找不到带有 id:2 的书 - @InjectMocks 不工作 - SpringBoot

Question

我正在尝试测试 BookService class 和那个 class 方法 findBookById()

  @RunWith(MockitoJUnitRunner.class)
    class BookServiceTest {
    
    @InjectMocks
    BookService bookService;
    
    @Mock
    BookRepository bookRepository;
    
    @Mock
    private ModelMapper modelMapper;
    private BookDto bookDto = new BookDto();
    private Book book = new Book();
    private Book book1 = new Book();
    private List<Book> books = new ArrayList<>();
    private List<BookDto> bookList = new ArrayList<>();
    
    @Test
    void findBookById() {
    book.setId(2L);
    book.setTitle("Harry Potter");
    book.setAuthor("J. K. Rowling");
    book.setPublisher("Bloomsbury Publishing");
    book.setCategory(Category.CLASSIC);
    book.setTotalCount(10);
    book.setRented(0);
    
    bookDto = bookService.findBookById(2L);
         Mockito.when(bookRepository.findById(2L)).thenReturn(java.util.Optional.ofNullable(book));
assertNotNull(bookDto);
assertEquals("Harry Potter", bookDto.getTitle());
assertEquals(book, bookService.findBookById(2L));
        }

从这段代码我得到一个错误

com.example.library.exception.BookNotFoundException: Book with id:2 is not found.

更新

当我尝试做 assertEquals(book, bookService.findBookById(2L));

我收到以下错误：

org.opentest4j.AssertionFailedError: Expected :Book(id=2, title=Harry Potter, author=J. K. Rowling, publisher=Bloomsbury Publishing, category=CLASSIC, totalCount=10, rented=0) Actual :BookDto(id=2, title=Harry Potter, author=J. K. Rowling, publisher=Bloomsbury Publishing, category=CLASSIC, totalCount=10, rented=0)

我认为这是由于 bookService 的错误注入造成的。我在这里错过了什么？

Answer 1

您先调用 bookService.findBookById(2L)，然后存根 bookRepository.findById(2L)。存根必须先进行，然后再调用被测方法。

Mockito.when(bookRepository.findById(2L)).thenReturn(java.util.Optional.ofNullable(book));
var bookDto = bookService.findBookById(2L);
assertNotNull(bookDto);
assertEquals("Harry Potter", bookDto.getTitle());