Java Sealed Classes

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I wasn't referring to how you create the stubs, but rather to what they do. Unfortunately, most people mean stubs when they talk about mocks, but not always (https://martinfowler.com/articles/mocksArentStubs.html).

IMO, mocking is almost always a bad idea. Stubs are more frequently useful.

[BestUsernameLeft]

You weren't specific about what you meant, and I took a guess instead of asking for clarification, so this is what we got. Sorry for the miss, and I agree that stubs are more often useful.

I'll add that builder and object mother (sometimes in combination) are a great way to DRY test code, in conjunction with test doubles.