What is mocking in JUnit and how do I use it?

What is mocking in JUnit and how do I use it?

Mocking in JUnit is a technique used in unit testing to simulate the behavior of complex objects. It allows you to isolate the unit of work by replacing dependencies with mock objects.

Can you give me an example of how to create a mock object in JUnit?

Sure! You can use libraries like Mockito. For example, you can create a mock object like this: MyClass myMock = Mockito.mock(MyClass.class);.

How do I verify interactions with the mock object?

You can verify interactions using Mockito.verify(). For example: Mockito.verify(myMock).myMethod(); ensures that myMethod() was called on the mock.

What are some common pitfalls when using mocking?

Common pitfalls include over-mocking, which can lead to brittle tests, and not properly verifying interactions, which can result in false positives.