Refactor unit tests?

When we work with legacy code and need to do changes, we first write tests on the current behavior. That way we can implement new changes with confidence. We can even refactor the code.

Legacy code is often bad code, and after some refactoring the code may be simpler, easier to test. Since the refactor has been validated by the tests should we also refactor the tests if we can make them simpler/clearer or keep them as they were written?

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Author: JayZ