What are some examples of mocking in Java testing?

What are some examples of mocking in Java testing?

Mocking in Java testing is a technique used to simulate the behavior of complex objects. For example, using Mockito, you can create a mock object of a class and define its behavior for testing.

Can you show me a simple code example using Mockito?

Sure! Here's a simple example:

import static org.mockito.Mockito.*;

public class UserServiceTest {
    @Test
    public void testGetUser() {
        UserRepository mockRepo = mock(UserRepository.class);
        when(mockRepo.findById(1)).thenReturn(new User(1, "John Doe"));
        UserService userService = new UserService(mockRepo);

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

What are the benefits of using mocking in tests?

Mocking helps isolate the unit of work, reduces dependencies on external systems, and allows for testing edge cases without complex setups.