How do I use Mockito for unit testing in Java?

How do I use Mockito for unit testing in Java?

Mockito is a popular framework for creating mock objects in Java. You can use it to simulate the behavior of complex objects in your unit tests.

Can you show me a simple example of mocking a service?

Sure! Here's a basic example:

import static org.mockito.Mockito.*;

public class UserServiceTest {
    @Test
    public void testGetUser() {
        UserRepository mockRepo = mock(UserRepository.class);
        UserService userService = new UserService(mockRepo);

        when(mockRepo.findById(1)).thenReturn(new User(1, "John Doe"));

        User user = userService.getUser(1);
        assertEquals("John Doe", user.getName());
    }
}

What are the benefits of using Mockito?

Mockito allows you to isolate the unit of work by mocking dependencies, making your tests faster and more reliable.

Are there any limitations to using Mockito?

Yes, Mockito cannot mock final classes or static methods directly, and it may require additional setup for complex scenarios.