Recipe package system.

recipe_engine/third_party/setuptools/tests/test_resources.py

+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# NOTE: the shebang and encoding lines are for ScriptHeaderTests do not remove
+
+import os
+import sys
+import tempfile
+import shutil
+from unittest import TestCase
+
+import setuptools._vendor.packaging.version
+import setuptools._vendor.packaging.specifiers
+packaging = setuptools._vendor.packaging
+
+import pkg_resources
+from pkg_resources import (parse_requirements, VersionConflict, parse_version,
+    Distribution, EntryPoint, Requirement, safe_version, safe_name,
+    WorkingSet)
+
+from setuptools.command.easy_install import (get_script_header, is_sh,
+    nt_quote_arg)
+from setuptools.compat import StringIO, iteritems, PY3
+from .py26compat import skipIf
+
+def safe_repr(obj, short=False):
+    """ copied from Python2.7"""
+    try:
+        result = repr(obj)
+    except Exception:
+        result = object.__repr__(obj)
+    if not short or len(result) < pkg_resources._MAX_LENGTH:
+        return result
+    return result[:pkg_resources._MAX_LENGTH] + ' [truncated]...'
+
+class Metadata(pkg_resources.EmptyProvider):
+    """Mock object to return metadata as if from an on-disk distribution"""
+
+    def __init__(self,*pairs):
+        self.metadata = dict(pairs)
+
+    def has_metadata(self,name):
+        return name in self.metadata
+
+    def get_metadata(self,name):
+        return self.metadata[name]
+
+    def get_metadata_lines(self,name):
+        return pkg_resources.yield_lines(self.get_metadata(name))
+
+dist_from_fn = pkg_resources.Distribution.from_filename
+
+class DistroTests(TestCase):
+
+    def testCollection(self):
+        # empty path should produce no distributions
+        ad = pkg_resources.Environment([], platform=None, python=None)
+        self.assertEqual(list(ad), [])
+        self.assertEqual(ad['FooPkg'],[])
+        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
+        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
+        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))
+
+        # Name is in there now
+        self.assertTrue(ad['FooPkg'])
+        # But only 1 package
+        self.assertEqual(list(ad), ['foopkg'])
+
+        # Distributions sort by version
+        self.assertEqual(
+            [dist.version for dist in ad['FooPkg']], ['1.4','1.3-1','1.2']
+        )
+        # Removing a distribution leaves sequence alone
+        ad.remove(ad['FooPkg'][1])
+        self.assertEqual(
+            [dist.version for dist in ad['FooPkg']], ['1.4','1.2']
+        )
+        # And inserting adds them in order
+        ad.add(dist_from_fn("FooPkg-1.9.egg"))
+        self.assertEqual(
+            [dist.version for dist in ad['FooPkg']], ['1.9','1.4','1.2']
+        )
+
+        ws = WorkingSet([])
+        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
+        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
+        req, = parse_requirements("FooPkg>=1.3")
+
+        # Nominal case: no distros on path, should yield all applicable
+        self.assertEqual(ad.best_match(req,ws).version, '1.9')
+        # If a matching distro is already installed, should return only that
+        ws.add(foo14)
+        self.assertEqual(ad.best_match(req,ws).version, '1.4')
+
+        # If the first matching distro is unsuitable, it's a version conflict
+        ws = WorkingSet([])
+        ws.add(foo12)
+        ws.add(foo14)
+        self.assertRaises(VersionConflict, ad.best_match, req, ws)
+
+        # If more than one match on the path, the first one takes precedence
+        ws = WorkingSet([])
+        ws.add(foo14)
+        ws.add(foo12)
+        ws.add(foo14)
+        self.assertEqual(ad.best_match(req,ws).version, '1.4')
+
+    def checkFooPkg(self,d):
+        self.assertEqual(d.project_name, "FooPkg")
+        self.assertEqual(d.key, "foopkg")
+        self.assertEqual(d.version, "1.3.post1")
+        self.assertEqual(d.py_version, "2.4")
+        self.assertEqual(d.platform, "win32")
+        self.assertEqual(d.parsed_version, parse_version("1.3-1"))
+
+    def testDistroBasics(self):
+        d = Distribution(
+            "/some/path",
+            project_name="FooPkg",version="1.3-1",py_version="2.4",platform="win32"
+        )
+        self.checkFooPkg(d)
+
+        d = Distribution("/some/path")
+        self.assertEqual(d.py_version, sys.version[:3])
+        self.assertEqual(d.platform, None)
+
+    def testDistroParse(self):
+        d = dist_from_fn("FooPkg-1.3.post1-py2.4-win32.egg")
+        self.checkFooPkg(d)
+        d = dist_from_fn("FooPkg-1.3.post1-py2.4-win32.egg-info")
+        self.checkFooPkg(d)
+
+    def testDistroMetadata(self):
+        d = Distribution(
+            "/some/path", project_name="FooPkg", py_version="2.4", platform="win32",
+            metadata = Metadata(
+                ('PKG-INFO',"Metadata-Version: 1.0\nVersion: 1.3-1\n")
+            )
+        )
+        self.checkFooPkg(d)
+
+    def distRequires(self, txt):
+        return Distribution("/foo", metadata=Metadata(('depends.txt', txt)))
+
+    def checkRequires(self, dist, txt, extras=()):
+        self.assertEqual(
+            list(dist.requires(extras)),
+            list(parse_requirements(txt))
+        )
+
+    def testDistroDependsSimple(self):
+        for v in "Twisted>=1.5", "Twisted>=1.5\nZConfig>=2.0":
+            self.checkRequires(self.distRequires(v), v)
+
+    def testResolve(self):
+        ad = pkg_resources.Environment([])
+        ws = WorkingSet([])
+        # Resolving no requirements -> nothing to install
+        self.assertEqual(list(ws.resolve([],ad)), [])
+        # Request something not in the collection -> DistributionNotFound
+        self.assertRaises(
+            pkg_resources.DistributionNotFound, ws.resolve, parse_requirements("Foo"), ad
+        )
+        Foo = Distribution.from_filename(
+            "/foo_dir/Foo-1.2.egg",
+            metadata=Metadata(('depends.txt', "[bar]\nBaz>=2.0"))
+        )
+        ad.add(Foo)
+        ad.add(Distribution.from_filename("Foo-0.9.egg"))
+
+        # Request thing(s) that are available -> list to activate
+        for i in range(3):
+            targets = list(ws.resolve(parse_requirements("Foo"), ad))
+            self.assertEqual(targets, [Foo])
+            list(map(ws.add,targets))
+        self.assertRaises(VersionConflict, ws.resolve,
+            parse_requirements("Foo==0.9"), ad)
+        ws = WorkingSet([]) # reset
+
+        # Request an extra that causes an unresolved dependency for "Baz"
+        self.assertRaises(
+            pkg_resources.DistributionNotFound, ws.resolve,parse_requirements("Foo[bar]"), ad
+        )
+        Baz = Distribution.from_filename(
+            "/foo_dir/Baz-2.1.egg", metadata=Metadata(('depends.txt', "Foo"))
+        )
+        ad.add(Baz)
+
+        # Activation list now includes resolved dependency
+        self.assertEqual(
+            list(ws.resolve(parse_requirements("Foo[bar]"), ad)), [Foo,Baz]
+        )
+        # Requests for conflicting versions produce VersionConflict
+        self.assertRaises(VersionConflict,
