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There is a bit of a dual relationship between testing and refactoring. On one hand, good test coverage allows you to refactor with confidence: the tests tell you whether or not you broke things. On the other hand, if the refactoring you want to execute has a large impact on the test suite, you're held back in two ways: the extra work required to rework the tests, and the possibility of introducing bugs in the tests while reworking them, which reduces your refactoring confidence.