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EDITING: test___loader__.py

from importlib import machinery
import sys
import types
import unittest
import warnings

from test.test_importlib import util

class SpecLoaderMock:

def find_spec(self, fullname, path=None, target=None):
        return machinery.ModuleSpec(fullname, self)

def create_module(self, spec):
        return None

def exec_module(self, module):
        pass

class SpecLoaderAttributeTests:

def test___loader__(self):
        loader = SpecLoaderMock()
        with util.uncache('blah'), util.import_state(meta_path=[loader]):
            module = self.__import__('blah')
        self.assertEqual(loader, module.__loader__)

(Frozen_SpecTests,
 Source_SpecTests
 ) = util.test_both(SpecLoaderAttributeTests, __import__=util.__import__)

class LoaderMock:

def find_module(self, fullname, path=None):
        return self

def load_module(self, fullname):
        sys.modules[fullname] = self.module
        return self.module

class LoaderAttributeTests:

def test___loader___missing(self):
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", ImportWarning)
            module = types.ModuleType('blah')
            try:
                del module.__loader__
            except AttributeError:
                pass
            loader = LoaderMock()
            loader.module = module
            with util.uncache('blah'), util.import_state(meta_path=[loader]):
                module = self.__import__('blah')
            self.assertEqual(loader, module.__loader__)

def test___loader___is_None(self):
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", ImportWarning)
            module = types.ModuleType('blah')
            module.__loader__ = None
            loader = LoaderMock()
            loader.module = module
            with util.uncache('blah'), util.import_state(meta_path=[loader]):
                returned_module = self.__import__('blah')
            self.assertEqual(loader, module.__loader__)

(Frozen_Tests,
 Source_Tests
 ) = util.test_both(LoaderAttributeTests, __import__=util.__import__)

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