Integration tests Spring Boot 3

I got bit confused trying to understand what the best way to run integration tests for a Spring Boot 3 rest api application (data jpa,spring mvc). For unit test I use:

  @WebMvcTest
  @AutoConfigureMockMvc(addFilters = false)
  class PersonControllerTest {
@MockBean
private PersonService personService;
@MockBean
private SkillService skillService;
@Autowired
private MockMvc mockMvc;
@Test
void whenGetPersonListThenStatusOk() throws Exception {
    PersonListDto personListDto = new PersonListDto(new ArrayList<>());
    when(personService.getAllPersons()).thenReturn(personListDto);
    mockMvc.perform(get(BASE_URL))
            .andExpect(status().isOk())
            .andExpect(content().string("{\"persons\":[]}"));
}

But for integration test I have no idea what to use. Can I use mockMvc(is it only for unittest)? or Webclient(as I understood is only for reactive app and require jetty)?

So the goal would be to run a real http request involving all application layers and server.

> So the goal would be to run a real http request involving all application layers and server.

For real http requests you can use
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT). This will start your application on random free port and also autoconfigure TestRestTemplate.

@Autowired private TestRestTemplate restTemplate;

It is not required to specify the port (nor host) in your test code as it is preconfigured.

ResponseEntity<String> response = restTemplate.exchange("/api/something", HttpMethod.POST, requestEntity, String.class);

Example:

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class MyIntegrationTest {
@Autowired private TestRestTemplate restTemplate;
@Test
publiс void myTest() {
    ResponseEntity<String> response = restTemplate.exchange("/api/something", HttpMethod.POST, requestEntity, String.class);
    // ...
}

For WebClient (or WebTestClient) you will need webflux.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-webflux</artifactId>
    <scope>test</scope>
</dependency>

Which will also make it available through auto-wiring.
@Autowired WebTestClient webClient;. Although you should consider if it is worth adding this dependency just for WebTestClient.

You are 99% of the way there with the test you have. The key that you're missing is that @WebMvcTest will not create the full spring context that contains your service beans. I will assume that you're on Junit5, given that you're using Spring 3. Here's an example of a MockMvc test that will inject actual service instances into your controller.

@WebMvcTest
@ExtendWith(SpringExtension.class) // SpringExtension will spin up the full Spring context
public class PersonController_IT {
	@Autowired
	private MockMvc mockMvc;
	
	@Test
	void whenGetPersonListThenStatusOk() throws Exception {
		PersonListDto personListDto = new PersonListDto(new ArrayList<>());
		mockMvc.perform(get(BASE_URL))
				.andExpect(status().isOk())
				.andExpect(content().string("{\"persons\":[]}"));
	}
}