Unit testing helps us to cover different scenarios and it is a way to ensure the applications behave as expected under certain circumstances. Most of the time it is easy to test your classes and methods, but sometimes you need to mock certain services or methods to isolate your target. Mockito is a good library to help you with that. It can easily create mocked or partially mocked objects for you with Mockito#mock or with Mockito#spy.
There are some cases that we also want to mock static methods of a particular utility class, so how can we accomplish that? Well by using the Mockito mockStatic method. Lets take an example by using the following AnimalUtils, Dog objects and Animal Interface: