Web Reference: Mar 26, 2025 · In this quick tutorial, we’ll be looking at how to test if an exception is thrown and how to test if no exception is thrown using the JUnit library. We will, of course, make sure to cover both the JUnit 4 and JUnit 5 versions. Jul 23, 2025 · In this example project, we demonstrate how to assert exceptions in both JUnit 4 and JUnit 5 using a simple service class that throws an exception under specific conditions. In my view, tests should be for behaviour, not implementation. By testing that a specific method can throw an error, you are tying your tests directly to the implementation. I would argue that testing in the method shown above provides a more valuable test.
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