In JUnit-5, How do I mock a static method that returns void? Can we use import org.mockito.MockedStatic?

Question

I have a few 3rd parties static util methods in my project, some of them just pass or throw an exception. There are a lot of examples out there on how to mock a static method using PowerMock but Junit5 doesn't support PowerMock, which has a return type other than void. But how can I mock a static method that returns void to just "doNothing()"?

Answer 1

Don't mock it. From your minimal description, you could replace the usage sites with Consumer and provide a mock of that. (You can even initialize the fields with method references to the static methods and just have setter methods to override them.)

However, the fact that the class under test calls these static methods is usually just an implementation detail that the test shouldn't care about, only checking observable behavior.

Answer 2

在其上构建一个包装器类，调用包装器方法，如果您可以执行不同的行为，或者可以模拟调用类/方法的包装器，则您可以在测试中使用不同的包装器，