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import os
import sys
import shutil
import string
import random
import tempfile
import unittest
from importlib.util import cache_from_source
from test.support import create_empty_file
class TestImport(unittest.TestCase):
def __init__(self, *args, **kw):
self.package_name = 'PACKAGE_'
while self.package_name in sys.modules:
self.package_name += random.choose(string.ascii_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 module_name in sys.modules:
del sys.modules[module_name]
def setUp(self):
self.test_dir = tempfile.mkdtemp()
sys.path.append(self.test_dir)
self.package_dir = os.path.join(self.test_dir,
self.package_name)
os.mkdir(self.package_dir)
create_empty_file(os.path.join(self.package_dir, '__init__.py'))
self.module_path = os.path.join(self.package_dir, 'foo.py')
def tearDown(self):
shutil.rmtree(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):
compiled_path = cache_from_source(self.module_path)
if os.path.exists(compiled_path):
os.remove(compiled_path)
with open(self.module_path, 'w') as f:
f.write(contents)
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.fail()?
self.assertNotIn(self.module_name, sys.modules)
self.assertFalse(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.ascii_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.')
# ...now change the module so that the NameError doesn't
# happen
self.rewrite_file('%s = 1' % var)
module = __import__(self.module_name).foo
self.assertEqual(getattr(module, var), 1)
if __name__ == "__main__":
unittest.main()