+            ws.resolve, parse_requirements("Foo==1.2\nFoo!=1.2"), ad)
+
+    def testDistroDependsOptions(self):
+        d = self.distRequires("""
+            Twisted>=1.5
+            [docgen]
+            ZConfig>=2.0
+            docutils>=0.3
+            [fastcgi]
+            fcgiapp>=0.1""")
+        self.checkRequires(d,"Twisted>=1.5")
+        self.checkRequires(
+            d,"Twisted>=1.5 ZConfig>=2.0 docutils>=0.3".split(), ["docgen"]
+        )
+        self.checkRequires(
+            d,"Twisted>=1.5 fcgiapp>=0.1".split(), ["fastcgi"]
+        )
+        self.checkRequires(
+            d,"Twisted>=1.5 ZConfig>=2.0 docutils>=0.3 fcgiapp>=0.1".split(),
+            ["docgen","fastcgi"]
+        )
+        self.checkRequires(
+            d,"Twisted>=1.5 fcgiapp>=0.1 ZConfig>=2.0 docutils>=0.3".split(),
+            ["fastcgi", "docgen"]
+        )
+        self.assertRaises(pkg_resources.UnknownExtra, d.requires, ["foo"])
+
+
+class EntryPointTests(TestCase):
+
+    def assertfields(self, ep):
+        self.assertEqual(ep.name,"foo")
+        self.assertEqual(ep.module_name,"setuptools.tests.test_resources")
+        self.assertEqual(ep.attrs, ("EntryPointTests",))
+        self.assertEqual(ep.extras, ("x",))
+        self.assertTrue(ep.load() is EntryPointTests)
+        self.assertEqual(
+            str(ep),
+            "foo = setuptools.tests.test_resources:EntryPointTests [x]"
+        )
+
+    def setUp(self):
+        self.dist = Distribution.from_filename(
+            "FooPkg-1.2-py2.4.egg", metadata=Metadata(('requires.txt','[x]')))
+
+    def testBasics(self):
+        ep = EntryPoint(
+            "foo", "setuptools.tests.test_resources", ["EntryPointTests"],
+            ["x"], self.dist
+        )
+        self.assertfields(ep)
+
+    def testParse(self):
+        s = "foo = setuptools.tests.test_resources:EntryPointTests [x]"
+        ep = EntryPoint.parse(s, self.dist)
+        self.assertfields(ep)
+
+        ep = EntryPoint.parse("bar baz=  spammity[PING]")
+        self.assertEqual(ep.name,"bar baz")
+        self.assertEqual(ep.module_name,"spammity")
+        self.assertEqual(ep.attrs, ())
+        self.assertEqual(ep.extras, ("ping",))
+
+        ep = EntryPoint.parse(" fizzly =  wocka:foo")
+        self.assertEqual(ep.name,"fizzly")
+        self.assertEqual(ep.module_name,"wocka")
+        self.assertEqual(ep.attrs, ("foo",))
+        self.assertEqual(ep.extras, ())
+
+    def testRejects(self):
+        for ep in [
+            "foo", "x=1=2", "x=a:b:c", "q=x/na", "fez=pish:tush-z", "x=f[a]>2",
+        ]:
+            try: EntryPoint.parse(ep)
+            except ValueError: pass
+            else: raise AssertionError("Should've been bad", ep)
+
+    def checkSubMap(self, m):
+        self.assertEqual(len(m), len(self.submap_expect))
+        for key, ep in iteritems(self.submap_expect):
+            self.assertEqual(repr(m.get(key)), repr(ep))
+
+    submap_expect = dict(
+        feature1=EntryPoint('feature1', 'somemodule', ['somefunction']),
+        feature2=EntryPoint('feature2', 'another.module', ['SomeClass'], ['extra1','extra2']),
+        feature3=EntryPoint('feature3', 'this.module', extras=['something'])
+    )
+    submap_str = """
+            # define features for blah blah
+            feature1 = somemodule:somefunction
+            feature2 = another.module:SomeClass [extra1,extra2]
+            feature3 = this.module [something]
+    """
+
+    def testParseList(self):
+        self.checkSubMap(EntryPoint.parse_group("xyz", self.submap_str))
