Springboot Verification

@ExtendWith(MockitoExtension.class)class UserServiceTest {
  @Mock private UserRepository userRepository;  @InjectMocks private UserService userService;
  @Test  void createUser_validInput_returnsUser() {    var dto = new CreateUserDto("Alice", "[email protected]");    var expected = new User(1L, "Alice", "[email protected]");    when(userRepository.save(any(User.class))).thenReturn(expected);
    var result = userService.create(dto);
    assertThat(result.name()).isEqualTo("Alice");    verify(userRepository).save(any(User.class));  }
  @Test  void createUser_duplicateEmail_throwsException() {    var dto = new CreateUserDto("Alice", "[email protected]");    when(userRepository.existsByEmail(dto.email())).thenReturn(true);
    assertThatThrownBy(() -> userService.create(dto))        .isInstanceOf(DuplicateEmailException.class);  }}

@SpringBootTest@Testcontainersclass UserRepositoryIntegrationTest {
  @Container  static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:16-alpine")      .withDatabaseName("testdb");
  @DynamicPropertySource  static void configureProperties(DynamicPropertyRegistry registry) {    registry.add("spring.datasource.url", postgres::getJdbcUrl);    registry.add("spring.datasource.username", postgres::getUsername);    registry.add("spring.datasource.password", postgres::getPassword);  }
  @Autowired private UserRepository userRepository;
  @Test  void findByEmail_existingUser_returnsUser() {    userRepository.save(new User("Alice", "[email protected]"));
    var found = userRepository.findByEmail("[email protected]");
    assertThat(found).isPresent();    assertThat(found.get().getName()).isEqualTo("Alice");  }}

@WebMvcTest(UserController.class)class UserControllerTest {
  @Autowired private MockMvc mockMvc;  @MockBean private UserService userService;
  @Test  void createUser_validInput_returns201() throws Exception {    var user = new UserDto(1L, "Alice", "[email protected]");    when(userService.create(any())).thenReturn(user);
    mockMvc.perform(post("/api/users")            .contentType(MediaType.APPLICATION_JSON)            .content("""                {"name": "Alice", "email": "[email protected]"}                """))        .andExpect(status().isCreated())        .andExpect(jsonPath("$.name").value("Alice"));  }
  @Test  void createUser_invalidEmail_returns400() throws Exception {    mockMvc.perform(post("/api/users")            .contentType(MediaType.APPLICATION_JSON)            .content("""                {"name": "Alice", "email": "not-an-email"}                """))        .andExpect(status().isBadRequest());  }}