Spring Boot 集成测试。 如何测试“删除”方法？

Question

I'm using Spring Boot 2.5.6 and JUnit 4.13.2 . My task is to test the DELETE method

My REST controller:

@RestController
public class DomainEndpoint {

    private final SomeService service;

    @DeleteMapping("/domain/{id}")
    public void delete(@PathVariable long id) {
        service.delete(id);
    }
}

My test:

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@RunWith(SpringRunner.class)
public class DomainEndpointTest {

    @Autowired
    TestRestTemplate template;

    @MockBean
    SomeService service;

    @Test
    public void delete() {
        String url = "/domain/123";
        ResponseEntity<?> resp = template.exchange(url, HttpMethod.DELETE, new HttpEntity<>(""), String.class);
        assertEquals(HttpStatus.NO_CONTENT, resp.getStatusCode());
    }
}

As you can see, the only solution for testing the 'DELETE' method, which I found, is:

ResponseEntity<?> resp = template.exchange(url, HttpMethod.DELETE, new HttpEntity<>(""), String.class);

But params for body new HttpEntity<>("") and for return type String.class seem strange to me. Why should I use them? Can I do the same more straightway without passing unnecessary parameters?
On the other hand, TestRestTemplate template has a set of short and readable methods delete() . The problem with them - they return void and I can't check the response status code in this case.

The main question is how to test DELETE methods correctly?

Answer 1

Instead of passing in new HttpEntity<>("") HttpEntity has a special class variable you can use called HttpEntity.EMPTY for these situations. You can also use a return type of void.

ResponseEntity<Void> resp = template.exchange(url, HttpMethod.DELETE, HttpEntity.EMPTY, Void.class);

Answer 2

Two things you could improve:

1. Don't provide a request entity – it is marked as @Nullable
2. Use Void.class as return type to express that you don't expect any response body

ResponseEntity<Void> resp = restTemplate.exchange(url, HttpMethod.DELETE, null, Void.class);

Answer 3

Others have given different options but if you want to use the the delete method - it internally handles the http error by throwing runtime error as you can see here . You can check for HttpClientErrorException or HttpServerErrorException by using assertDoesNotThrow from JUnit5

Answer 4

在我看来 RestTemplate.delete 方法是可以使用的方法，返回类型为 void 但状态 2XX 以外的状态将引发异常。