Hey Invaders! 👽
#100daysofcode day 12, I continued working on my JUnit course and started section 8: Mockito. Today was all about Mockito magic! 🧙♂️ I learned how to integrate Mockito into my projects, injecting dependencies, and using annotations like @InjectMocks and @Mock.
Here's a quick rundown of what I explored:
Creating mock objects to simulate dependencies.
Stubbing methods using
when()and built-in matchers likeany().Verifying method calls using
verify().Exception stubbing for handling specific scenarios.
Here is a code snippet on how to test dependency injections and how I created the tests using mockito when!
@ExtendWith(MockitoExtension.class)
public class UserServiceTest {
@InjectMocks //the service that takes the dependency injections
UserServiceImpl userService;
@Mock //the dependency that gets injected
UsersRepository usersRepository;
@Mock
EmailVerificationServiceImpl emailVerificationService;
String firstName;
String lastName;
String email;
String password;
String repeatPassword;
@BeforeEach
void init() {
userService = new UserServiceImpl(usersRepository); // Inject mock repository
firstName = "ari";
lastName = "vanegas";
email = "[email protected]";
password = "1234567";
repeatPassword = "1234567";
}
@DisplayName("If save() method causes RuntimeException, a UserServiceException is thrown")
@Test
void testCreateUser_whenSaveMethodThrowsException_thenThrowsUserServiceException(){
// Arrange: Mock the repository to throw a RuntimeException when saving
when(usersRepository.save(any(User.class))).thenThrow(RuntimeException.class);
// Act & Assert: Ensure that a UserServiceException is thrown
assertThrows(UserServiceException.class, () -> {
userService.createUser(firstName, lastName, email, password, repeatPassword);
}, "should have thrown UserServiceException instead");
}
}Mockito is a powerful tool for testing, and I'm excited to leverage it for more robust and effective unit tests! For more on what I implemented for today you can checkout my Git Hub!
Stay tuned for more updates on my #100DaysOfCode journey. Happy coding! 💻✨