What is Mockito and how do I use it?

What is Mockito and how do I use it?

Mockito is a mocking framework for Java that allows you to create mock objects for testing. You can use it to simulate the behavior of complex objects.

Can you show me a simple example of how to create a mock object?

Sure! Here's a basic example:

import static org.mockito.Mockito.*;

List mockedList = mock(List.class);

when(mockedList.get(0)).thenReturn("first");

System.out.println(mockedList.get(0)); // prints "first"

How do I verify interactions with the mock?

You can verify interactions using the verify method. For example:

verify(mockedList).get(0);
``` This checks if `get(0)` was called on the mocked list.

What are some common use cases for Mockito?

Common use cases include unit testing, isolating dependencies, and testing interactions in complex systems.