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import os, sys, string, random, tempfile, unittest
from test.test_support import run_unittest
class TestImport(unittest.TestCase):
def __init__(self, *args, **kw):
self.package_name = 'PACKAGE_'
while sys.modules.has_key(self.package_name):
self.package_name += random.choose(string.letters)
self.module_name = self.package_name + '.foo'
unittest.TestCase.__init__(self, *args, **kw)
def remove_modules(self):
for module_name in (self.package_name, self.module_name):
if sys.modules.has_key(module_name):
del sys.modules[module_name]
def setUp(self):
self.test_dir = tempfile.mktemp()
os.mkdir(self.test_dir)
sys.path.append(self.test_dir)
self.package_dir = os.path.join(self.test_dir,
self.package_name)
os.mkdir(self.package_dir)
open(os.path.join(self.package_dir, '__init__'+os.extsep+'py'), 'w')
self.module_path = os.path.join(self.package_dir, 'foo'+os.extsep+'py')
def tearDown(self):
for file in os.listdir(self.package_dir):
os.remove(os.path.join(self.package_dir, file))
os.rmdir(self.package_dir)
os.rmdir(self.test_dir)
self.assertNotEqual(sys.path.count(self.test_dir), 0)
sys.path.remove(self.test_dir)
self.remove_modules()
def rewrite_file(self, contents):
for extension in "co":
compiled_path = self.module_path + extension
if os.path.exists(compiled_path):
os.remove(compiled_path)
f = open(self.module_path, 'w')
f.write(contents)
f.close()
def test_package_import__semantics(self):
# Generate a couple of broken modules to try importing.
# ...try loading the module when there's a SyntaxError
self.rewrite_file('for')
try: __import__(self.module_name)
except SyntaxError: pass
else: raise RuntimeError, 'Failed to induce SyntaxError'
self.assert_(not sys.modules.has_key(self.module_name) and
not hasattr(sys.modules[self.package_name], 'foo'))
# ...make up a variable name that isn't bound in __builtins__
var = 'a'
while var in dir(__builtins__):
var += random.choose(string.letters)
# ...make a module that just contains that
self.rewrite_file(var)
try: __import__(self.module_name)
except NameError: pass
else: raise RuntimeError, 'Failed to induce NameError.'
module = __import__(self.module_name).foo
# ...now change the module so that the NameError doesn't
# happen
self.rewrite_file('%s = 1' % var)
reload(module)
self.assertEqual(getattr(module, var), 1)
def test_main():
run_unittest(TestImport)
if __name__ == "__main__":
test_main()
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