+        self.assertRaises(ValueError, EntryPoint.parse_group, "x a", "foo=bar")
+        self.assertRaises(ValueError, EntryPoint.parse_group, "x",
+            ["foo=baz", "foo=bar"])
+
+    def testParseMap(self):
+        m = EntryPoint.parse_map({'xyz':self.submap_str})
+        self.checkSubMap(m['xyz'])
+        self.assertEqual(list(m.keys()),['xyz'])
+        m = EntryPoint.parse_map("[xyz]\n"+self.submap_str)
+        self.checkSubMap(m['xyz'])
+        self.assertEqual(list(m.keys()),['xyz'])
+        self.assertRaises(ValueError, EntryPoint.parse_map, ["[xyz]", "[xyz]"])
+        self.assertRaises(ValueError, EntryPoint.parse_map, self.submap_str)
+
+class RequirementsTests(TestCase):
+
+    def testBasics(self):
+        r = Requirement.parse("Twisted>=1.2")
+        self.assertEqual(str(r),"Twisted>=1.2")
+        self.assertEqual(repr(r),"Requirement.parse('Twisted>=1.2')")
+        self.assertEqual(r, Requirement("Twisted", [('>=','1.2')], ()))
+        self.assertEqual(r, Requirement("twisTed", [('>=','1.2')], ()))
+        self.assertNotEqual(r, Requirement("Twisted", [('>=','2.0')], ()))
+        self.assertNotEqual(r, Requirement("Zope", [('>=','1.2')], ()))
+        self.assertNotEqual(r, Requirement("Zope", [('>=','3.0')], ()))
+        self.assertNotEqual(r, Requirement.parse("Twisted[extras]>=1.2"))
+
+    def testOrdering(self):
+        r1 = Requirement("Twisted", [('==','1.2c1'),('>=','1.2')], ())
+        r2 = Requirement("Twisted", [('>=','1.2'),('==','1.2c1')], ())
+        self.assertEqual(r1,r2)
+        self.assertEqual(str(r1),str(r2))
+        self.assertEqual(str(r2),"Twisted==1.2c1,>=1.2")
+
+    def testBasicContains(self):
+        r = Requirement("Twisted", [('>=','1.2')], ())
+        foo_dist = Distribution.from_filename("FooPkg-1.3_1.egg")
+        twist11 = Distribution.from_filename("Twisted-1.1.egg")
+        twist12 = Distribution.from_filename("Twisted-1.2.egg")
+        self.assertTrue(parse_version('1.2') in r)
+        self.assertTrue(parse_version('1.1') not in r)
+        self.assertTrue('1.2' in r)
+        self.assertTrue('1.1' not in r)
+        self.assertTrue(foo_dist not in r)
+        self.assertTrue(twist11 not in r)
+        self.assertTrue(twist12 in r)
+
+    def testOptionsAndHashing(self):
+        r1 = Requirement.parse("Twisted[foo,bar]>=1.2")
+        r2 = Requirement.parse("Twisted[bar,FOO]>=1.2")
+        self.assertEqual(r1,r2)
+        self.assertEqual(r1.extras, ("foo","bar"))
+        self.assertEqual(r2.extras, ("bar","foo"))  # extras are normalized
+        self.assertEqual(hash(r1), hash(r2))
+        self.assertEqual(
+            hash(r1), hash(("twisted", packaging.specifiers.SpecifierSet(">=1.2"),
+                            frozenset(["foo","bar"])))
+        )
+
+    def testVersionEquality(self):
+        r1 = Requirement.parse("foo==0.3a2")
+        r2 = Requirement.parse("foo!=0.3a4")
+        d = Distribution.from_filename
+
+        self.assertTrue(d("foo-0.3a4.egg") not in r1)
+        self.assertTrue(d("foo-0.3a1.egg") not in r1)
+        self.assertTrue(d("foo-0.3a4.egg") not in r2)
+
+        self.assertTrue(d("foo-0.3a2.egg") in r1)
+        self.assertTrue(d("foo-0.3a2.egg") in r2)
+        self.assertTrue(d("foo-0.3a3.egg") in r2)
+        self.assertTrue(d("foo-0.3a5.egg") in r2)
+
+    def testSetuptoolsProjectName(self):
+        """
+        The setuptools project should implement the setuptools package.
+        """
+
+        self.assertEqual(
+            Requirement.parse('setuptools').project_name, 'setuptools')
+        # setuptools 0.7 and higher means setuptools.
