81 lines
2.7 KiB
Python
81 lines
2.7 KiB
Python
import os
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import sys
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import shutil
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import string
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import random
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import tempfile
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import unittest
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from importlib.util import cache_from_source
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from test.support import create_empty_file
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class TestImport(unittest.TestCase):
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def __init__(self, *args, **kw):
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self.package_name = 'PACKAGE_'
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while self.package_name in sys.modules:
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self.package_name += random.choice(string.ascii_letters)
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self.module_name = self.package_name + '.foo'
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unittest.TestCase.__init__(self, *args, **kw)
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def remove_modules(self):
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for module_name in (self.package_name, self.module_name):
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if module_name in sys.modules:
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del sys.modules[module_name]
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def setUp(self):
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self.test_dir = tempfile.mkdtemp()
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sys.path.append(self.test_dir)
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self.package_dir = os.path.join(self.test_dir,
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self.package_name)
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os.mkdir(self.package_dir)
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create_empty_file(os.path.join(self.package_dir, '__init__.py'))
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self.module_path = os.path.join(self.package_dir, 'foo.py')
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def tearDown(self):
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shutil.rmtree(self.test_dir)
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self.assertNotEqual(sys.path.count(self.test_dir), 0)
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sys.path.remove(self.test_dir)
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self.remove_modules()
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def rewrite_file(self, contents):
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compiled_path = cache_from_source(self.module_path)
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if os.path.exists(compiled_path):
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os.remove(compiled_path)
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with open(self.module_path, 'w') as f:
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f.write(contents)
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def test_package_import__semantics(self):
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# Generate a couple of broken modules to try importing.
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# ...try loading the module when there's a SyntaxError
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self.rewrite_file('for')
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try: __import__(self.module_name)
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except SyntaxError: pass
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else: raise RuntimeError('Failed to induce SyntaxError') # self.fail()?
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self.assertNotIn(self.module_name, sys.modules)
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self.assertFalse(hasattr(sys.modules[self.package_name], 'foo'))
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# ...make up a variable name that isn't bound in __builtins__
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var = 'a'
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while var in dir(__builtins__):
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var += random.choice(string.ascii_letters)
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# ...make a module that just contains that
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self.rewrite_file(var)
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try: __import__(self.module_name)
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except NameError: pass
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else: raise RuntimeError('Failed to induce NameError.')
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# ...now change the module so that the NameError doesn't
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# happen
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self.rewrite_file('%s = 1' % var)
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module = __import__(self.module_name).foo
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self.assertEqual(getattr(module, var), 1)
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if __name__ == "__main__":
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unittest.main()
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