ' : 'z3'})
        self.envs = [ env, env2, env3 ]

    def checkpath(self, node, expect):
        return str(node) == os.path.normpath(expect)

    def test___init__(self):
        """Test OverrideEnvironment initialization"""
        env, env2, env3 = self.envs
        assert env['XXX'] == 'x', env['XXX']
        assert env2['XXX'] == 'x2', env2['XXX']
        assert env3['XXX'] == 'x3', env3['XXX']
        assert env['YYY'] == 'y', env['YYY']
        assert env2['YYY'] == 'y', env2['YYY']
        assert env3['YYY'] == 'y3', env3['YYY']

    def test___delitem__(self):
        """Test deleting variables from an OverrideEnvironment"""
        env, env2, env3 = self.envs

        del env3['XXX']
        assert 'XXX' not in env, "env has XXX?"
        assert 'XXX' not in env2, "env2 has XXX?"
        assert 'XXX' not in env3, "env3 has XXX?"

        del env3['YYY']
        assert 'YYY' not in env, "env has YYY?"
        assert 'YYY' not in env2, "env2 has YYY?"
        assert 'YYY' not in env3, "env3 has YYY?"

        del env3['ZZZ']
        assert 'ZZZ' not in env, "env has ZZZ?"
        assert 'ZZZ' not in env2, "env2 has ZZZ?"
        assert 'ZZZ' not in env3, "env3 has ZZZ?"

    def test_get(self):
        """Test the OverrideEnvironment get() method"""
        env, env2, env3 = self.envs
        assert env.get('XXX') == 'x', env.get('XXX')
        assert env2.get('XXX') == 'x2', env2.get('XXX')
        assert env3.get('XXX') == 'x3', env3.get('XXX')
        assert env.get('YYY') == 'y', env.get('YYY')
        assert env2.get('YYY') == 'y', env2.get('YYY')
        assert env3.get('YYY') == 'y3', env3.get('YYY')
        assert env.get('ZZZ') is None, env.get('ZZZ')
        assert env2.get('ZZZ') is None, env2.get('ZZZ')
        assert env3.get('ZZZ') == 'z3', env3.get('ZZZ')

    def test_has_key(self):
        """Test the OverrideEnvironment has_key() method"""
        env, env2, env3 = self.envs
        assert 'XXX' in env, 'XXX' in env
        assert 'XXX' in env2, 'XXX' in env2
        assert 'XXX' in env3, 'XXX' in env3
        assert 'YYY' in env, 'YYY' in env
        assert 'YYY' in env2, 'YYY' in env2
        assert 'YYY' in env3, 'YYY' in env3
        assert 'ZZZ' not in env, 'ZZZ' in env
        assert 'ZZZ' not in env2, 'ZZZ' in env2
        assert 'ZZZ' in env3, 'ZZZ' in env3

    def test_contains(self):
        """Test the OverrideEnvironment __contains__() method"""
        env, env2, env3 = self.envs
        assert 'XXX' in env
        assert 'XXX' in env2
        assert 'XXX' in env3
        assert 'YYY' in env
        assert 'YYY' in env2
        assert 'YYY' in env3
        assert not 'ZZZ' in env
        assert not 'ZZZ' in env2
        assert 'ZZZ' in env3

    def test_items(self):
        """Test the OverrideEnvironment Dictionary() method"""
        env, env2, env3 = self.envs
        items = env.Dictionary()
        assert items == {'XXX' : 'x', 'YYY' : 'y'}, items
        items = env2.Dictionary()
        assert items == {'XXX' : 'x2', 'YYY' : 'y'}, items
        items = env3.Dictionary()
        assert items == {'XXX' : 'x3', 'YYY' : 'y3', 'ZZZ' : 'z3'}, items

    def test_items(self):
        """Test the OverrideEnvironment items() method"""
        env, env2, env3 = self.envs
        items = sorted(env.items())
        assert items == [('XXX', 'x'), ('YYY', 'y')], items
        items = sorted(env2.items())
        assert items == [('XXX', 'x2'), ('YYY', 'y')], items
        items = sorted(env3.items())
        assert items == [('XXX', 'x3'), ('YYY', 'y3'), ('ZZZ', 'z3')], items