+        self.assertEqual(
+            Requirement.parse('setuptools == 0.7').project_name, 'setuptools')
+        self.assertEqual(
+            Requirement.parse('setuptools == 0.7a1').project_name, 'setuptools')
+        self.assertEqual(
+            Requirement.parse('setuptools >= 0.7').project_name, 'setuptools')
+
+
+class ParseTests(TestCase):
+
+    def testEmptyParse(self):
+        self.assertEqual(list(parse_requirements('')), [])
+
+    def testYielding(self):
+        for inp,out in [
+            ([], []), ('x',['x']), ([[]],[]), (' x\n y', ['x','y']),
+            (['x\n\n','y'], ['x','y']),
+        ]:
+            self.assertEqual(list(pkg_resources.yield_lines(inp)),out)
+
+    def testSplitting(self):
+        sample = """
+                    x
+                    [Y]
+                    z
+
+                    a
+                    [b ]
+                    # foo
+                    c
+                    [ d]
+                    [q]
+                    v
+                    """
+        self.assertEqual(list(pkg_resources.split_sections(sample)),
+            [(None,["x"]), ("Y",["z","a"]), ("b",["c"]), ("d",[]), ("q",["v"])]
+        )
+        self.assertRaises(ValueError,list,pkg_resources.split_sections("[foo"))
+
+    def testSafeName(self):
+        self.assertEqual(safe_name("adns-python"), "adns-python")
+        self.assertEqual(safe_name("WSGI Utils"),  "WSGI-Utils")
+        self.assertEqual(safe_name("WSGI  Utils"), "WSGI-Utils")
+        self.assertEqual(safe_name("Money$$$Maker"), "Money-Maker")
+        self.assertNotEqual(safe_name("peak.web"), "peak-web")
+
+    def testSafeVersion(self):
+        self.assertEqual(safe_version("1.2-1"), "1.2.post1")
+        self.assertEqual(safe_version("1.2 alpha"),  "1.2.alpha")
+        self.assertEqual(safe_version("2.3.4 20050521"), "2.3.4.20050521")
+        self.assertEqual(safe_version("Money$$$Maker"), "Money-Maker")
+        self.assertEqual(safe_version("peak.web"), "peak.web")
+
+    def testSimpleRequirements(self):
+        self.assertEqual(
+            list(parse_requirements('Twis-Ted>=1.2-1')),
+            [Requirement('Twis-Ted',[('>=','1.2-1')], ())]
+        )
+        self.assertEqual(
+            list(parse_requirements('Twisted >=1.2, \ # more\n<2.0')),
+            [Requirement('Twisted',[('>=','1.2'),('<','2.0')], ())]
+        )
+        self.assertEqual(
+            Requirement.parse("FooBar==1.99a3"),
+            Requirement("FooBar", [('==','1.99a3')], ())
+        )
+        self.assertRaises(ValueError,Requirement.parse,">=2.3")
+        self.assertRaises(ValueError,Requirement.parse,"x\\")
+        self.assertRaises(ValueError,Requirement.parse,"x==2 q")
+        self.assertRaises(ValueError,Requirement.parse,"X==1\nY==2")
+        self.assertRaises(ValueError,Requirement.parse,"#")
+
+    def testVersionEquality(self):
+        def c(s1,s2):
+            p1, p2 = parse_version(s1),parse_version(s2)
+            self.assertEqual(p1,p2, (s1,s2,p1,p2))
+
+        c('1.2-rc1', '1.2rc1')
+        c('0.4', '0.4.0')
+        c('0.4.0.0', '0.4.0')
+        c('0.4.0-0', '0.4-0')
+        c('0post1', '0.0post1')
+        c('0pre1', '0.0c1')
+        c('0.0.0preview1', '0c1')
+        c('0.0c1', '0-rc1')
+        c('1.2a1', '1.2.a.1')
+        c('1.2.a', '1.2a')
+
+    def testVersionOrdering(self):
+        def c(s1,s2):
+            p1, p2 = parse_version(s1),parse_version(s2)
+            self.assertTrue(p1<p2, (s1,s2,p1,p2))
+
+        c('2.1','2.1.1')
+        c('2a1','2b0')
+        c('2a1','2.1')
+        c('2.3a1', '2.3')
+        c('2.1-1', '2.1-2')
+        c('2.1-1', '2.1.1')
+        c('2.1', '2.1post4')
+        c('2.1a0-20040501', '2.1')
+        c('1.1', '02.1')
+        c('3.2', '3.2.post0')
+        c('3.2post1', '3.2post2')
+        c('0.4', '4.0')
+        c('0.0.4', '0.4.0')
+        c('0post1', '0.4post1')
+        c('2.1.0-rc1','2.1.0')
+        c('2.1dev','2.1a0')
+
+        torture ="""
+        0.80.1-3 0.80.1-2 0.80.1-1 0.79.9999+0.80.0pre4-1
+        0.79.9999+0.80.0pre2-3 0.79.9999+0.80.0pre2-2
+        0.77.2-1 0.77.1-1 0.77.0-1
+        """.split()
+
+        for p,v1 in enumerate(torture):
+            for v2 in torture[p+1:]:
+                c(v2,v1)
+
+    def testVersionBuildout(self):
+        """
+        Buildout has a function in it's bootstrap.py that inspected the return
+        value of parse_version. The new parse_version returns a Version class
+        which needs to support this behavior, at least for now.
