在SpringBoot环境中使用Mockito进行单元测试的示例详解

@SpringBootTest
public class BookServiceTest {

    @Mock
    private BookRepository bookRepository;

    @InjectMocks
    private BookService bookService;

    @BeforeEach
    public void setup() {
        MockitoAnnotations.openMocks(this);
    }

    @Test
    public void testFindBookById() {
        Book mockBook = new Book(1L, "Mockito in Action", "John Doe");
        when(bookRepository.findById(1L)).thenReturn(Optional.of(mockBook));

        Book result = bookService.findBookById(1L);

        assertEquals("Mockito in Action", result.getTitle());
    }
}

@WebMvcTest(BookController.class)
public class BookControllerTest {

    @MockBean
    private BookService bookService;

    @Autowired
    private MockMvc mockMvc;

    @Test
    public void testGetBook() throws Exception {
        Book mockBook = new Book(1L, "Mockito for Beginners", "Jane Doe");
        when(bookService.findBookById(1L)).thenReturn(mockBook);

        mockMvc.perform(get("/books/1"))
               .andExpect(status().isOk())
               .andExpect(jsonPath("$.title").value("Mockito for Beginners"));
    }
}

@SpringBootTest
public class BookServiceTest {

    @Mock
    private BookRepository bookRepository;

    @InjectMocks
    private BookService bookService;

    @Test
    public void testBookNotFound() {
        when(bookRepository.findById(1L)).thenReturn(Optional.empty());

        assertThrows(BookNotFoundException.class, () -> {
            bookService.findBookById(1L);
        });
    }
}

@SpringBootTest
public class ExternalServiceTest {

    @Mock
    private RestTemplate restTemplate;

    @InjectMocks
    private ExternalService externalService;

    @Test
    public void testGetExternalData() {
        String response = "{\"key\":\"value\"}";
        when(restTemplate.getForObject("http://external-api.com/data", String.class))
                .thenReturn(response);

        String result = externalService.getExternalData();

        assertEquals("{\"key\":\"value\"}", result);
    }
}

@SpringBootTest
public class UserServiceTest {

    @Mock
    private UserRepository userRepository;

    @InjectMocks
    private UserService userService;

    @Test
    public void testCreateUser() {
        User user = new User("JohnDoe", "john@doe.com");

        userService.createUser(user);

        ArgumentCaptor<User> userArgumentCaptor = ArgumentCaptor.forClass(User.class);
        verify(userRepository).save(userArgumentCaptor.capture());
        User capturedUser = userArgumentCaptor.getValue();

        assertEquals("JohnDoe", capturedUser.getUsername());
    }
}

@SpringBootTest
public class UtilityServiceTest {

    @Test
    public void testStaticMethod() {
        try (MockedStatic<UtilityClass> mockedStatic = Mockito.mockStatic(UtilityClass.class)) {
            mockedStatic.when(() -> UtilityClass.staticMethod("input")).thenReturn("mocked output");

            String result = UtilityService.callStaticMethod("input");

            assertEquals("mocked output", result);
        }
    }
}

@SpringBootTest
public class ProductServiceTest {

    @Mock
    private ProductRepository productRepository;

    @InjectMocks
    private ProductService productService;

    @Test
    public void testProductAvailability() {
        when(productRepository.checkAvailability(anyInt()))
                .thenReturn(true)
                .thenReturn(false);

        assertTrue(productService.isProductAvailable(123));
        assertFalse(productService.isProductAvailable(123));
    }
}

@SpringBootTest
public class NotificationServiceTest {

    @Mock
    private EmailClient emailClient;

    @InjectMocks
    private NotificationService notificationService;

    @Test
    public void testSendEmail() {
        notificationService.sendEmail("hello@example.com", "Hello");

        verify(emailClient).sendEmail(anyString(), eq("Hello"));
    }
}

@SpringBootTest
public class AuditServiceTest {

    @Mock
    private AuditLogger auditLogger;

    @InjectMocks
    private UserService userService;

    @Test
    public void testUserCreationWithAudit() {
        doNothing().when(auditLogger).log(anyString());

        userService.createUser(new User("JaneDoe", "jane@doe.com"));

        verify(auditLogger).log(contains("User created:"));
    }
}

@SpringBootTest
public class CacheServiceTest {

    @Mock
    private CacheManager cacheManager;

    @InjectMocks
    private ProductService productService;

    @Test
    public void testCaching() {
        Product mockProduct = new Product("P123", "Mock Product");

        when(cacheManager.getFromCache(any(), any())).thenReturn(mockProduct);

        Product result = productService.getProduct("P123");

        assertEquals("Mock Product", result.getName());
    }
}

@SpringBootTest
public class OrderServiceTest {

    @Spy
    private OrderProcessor orderProcessor;

    @InjectMocks
    private OrderService orderService;

    @Test
    public void testOrderProcessing() {
        Order order = new Order("O123", 100.0);
        doReturn(true).when(orderProcessor).validateOrder(order);

        boolean result = orderService.processOrder(order);

        assertTrue(result);
    }
}

@SpringBootTest
public class TransactionServiceTest {

    @Mock
    private Database database;

    @InjectMocks
    private TransactionService transactionService;

    @Test
    public void testTransactionOrder() {
        transactionService.performTransaction();

        InOrder inOrder = inOrder(database);
        inOrder.verify(database).beginTransaction();
        inOrder.verify(database).commitTransaction();
    }
}