    def test_gvars(self):
        """Test the OverrideEnvironment gvars() method"""
        env, env2, env3 = self.envs
        gvars = env.gvars()
        assert gvars == {'XXX' : 'x', 'YYY' : 'y'}, gvars
        gvars = env2.gvars()
        assert gvars == {'XXX' : 'x', 'YYY' : 'y'}, gvars
        gvars = env3.gvars()
        assert gvars == {'XXX' : 'x', 'YYY' : 'y'}, gvars

    def test_lvars(self):
        """Test the OverrideEnvironment lvars() method"""
        env, env2, env3 = self.envs
        lvars = env.lvars()
        assert lvars == {}, lvars
        lvars = env2.lvars()
        assert lvars == {'XXX' : 'x2'}, lvars
        lvars = env3.lvars()
        assert lvars == {'XXX' : 'x3', 'YYY' : 'y3', 'ZZZ' : 'z3'}, lvars

    def test_Replace(self):
        """Test the OverrideEnvironment Replace() method"""
        env, env2, env3 = self.envs
        assert env['XXX'] == 'x', env['XXX']
        assert env2['XXX'] == 'x2', env2['XXX']
        assert env3['XXX'] == 'x3', env3['XXX']
        assert env['YYY'] == 'y', env['YYY']
        assert env2['YYY'] == 'y', env2['YYY']
        assert env3['YYY'] == 'y3', env3['YYY']

        env.Replace(YYY = 'y4')

        assert env['XXX'] == 'x', env['XXX']
        assert env2['XXX'] == 'x2', env2['XXX']
        assert env3['XXX'] == 'x3', env3['XXX']
        assert env['YYY'] == 'y4', env['YYY']
        assert env2['YYY'] == 'y4', env2['YYY']
        assert env3['YYY'] == 'y3', env3['YYY']

    # Tests a number of Base methods through an OverrideEnvironment to
    # make sure they handle overridden constructionv variables properly.
    #
    # The following Base methods also call self.subst(), and so could
    # theoretically be subject to problems with evaluating overridden
    # variables, but they're never really called that way in the rest
    # of our code, so we won't worry about them (at least for now):
    #
    # ParseConfig()
    # ParseDepends()
    # Platform()
    # Tool()
    #
    # Action()
    # Alias()
    # Builder()
    # CacheDir()
    # Configure()
    # Environment()
    # FindFile()
    # Scanner()
    # SourceSignatures()
    # TargetSignatures()

    # It's unlikely Clone() will ever be called this way, so let the
    # other methods test that handling overridden values works.
    #def test_Clone(self):
    #    """Test the OverrideEnvironment Clone() method"""
    #    pass

    def test_FindIxes(self):
        """Test the OverrideEnvironment FindIxes() method"""
        env, env2, env3 = self.envs
        x = env.FindIxes(['xaaay'], 'XXX', 'YYY')
        assert x == 'xaaay', x
        x = env2.FindIxes(['x2aaay'], 'XXX', 'YYY')
        assert x == 'x2aaay', x
        x = env3.FindIxes(['x3aaay3'], 'XXX', 'YYY')
        assert x == 'x3aaay3', x

    def test_ReplaceIxes(self):
        """Test the OverrideEnvironment ReplaceIxes() method"""
        env, env2, env3 = self.envs
        x = env.ReplaceIxes('xaaay', 'XXX', 'YYY', 'YYY', 'XXX')
        assert x == 'yaaax', x
        x = env2.ReplaceIxes('x2aaay', 'XXX', 'YYY', 'YYY', 'XXX')
        assert x == 'yaaax2', x
        x = env3.ReplaceIxes('x3aaay3', 'XXX', 'YYY', 'YYY', 'XXX')
        assert x == 'y3aaax3', x

