In Mock JUnit tests with Mockito example post, I have shown how and why to use Mockito java mocking framework to create good unit tests. As with other articles focused on the Mockito framework (like Mockito Verify or Mockito When/Then ), the MyList class shown below will be used as the collaborator to be mocked in test cases: The code shown in examples below is available in GitHub java-samples/junit repository. Mockito provides a method to partially mock an object, which is known as the spy method. If we don't stub a method using spy, it will call the real method behavior. Next, we used Mockito static when a method to alter the results when a method of another class is called. Mocking static methods has just been made possible in Mockito 3.4.0, which goes really well with JUnit 5 and reduces reliance on PowerMock and JUnit Vintage. Here is an example of code that calls a static method on the Helper class: public class Foo { … does it support mocking static methods?. Mockito spy() method. static methods could be mocked only using an inline way, after try-with-resource block behavior of the static method will be as originally implemented. If you are using Mockito 1.x versions then use powermock-api-mockito module. PowerMock is a JUnit extension the leverages the possibilities of EasyMock and Mockito to mock static methods (and much more). This post is part of PowerMock series examples.. when is a static method of the Mockito class and it returns an OngoingStubbing (T is the return type of the method that we are mocking, in this case it is boolean) So if we just extract that out to get hold of the stub, it looks like this: OngoingStubbing stub = when(dao.save(customer)); Same question with you, the documention seems to provide no link of static void method. the above is mock static method with string return type. Unit testing can be hard especially when you need to test a method that is static, this tutorial will help you to easily mock static methods. Mocking static method with Mockito in older versions 2.x. We need following PowerMock dependencies for mocking static methods in Mockito. Unit Testing Static Methods With Mockito. This tutorial illustrates various uses of the standard static mock methods of the Mockito API. What follows is a sample code which calls the Iterator methods which invoke the when statement. The answer is unfortunately NO. The use of static methods in Java can be seen as somewhat controversial. For Mockito, there is no direct support to mock private and static methods. When using the spy method, there exists a real object, and spies or stubs are created of that real object. Let’s assume the following setup: Our unit under test is the class Calculator which just delegates the addition of two integers to MathUtil which offers only static methods: On the last line, we verify the results. Now, what about the older version of the Mockito framework? In Objective-C, static methods, a.k.a class methods, can be mocked using OCMock. my question is how to mock static with void return type, not the try with resources block, of course i know that it should in a try with resources block, but that's not my question. Post summary: Examples how to mock static methods in JUnit tests with PowerMock. So, I started modifying this case first to use a static factory method when I discovered Mockito can't mock a static. Moreover, caving to the "create an instance" approach just to do my unit tests means that I have a layer that has knowledge of something it doesn't need to know about. 4. 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