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Editorial Team
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Asked: 2026-05-15T17:52:40+00:00

Let’s say I’ve got two classes, each fully tested. There’s duplication though, so I

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Let’s say I’ve got two classes, each fully tested. There’s duplication though, so I refactor the common code into a new class. Should I unit test that new class? If so, how?

Here’s the options I can see:

  1. don’t unit test the new class (it’s already fully tested by the original tests)
  2. copy+paste the original tests to the new test class
  3. move the original tests to the new test class and replace original tests with mocks
  4. leave original tests alone, but write more fine-grained tests in the new test class
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1 Answer

  1. Editorial Team

    If your refactored class is covered by existing tests, you are probably ok.

    Looking at your options, i would also do number 4. If you did some refactoring, you probably made something more generic than it was before. In that case, you could test the generic functionality in a generic manner. So I would do 4 if your refactored solution is more generic. If it is just moving code around to be DRY, i would probably do 1.

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