How to test abstract class in Java with JUnit?

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If you have no concrete implementations of the class and the methods aren’t static whats the point of testing them? If you have a concrete class then you’ll be testing those methods as part of the concrete class’s public API.

I know what you are thinking “I don’t want to test these methods over and over thats the reason I created the abstract class”, but my counter argument to that is that the point of unit tests is to allow developers to make changes, run the tests, and analyze the results. Part of those changes could include overriding your abstract class’s methods, both protected and public, which could result in fundamental behavioral changes. Depending on the nature of those changes it could affect how your application runs in unexpected, possibly negative ways. If you have a good unit testing suite problems arising from these types changes should be apparent at development time.

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