@LazyProperty
    def extension(self):
        return self.name.split('.')[-1]
return cases with [exception expected, progresses, configs].
dataset/ETHPy150Open codeinn/vcs/vcs/nodes.py/FileNode.extension--crossover with--dataset/ETHPy150Open openstack/sahara/sahara/tests/unit/plugins/cdh/base_validation_tests.py/BaseValidationTestCase._get_test_cases