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: Now, what about the older version of the Mockito framework? Unit Testing Static Methods With Mockito. Same question with you, the documention seems to provide no link of static void method. PowerMock is a JUnit extension the leverages the possibilities of EasyMock and Mockito to mock static methods (and much more). Powermock – A Brief Introduction. does it support mocking static methods?. 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. If you are using Mockito 1.x versions then use powermock-api-mockito module. This will make sure that particular data is returned when Iterator’s class when a method is called. Next, we used Mockito static when a method to alter the results when a method of another class is called. Mocking static method with Mockito in older versions 2.x. In Objective-C, static methods, a.k.a class methods, can be mocked using OCMock. The code shown in examples below is available in GitHub java-samples/junit repository. This post is part of PowerMock series examples.. 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: 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. powermock-api-mockito2: This is the core PowerMock dependency and used to extend Mockito2 mocking framework. 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. So, I started modifying this case first to use a static factory method when I discovered Mockito can't mock a static. For Mockito, there is no direct support to mock private and static methods. The use of static methods in Java can be seen as somewhat controversial. On the last line, we verify the results. 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. Mockito spy() method. If we don't stub a method using spy, it will call the real method behavior. Here is an example of code that calls a static method on the Helper class: public class Foo { … the above is mock static method with string return type. This tutorial illustrates various uses of the standard static mock methods of the Mockito API. The answer is unfortunately NO. We need following PowerMock dependencies for mocking static methods in Mockito. Mockito provides a method to partially mock an object, which is known as the spy method. What follows is a sample code which calls the Iterator methods which invoke the when statement. 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. When using the spy method, there exists a real object, and spies or stubs are created of that real object. 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)); Post summary: Examples how to mock static methods in JUnit tests with PowerMock. 4. 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. 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