self = <coalib.testing.LocalBearTestHelper.verify_local_bear.<locals>.LocalBearTest testMethod=test_invalid_files>

    def test_invalid_files(self):
        self.assertIsInstance(invalid_files, (list, tuple))
        for file in invalid_files:
            self.check_validity(self.uut,
                                file.splitlines(keepends=True),
                                filename,
                                valid=False,
                                force_linebreaks=force_linebreaks,
                                create_tempfile=create_tempfile,
>                               tempfile_kwargs=tempfile_kwargs)

../coala-venv/lib/python3.5/site-packages/coalib/testing/LocalBearTestHelper.py:344:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
../coala-venv/lib/python3.5/site-packages/coalib/testing/LocalBearTestHelper.py:135: in check_validity
    settings=settings,
../coala-venv/lib/python3.5/site-packages/coalib/testing/LocalBearTestHelper.py:175: in check_invalidity
    self.assertNotEqual(len(bear_output), 0, msg=msg)
E   AssertionError: 0 == 0 : The local bear 'CMakeLintBear' yields no result although it should.