def METHOD_NAME(self):
    # Fromat of the JSON file containing the test-cases:
    #
    # {
    #     "<unique_name_for_the_test>":{
    #         "desc":"<brief explanation of the test case>",
    #         "current_config":<the running config to be modified>,
    #         "patch":<the JsonPatch to apply>,
    #         "expected_error_substrings":<error substrings expected in failure output>
    #     },
    #     .
    #     .
    #     .
    # }
    data = Files.FEATURE_PATCH_APPLICATION_TEST_FAILURE
    for test_case_name in data:
        with self.subTest(name=test_case_name):
            self.run_single_failure_case_applier(data[test_case_name])