春季测试：BlogService中构造函数的参数0需要一个类型为BlogPostRepository的bean

Question

我有一个BlogPostRepository，它是JpaRepository接口：

@Repository
@Primary
public interface BlogPostRepository extends JpaRepository<BlogPost, Long> {
    @Query("SELECT p FROM BlogPost p WHERE slug = ?1")
    List<BlogPost> findBySlug(String slug);
}

根据以下错误，当我运行以下测试时，Spring无法加载BlogPostRepository：

Parameter 0 of constructor in com.example.demo.Services.BlogService required a bean of type 'com.example.demo.Repositories.BlogPostRepository' that could not be found.

我的测试如下：

@RunWith(SpringRunner.class)
@WebMvcTest(BlogController.class)
@ContextConfiguration(classes = {DemoApplication.class,BlogController.class})
public class BlogControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @Test
    public void test() throws Exception
    {
        MvcResult result = this.mockMvc.perform(get("/blog"))
                //.andDo(print())
                .andExpect(status().isOk())
                .andReturn();
        assertTrue(result.getResponse().getContentAsString().contains("Hello world"));
    }
}

问题是我无法将BlogPostRepository定义为bean，因为它是一个接口：

@Bean
public ExceptionFactory exceptionFactory()
{
    return new BlogPostRepository(); //this does not work! -> cannot construct interface
}

这仅在集成测试期间发生。