def METHOD_NAME(self):
    self.fw_one.list_of_all_included_files.append('foo')
    self.fw_two.list_of_all_included_files.append('foo')
    result = self.c_plugin._get_intersection_of_files([self.fw_one, self.fw_two])
    assert isinstance(result, dict), 'result is not a dict'
    assert 'all' in result, 'all field not present'
    assert result['all'] == ['foo'], 'intersection not correct'