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modulegraph / modulegraph_tests / test_pep420_nspkg.py

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"""
Tests that deal with pep420 namespace packages.

PEP 420 is new in Python 3.3
"""
import os
import shutil
import sys
import subprocess
import textwrap

if sys.version_info[:2] <= (2,6):
    import unittest2 as unittest
else:
    import unittest

from modulegraph import modulegraph

gRootDir = os.path.dirname(os.path.abspath(__file__))
gSrcDir = os.path.join(gRootDir, 'testpkg-pep420-namespace')

if sys.version_info[:2] >= (3,3):

    class TestPythonBehaviour (unittest.TestCase):
        def importModule(self, name):
            test_dir1 = os.path.join(gSrcDir, 'path1')
            test_dir2 = os.path.join(gSrcDir, 'path2')
            if '.' in name:
                script = textwrap.dedent("""\
                    import site
                    site.addsitedir(%r)
                    site.addsitedir(%r)
                    try:
                        import %s
                    except ImportError:
                        import %s
                    print (%s.__name__)
                """) %(test_dir1, test_dir2, name, name.rsplit('.', 1)[0], name)
            else:
                script = textwrap.dedent("""\
                    import site
                    site.addsitedir(%r)
                    site.addsitedir(%r)
                    import %s
                    print (%s.__name__)
                """) %(test_dir1, test_dir2, name, name)

            p = subprocess.Popen([sys.executable, '-c', script],
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT,
                    cwd=os.path.join(
                        os.path.dirname(os.path.abspath(__file__)),
                        'testpkg-relimport'),
            )
            data = p.communicate()[0]
            if sys.version_info[0] != 2:
                data = data.decode('UTF-8')
            data = data.strip()
            if data.endswith(' refs]'):
                data = data.rsplit('\n', 1)[0].strip()

            sts = p.wait()

            if sts != 0:
                print (data)
                self.fail("import of %r failed"%(name,))

            return data

        def testToplevel(self):
            m = self.importModule('package.sub1')
            self.assertEqual(m, 'package.sub1')

            m = self.importModule('package.sub2')
            self.assertEqual(m, 'package.sub2')

        def testSub(self):
            m = self.importModule('package.subpackage.sub')
            self.assertEqual(m, 'package.subpackage.sub')

            m = self.importModule('package.nspkg.mod')
            self.assertEqual(m, 'package.nspkg.mod')

    class TestModuleGraphImport (unittest.TestCase):
        if not hasattr(unittest.TestCase, 'assertIsInstance'):
            def assertIsInstance(self, value, types):
                if not isinstance(value, types):
                    self.fail("%r is not an instance of %r", value, types)

        def setUp(self):
            self.mf = modulegraph.ModuleGraph(path=[
                    os.path.join(gSrcDir, 'path1'),
                    os.path.join(gSrcDir, 'path2'),
                ] + sys.path)


        def testRootPkg(self):
            self.mf.import_hook('package')

            node = self.mf.findNode('package')
            self.assertIsInstance(node, modulegraph.Package)
            self.assertEqual(node.identifier, 'package')
            self.assertEqual(node.filename, '-')

        def testRootPkgModule(self):
            self.mf.import_hook('package.sub1')

            node = self.mf.findNode('package.sub1')
            self.assertIsInstance(node, modulegraph.SourceModule)
            self.assertEqual(node.identifier, 'package.sub1')

            self.mf.import_hook('package.sub2')
            node = self.mf.findNode('package.sub2')
            self.assertIsInstance(node, modulegraph.SourceModule)
            self.assertEqual(node.identifier, 'package.sub2')

        def testSubRootPkgModule(self):
            self.mf.import_hook('package.subpackage.sub')

            node = self.mf.findNode('package.subpackage.sub')
            self.assertIsInstance(node, modulegraph.SourceModule)
            self.assertEqual(node.identifier, 'package.subpackage.sub')

            node = self.mf.findNode('package')
            self.assertIsInstance(node, modulegraph.Package)

            self.mf.import_hook('package.nspkg.mod')
            node = self.mf.findNode('package.nspkg.mod')
            self.assertIsInstance(node, modulegraph.SourceModule)
            self.assertEqual(node.identifier, 'package.nspkg.mod')

else:
    # Check that PEP 420 is not implemented in python 3.2 and earlier
    # (and that modulegraph also doesn't do this)

    class TestPythonBehaviour (unittest.TestCase):
        def importModule(self, name):
            test_dir1 = os.path.join(gSrcDir, 'path1')
            test_dir2 = os.path.join(gSrcDir, 'path2')
            if '.' in name:
                script = textwrap.dedent("""\
                    import site
                    site.addsitedir(%r)
                    site.addsitedir(%r)
                    try:
                        import %s
                    except ImportError:
                        import %s
                    print (%s.__name__)
                """) %(test_dir1, test_dir2, name, name.rsplit('.', 1)[0], name)
            else:
                script = textwrap.dedent("""\
                    import site
                    site.addsitedir(%r)
                    site.addsitedir(%r)
                    import %s
                    print (%s.__name__)
                """) %(test_dir1, test_dir2, name, name)

            p = subprocess.Popen([sys.executable, '-c', script],
                    stdout=subprocess.PIPE,
                    stderr=subprocess.STDOUT,
                    cwd=os.path.join(
                        os.path.dirname(os.path.abspath(__file__)),
                        'testpkg-relimport'),
            )
            data = p.communicate()[0]
            if sys.version_info[0] != 2:
                data = data.decode('UTF-8')
            data = data.strip()
            if data.endswith(' refs]'):
                data = data.rsplit('\n', 1)[0].strip()

            sts = p.wait()

            if sts != 0:
                raise ImportError(name)

            return data

        def testToplevel(self):
            m = self.importModule('sys')
            self.assertEqual(m, 'sys')

            self.assertRaises(ImportError, self.importModule, 'package.sub1')
            self.assertRaises(ImportError, self.importModule, 'package.sub2')

        def testSub(self):
            self.assertRaises(ImportError, self.importModule, 'package.subpackage.sub')

    class TestModuleGraphImport (unittest.TestCase):
        if not hasattr(unittest.TestCase, 'assertIsInstance'):
            def assertIsInstance(self, value, types):
                if not isinstance(value, types):
                    self.fail("%r is not an instance of %r", value, types)

        def setUp(self):
            self.mf = modulegraph.ModuleGraph(path=[
                    os.path.join(gSrcDir, 'path1'),
                    os.path.join(gSrcDir, 'path2'),
                ] + sys.path)


        def testRootPkg(self):
            self.assertRaises(ImportError, self.mf.import_hook, 'package')

            node = self.mf.findNode('package')
            self.assertIs(node, None)

        def testRootPkgModule(self):
            self.assertRaises(ImportError, self.mf.import_hook, 'package.sub1')

            node = self.mf.findNode('package.sub1')
            self.assertIs(node, None)

            node = self.mf.findNode('package.sub2')
            self.assertIs(node, None)

if __name__ == "__main__":
    unittest.main()