+        """
+        def buildout(parsed_version):
+            _final_parts = '*final-', '*final'
+
+            def _final_version(parsed_version):
+                for part in parsed_version:
+                    if (part[:1] == '*') and (part not in _final_parts):
+                        return False
+                return True
+            return _final_version(parsed_version)
+
+        self.assertTrue(buildout(parse_version("1.0")))
+        self.assertFalse(buildout(parse_version("1.0a1")))
+
+    def testVersionIndexable(self):
+        """
+        Some projects were doing things like parse_version("v")[0], so we'll
+        support indexing the same as we support iterating.
+        """
+        self.assertEqual(parse_version("1.0")[0], "00000001")
+
+    def testVersionTupleSort(self):
+        """
+        Some projects expected to be able to sort tuples against the return
+        value of parse_version. So again we'll add a warning enabled shim to
+        make this possible.
+        """
+        self.assertTrue(parse_version("1.0") < tuple(parse_version("2.0")))
+        self.assertTrue(parse_version("1.0") <= tuple(parse_version("2.0")))
+        self.assertTrue(parse_version("1.0") == tuple(parse_version("1.0")))
+        self.assertTrue(parse_version("3.0") > tuple(parse_version("2.0")))
+        self.assertTrue(parse_version("3.0") >= tuple(parse_version("2.0")))
+        self.assertTrue(parse_version("3.0") != tuple(parse_version("2.0")))
+        self.assertFalse(parse_version("3.0") != tuple(parse_version("3.0")))
+
+    def testVersionHashable(self):
+        """
+        Ensure that our versions stay hashable even though we've subclassed
+        them and added some shim code to them.
+        """
+        self.assertEqual(
+            hash(parse_version("1.0")),
+            hash(parse_version("1.0")),
+        )
+
+
+class ScriptHeaderTests(TestCase):
+    non_ascii_exe = '/Users/José/bin/python'
+    exe_with_spaces = r'C:\Program Files\Python33\python.exe'
+
+    def test_get_script_header(self):
+        if not sys.platform.startswith('java') or not is_sh(sys.executable):
+            # This test is for non-Jython platforms
+            expected = '#!%s\n' % nt_quote_arg(os.path.normpath(sys.executable))
+            self.assertEqual(get_script_header('#!/usr/local/bin/python'),
+                expected)
+            expected = '#!%s  -x\n' % nt_quote_arg(os.path.normpath(sys.executable))
+            self.assertEqual(get_script_header('#!/usr/bin/python -x'),
+                expected)
+            self.assertEqual(get_script_header('#!/usr/bin/python',
+                                               executable=self.non_ascii_exe),
+                             '#!%s -x\n' % self.non_ascii_exe)
+            candidate = get_script_header('#!/usr/bin/python',
+                executable=self.exe_with_spaces)
+            self.assertEqual(candidate, '#!"%s"\n' % self.exe_with_spaces)
+
+    def test_get_script_header_jython_workaround(self):
+        # This test doesn't work with Python 3 in some locales
+        if PY3 and os.environ.get("LC_CTYPE") in (None, "C", "POSIX"):
+            return
+
+        class java:
+            class lang:
+                class System:
+                    @staticmethod
+                    def getProperty(property):
+                        return ""
+        sys.modules["java"] = java
+
+        platform = sys.platform
+        sys.platform = 'java1.5.0_13'
+        stdout, stderr = sys.stdout, sys.stderr
+        try:
+            # A mock sys.executable that uses a shebang line (this file)