    # It's unlikely WhereIs() will ever be called this way, so let the
    # other methods test that handling overridden values works.
    #def test_WhereIs(self):
    #    """Test the OverrideEnvironment WhereIs() method"""
    #    pass

    def test_Dir(self):
        """Test the OverrideEnvironment Dir() method"""
        env, env2, env3 = self.envs
        x = env.Dir('ddir/$XXX')
        assert self.checkpath(x, 'ddir/x'), str(x)
        x = env2.Dir('ddir/$XXX')
        assert self.checkpath(x, 'ddir/x2'), str(x)
        x = env3.Dir('ddir/$XXX')
        assert self.checkpath(x, 'ddir/x3'), str(x)

    def test_Entry(self):
        """Test the OverrideEnvironment Entry() method"""
        env, env2, env3 = self.envs
        x = env.Entry('edir/$XXX')
        assert self.checkpath(x, 'edir/x'), str(x)
        x = env2.Entry('edir/$XXX')
        assert self.checkpath(x, 'edir/x2'), str(x)
        x = env3.Entry('edir/$XXX')
        assert self.checkpath(x, 'edir/x3'), str(x)

    def test_File(self):
        """Test the OverrideEnvironment File() method"""
        env, env2, env3 = self.envs
        x = env.File('fdir/$XXX')
        assert self.checkpath(x, 'fdir/x'), str(x)
        x = env2.File('fdir/$XXX')
        assert self.checkpath(x, 'fdir/x2'), str(x)
        x = env3.File('fdir/$XXX')
        assert self.checkpath(x, 'fdir/x3'), str(x)

    def test_Split(self):
        """Test the OverrideEnvironment Split() method"""
        env, env2, env3 = self.envs
        env['AAA'] = '$XXX $YYY $ZZZ'
        x = env.Split('$AAA')
        assert x == ['x', 'y'], x
        x = env2.Split('$AAA')
        assert x == ['x2', 'y'], x
        x = env3.Split('$AAA')
        assert x == ['x3', 'y3', 'z3'], x

    def test_parse_flags(self):
        '''Test the OverrideEnvironment parse_flags argument'''
        # all we have to show is that it gets to MergeFlags internally
        env = SubstitutionEnvironment()
        env2 = env.Override({'parse_flags' : '-X'})
        assert 'CCFLAGS' not in env
        assert env2['CCFLAGS'] == ['-X'], env2['CCFLAGS']

        env = SubstitutionEnvironment(CCFLAGS=None)
        env2 = env.Override({'parse_flags' : '-Y'})
        assert env['CCFLAGS'] is None, env['CCFLAGS']
        assert env2['CCFLAGS'] == ['-Y'], env2['CCFLAGS']

        env = SubstitutionEnvironment(CPPDEFINES = 'FOO')
        env2 = env.Override({'parse_flags' : '-std=c99 -X -DBAR'})
        assert 'CFLAGS' not in env
        assert env2['CFLAGS']  == ['-std=c99'], env2['CFLAGS']
        assert 'CCFLAGS' not in env
        assert env2['CCFLAGS'] == ['-X'], env2['CCFLAGS']
        assert env['CPPDEFINES'] == 'FOO', env['CPPDEFINES']
        assert env2['CPPDEFINES'] == ['FOO','BAR'], env2['CPPDEFINES']



class NoSubstitutionProxyTestCase(unittest.TestCase,TestEnvironmentFixture):

    def test___init__(self):
        """Test NoSubstitutionProxy initialization"""
        env = self.TestEnvironment(XXX = 'x', YYY = 'y')
        assert env['XXX'] == 'x', env['XXX']
        assert env['YYY'] == 'y', env['YYY']

        proxy = NoSubstitutionProxy(env)
        assert proxy['XXX'] == 'x', proxy['XXX']
        assert proxy['YYY'] == 'y', proxy['YYY']

    def test_attributes(self):
        """Test getting and setting NoSubstitutionProxy attributes"""
        env = Environment()
        setattr(env, 'env_attr', 'value1')

        proxy = NoSubstitutionProxy(env)
        setattr(proxy, 'proxy_attr', 'value2')

        x = getattr(env, 'env_attr')
        assert x == 'value1', x
        x = getattr(proxy, 'env_attr')
        assert x == 'value1', x

        x = getattr(env, 'proxy_attr')
        assert x == 'value2', x
        x = getattr(proxy, 'proxy_attr')
        assert x == 'value2', x

    def test_subst(self):
        """Test the NoSubstitutionProxy.subst() method"""
        env = self.TestEnvironment(XXX = 'x', YYY = 'y')
        assert env['XXX'] == 'x', env['XXX']
        assert env['YYY'] == 'y', env['YYY']

