I want to write a test for my BookService. This is that test. I don't know why I get the below error all the time:
org.junit.jupiter.api.extension.ParameterResolutionException: No ParameterResolver registered for parameter
[com.mrfisherman.library.service.domain.BookService bookService] in constructor
[public com.mrfisherman.library.service.domain.BookServiceTest(com.mrfisherman.library.service.domain.BookService,
com.mrfisherman.library.persistence.repository.BookRepository)].
As you can see I don't use parametrized tests here. Thank you in advance!
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = Server.class)
class BookServiceTest {
private final BookService bookService;
private final BookRepository bookRepository;
public BookServiceTest(BookService bookService, BookRepository bookRepository) {
this.bookService = bookService;
this.bookRepository = bookRepository;
}
@Test
void saveBook() {
//given
Book book = new Book();
book.setTitle("Book 1");
book.setPublishYear(1990);
book.setType(BookFormat.REAL);
book.setIsbn("1234567890");
book.setDescription("Very good book");
book.setNumberOfPages(190);
book.setSummary("Very short summary");
book.setCategories(Set.of(new Category("horror"), new Category("drama")));
//when
bookService.saveBook(book);
//then
Optional<Book> loaded = bookRepository.findById(book.getId());
assertThat(loaded).isPresent();
}
}
It is parameterized. How is the test framework supposed to create a new instance of the BookServiceTest
class?
Ordinarily, test classes have a no-args constructor (at which point, the framework can just create a new instance without needing any additional information, such as 'how do I obtain an instance of bookService to pass to this constructor?').
In JUnit Jupiter, a ParameterResolutionException
is thrown whenever a test class constructor, lifecycle method (such as @BeforeEach
), or test method declares a parameter that cannot be resolved by one of the registered ParameterResolver
extensions.
Thus, a ParameterResolutionException
can be thrown even when you are not using a @ParameterizedTest
method.
When using @SpringBootTest
, the SpringExtension
is automatically registered for you. The SpringExtension
implements the ParameterResolver
extension API from JUnit Jupiter so that you can have beans from your ApplicationContext
injected into constructors and methods in your test class.
The easiest way to solve your issue is to annotate the BookServiceTest
constructor with @Autowired
.
For more information and alternative approaches, check out the Dependency Injection with SpringExtension
section of the Spring reference docs.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.