+            exe = os.path.normpath(os.path.splitext(__file__)[0] + '.py')
+            self.assertEqual(
+                get_script_header('#!/usr/local/bin/python', executable=exe),
+                '#!/usr/bin/env %s\n' % exe)
+
+            # Ensure we generate what is basically a broken shebang line
+            # when there's options, with a warning emitted
+            sys.stdout = sys.stderr = StringIO()
+            self.assertEqual(get_script_header('#!/usr/bin/python -x',
+                                               executable=exe),
+                             '#!%s  -x\n' % exe)
+            self.assertTrue('Unable to adapt shebang line' in sys.stdout.getvalue())
+            sys.stdout = sys.stderr = StringIO()
+            self.assertEqual(get_script_header('#!/usr/bin/python',
+                                               executable=self.non_ascii_exe),
+                             '#!%s -x\n' % self.non_ascii_exe)
+            self.assertTrue('Unable to adapt shebang line' in sys.stdout.getvalue())
+        finally:
+            del sys.modules["java"]
+            sys.platform = platform
+            sys.stdout, sys.stderr = stdout, stderr
+
+
+class NamespaceTests(TestCase):
+
+    def setUp(self):
+        self._ns_pkgs = pkg_resources._namespace_packages.copy()
+        self._tmpdir = tempfile.mkdtemp(prefix="tests-setuptools-")
+        os.makedirs(os.path.join(self._tmpdir, "site-pkgs"))
+        self._prev_sys_path = sys.path[:]
+        sys.path.append(os.path.join(self._tmpdir, "site-pkgs"))
+
+    def tearDown(self):
+        shutil.rmtree(self._tmpdir)
+        pkg_resources._namespace_packages = self._ns_pkgs.copy()
+        sys.path = self._prev_sys_path[:]
+
+    msg = "Test fails when /tmp is a symlink. See #231"
+    @skipIf(os.path.islink(tempfile.gettempdir()), msg)
+    def test_two_levels_deep(self):
+        """
+        Test nested namespace packages
+        Create namespace packages in the following tree :
+            site-packages-1/pkg1/pkg2
+            site-packages-2/pkg1/pkg2
+        Check both are in the _namespace_packages dict and that their __path__
+        is correct
+        """
+        sys.path.append(os.path.join(self._tmpdir, "site-pkgs2"))
+        os.makedirs(os.path.join(self._tmpdir, "site-pkgs", "pkg1", "pkg2"))
+        os.makedirs(os.path.join(self._tmpdir, "site-pkgs2", "pkg1", "pkg2"))
+        ns_str = "__import__('pkg_resources').declare_namespace(__name__)\n"
+        for site in ["site-pkgs", "site-pkgs2"]:
+            pkg1_init = open(os.path.join(self._tmpdir, site,
+                             "pkg1", "__init__.py"), "w")
+            pkg1_init.write(ns_str)
+            pkg1_init.close()
+            pkg2_init = open(os.path.join(self._tmpdir, site,
+                             "pkg1", "pkg2", "__init__.py"), "w")
+            pkg2_init.write(ns_str)
+            pkg2_init.close()
+        import pkg1
+        assert "pkg1" in pkg_resources._namespace_packages
+        try:
+            import pkg1.pkg2
+        except ImportError:
+            self.fail("Setuptools tried to import the parent namespace package")
+        # check the _namespace_packages dict
+        assert "pkg1.pkg2" in pkg_resources._namespace_packages
+        assert pkg_resources._namespace_packages["pkg1"] == ["pkg1.pkg2"]
+        # check the __path__ attribute contains both paths
+        expected = [
+            os.path.join(self._tmpdir, "site-pkgs", "pkg1", "pkg2"),
+            os.path.join(self._tmpdir, "site-pkgs2", "pkg1", "pkg2"),
+        ]
+        assert pkg1.pkg2.__path__ == expected