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from importlib import util
from . import util as test_util
import imp
import sys
import types
import unittest
class ModuleForLoaderTests(unittest.TestCase):
"""Tests for importlib.util.module_for_loader."""
def return_module(self, name):
fxn = util.module_for_loader(lambda self, module: module)
return fxn(self, name)
def raise_exception(self, name):
def to_wrap(self, module):
raise ImportError
fxn = util.module_for_loader(to_wrap)
try:
fxn(self, name)
except ImportError:
pass
def test_new_module(self):
# Test that when no module exists in sys.modules a new module is
# created.
module_name = 'a.b.c'
with test_util.uncache(module_name):
module = self.return_module(module_name)
self.assert_(module_name in sys.modules)
self.assert_(isinstance(module, types.ModuleType))
self.assertEqual(module.__name__, module_name)
def test_reload(self):
# Test that a module is reused if already in sys.modules.
name = 'a.b.c'
module = imp.new_module('a.b.c')
with test_util.uncache(name):
sys.modules[name] = module
returned_module = self.return_module(name)
self.assert_(sys.modules[name] is returned_module)
def test_new_module_failure(self):
# Test that a module is removed from sys.modules if added but an
# exception is raised.
name = 'a.b.c'
with test_util.uncache(name):
self.raise_exception(name)
self.assert_(name not in sys.modules)
def test_reload_failure(self):
# Test that a failure on reload leaves the module in-place.
name = 'a.b.c'
module = imp.new_module(name)
with test_util.uncache(name):
sys.modules[name] = module
self.raise_exception(name)
self.assert_(sys.modules[name] is module)
def test_main():
from test import support
support.run_unittest(ModuleForLoaderTests)
if __name__ == '__main__':
test_main()
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