        proxy = NoSubstitutionProxy(env)
        assert proxy['XXX'] == 'x', proxy['XXX']
        assert proxy['YYY'] == 'y', proxy['YYY']

        x = env.subst('$XXX')
        assert x == 'x', x
        x = proxy.subst('$XXX')
        assert x == '$XXX', x

        x = proxy.subst('$YYY', raw=7, target=None, source=None,
                        conv=None,
                        extra_meaningless_keyword_argument=None)
        assert x == '$YYY', x

    def test_subst_kw(self):
        """Test the NoSubstitutionProxy.subst_kw() method"""
        env = self.TestEnvironment(XXX = 'x', YYY = 'y')
        assert env['XXX'] == 'x', env['XXX']
        assert env['YYY'] == 'y', env['YYY']

        proxy = NoSubstitutionProxy(env)
        assert proxy['XXX'] == 'x', proxy['XXX']
        assert proxy['YYY'] == 'y', proxy['YYY']

        x = env.subst_kw({'$XXX':'$YYY'})
        assert x == {'x':'y'}, x
        x = proxy.subst_kw({'$XXX':'$YYY'})
        assert x == {'$XXX':'$YYY'}, x

    def test_subst_list(self):
        """Test the NoSubstitutionProxy.subst_list() method"""
        env = self.TestEnvironment(XXX = 'x', YYY = 'y')
        assert env['XXX'] == 'x', env['XXX']
        assert env['YYY'] == 'y', env['YYY']

        proxy = NoSubstitutionProxy(env)
        assert proxy['XXX'] == 'x', proxy['XXX']
        assert proxy['YYY'] == 'y', proxy['YYY']

        x = env.subst_list('$XXX')
        assert x == [['x']], x
        x = proxy.subst_list('$XXX')
        assert x == [[]], x

        x = proxy.subst_list('$YYY', raw=0, target=None, source=None, conv=None)
        assert x == [[]], x

    def test_subst_target_source(self):
        """Test the NoSubstitutionProxy.subst_target_source() method"""
        env = self.TestEnvironment(XXX = 'x', YYY = 'y')
        assert env['XXX'] == 'x', env['XXX']
        assert env['YYY'] == 'y', env['YYY']

        proxy = NoSubstitutionProxy(env)
        assert proxy['XXX'] == 'x', proxy['XXX']
        assert proxy['YYY'] == 'y', proxy['YYY']

        args = ('$XXX $TARGET $SOURCE $YYY',)
        kw = {'target' : DummyNode('ttt'), 'source' : DummyNode('sss')}
        x = env.subst_target_source(*args, **kw)
        assert x == 'x ttt sss y', x
        x = proxy.subst_target_source(*args, **kw)
        assert x == ' ttt sss ', x

class EnvironmentVariableTestCase(unittest.TestCase):

    def test_is_valid_construction_var(self):
        """Testing is_valid_construction_var()"""
        r = is_valid_construction_var("_a")
        assert r is not None, r
        r = is_valid_construction_var("z_")
        assert r is not None, r
        r = is_valid_construction_var("X_")
        assert r is not None, r
        r = is_valid_construction_var("2a")
        assert r is None, r
        r = is_valid_construction_var("a2_")
        assert r is not None, r
        r = is_valid_construction_var("/")
        assert r is None, r
        r = is_valid_construction_var("_/")
        assert r is None, r
        r = is_valid_construction_var("a/")
        assert r is None, r
        r = is_valid_construction_var(".b")
        assert r is None, r
        r = is_valid_construction_var("_.b")
        assert r is None, r
        r = is_valid_construction_var("b1._")
        assert r is None, r
        r = is_valid_construction_var("-b")
        assert r is None, r
        r = is_valid_construction_var("_-b")
        assert r is None, r
        r = is_valid_construction_var("b1-_")
        assert r is None, r



if __name__ == "__main__":
    suite = unittest.TestSuite()
    tclasses = [ SubstitutionTestCase,
                 BaseTestCase,
                 OverrideEnvironmentTestCase,
                 NoSubstitutionProxyTestCase,
                 EnvironmentVariableTestCase ]
    for tclass in tclasses:
        names = unittest.getTestCaseNames(tclass, 'test_')
        suite.addTests(list(map(tclass, names)))
    TestUnit.run(suite)

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