Not implemented
During your tests’ development, it can be helpful to partially develop a test. In this case the resulting test is not syntactically valid and shouldn’t be parsed. To avoid to comment it (and don’t display it in the test-suite), you can mark it as not-implemented. The test will be listed in the test-suite but will be ignored during execution. The difference with ignore is that an ignore test must be syntactically correct, it’s not the case for not-implemented.