Spring-如何使用ApplicationEventPublisher依赖项测试控制器？

我有一个正在发布事件的控制器

@RestController
public class Controller
{
    @Autowired
    private ApplicationEventPublisher publisher;

    @GetMapping("/event")
    public void get()
    {
        publisher.publishEvent(new Event());
    }
}

现在我想测试事件是否已发布。首先，我尝试使用ApplicationEventPublisher@MockBean并验证方法调用。但这并不能根据实际情况发挥作用

所以我是这样做的：

@RunWith(SpringRunner.class)
@WebMvcTest(controllers = Controller.class)
public class ControllerTest
{
    @Autowired
    private MockMvc mockMvc;

    @Test
    public void getTest() throws Exception
    {
        this.mockMvc.perform(get("/").contentType(MediaType.APPLICATION_JSON)
                    .andExpect(status().isOk());
        assertNotNull(Listener.event);
    }

    @TestConfiguration
    static class Listener
    {
        public static Event event;

        @EventListener
        void listen ( Event incoming )
        {
            event = incoming;
        }
    }
}

---

对于这个常用用例，有没有更简单的方法？

您可以这样做

@RunWith(SpringRunner.class)
public class ControllerTest {

    private MockMvc mockMvc;

    @MockBean
    private ApplicationEventPublisher publisher;

    @Before
    public void setup() {
        Controller someController= new Controller(publisher);
        mockMvc = MockMvcBuilders.standaloneSetup(someController).build();
    }

    @Test
    public void getTest() throws Exception
    {
        ArgumentCaptor<Event> argumentCaptor = ArgumentCaptor.forClass(Event.class);
        doAnswer(invocation -> {
            Event value = argumentCaptor.getValue();
             //assert if event is correct
            return null;
        }).when(publisher).publishEvent(argumentCaptor.capture());  

        this.mockMvc.perform(get("/").contentType(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk());

        verify(publisher, times(1)).publishEvent(any(Event.class));
    }

}  

---

另一种可能性是在测试中使用反射将控制器上的ApplicationEventPublisher实例替换为模拟实例：

public class ControllerTest {
...
    // Collect your controller
    @Autowired
    private Controller controller;

    // Use the mock publisher
    @MockBean
    private ApplicationEventPublisher publisherMock;

    // E.g. in setup set the mock publisher on your controller
    @Before
    public void setup() {
        ReflectionTestUtils.setField(controller, "publisher", publisherMock);
    }
...

---

这是一个非常好的方法。我不知道：

mockMvc=MockMvcBuilders.standaloneSetup（someController.build（）只是这一部分有点烦人：
@SpringBootTest
中的
classes=MockServletContext.class
。是否没有内置注释来启用此行为？@davidxxx实际上根本不需要它。即使没有它，它也能工作。编辑了我的回答，这样更好。好吧，关键是手动将模拟发布者注入控制器。所以您不需要MockBean，只需要Mock annotation.ya，
@Mock
就足够了。我们必须这样做，因为你已经提到的错误
public class ControllerTest {
...
    // Collect your controller
    @Autowired
    private Controller controller;

    // Use the mock publisher
    @MockBean
    private ApplicationEventPublisher publisherMock;

    // E.g. in setup set the mock publisher on your controller
    @Before
    public void setup() {
        ReflectionTestUtils.setField(controller, "publisher", publisherMock);
    }
...