Question

我目前正在尝试在普通Controller中测试一个简单的post方法，该方法将返回Mono重定向到其他页面或本例的主页。我尝试了各种不同的方法模拟组件，但我似乎总是在测试中返回空的Mono，所有正常工作都是通过表单提交完成的。

@Controller
public class AddNewEntryController {

private final EntryService service;

@PostMapping("/add-new-entry")
public Mono<String> addNewEntrySubmit(@ModelAttribute("timeEntry") Entry entry) {
    return service.addTimeKeepingEntry(Flux.just(entry)).then(Mono.just("redirect:/"));
   }
}

以及服务类别代码

public Mono<Void> addTimeKeepingEntry(Flux<Entry> entry) {
    return entry.flatMap(entry -> Mono.when(repository.save(entry).log("Save to DB"))
            .log("add entry when")).then().log("done");
}

和测试代码

@RunWith(SpringRunner.class)
@WebFluxTest(controllers = AddNewEntryController.class)
@Import({ThymeleafAutoConfiguration.class})
public class AddNewEntryControllerTest {

@Autowired
WebTestClient webTestClient;

@MockBean
EntryService service;

@Test
public void addNewEntrySubmit() {
    MultiValueMap<String, String> formData = new LinkedMultiValueMap<>();
    formData.add("month", month);
    formData.add("dateOfMonth", Integer.toString(21));
    formData.add("startTime", "09:00");

    when(service.addEntry(Flux.just(entry1))).thenReturn(Mono.empty());

    webTestClient.post().uri("/add-new-entry").body(BodyInserters.fromFormData(formData)).exchange().expectStatus().isSeeOther().expectHeader().valueEquals(HttpHeaders.LOCATION, "/");

每当我运行测试时，我总是得到一个Null指针，并且在调试之后，它指向Mono为Null。问题是我不确定哪个Mono或哪个步骤。

我得到的StackTrace如下。

java.lang.NullPointerException: null
at com.dbeer.timekeeping.UI.AddNewEntryController.addNewEntrySubmit(AddNewEntryController.java:47) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.web.reactive.result.method.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:243) ~[spring-webflux-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.reactive.result.method.InvocableHandlerMethod.lambda$invoke$0(InvocableHandlerMethod.java:138) ~[spring-webflux-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:118) [reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1083) ~[reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]
at reactor.core.publisher.MonoZip$ZipCoordinator.signal(MonoZip.java:247) ~[reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]
at reactor.core.publisher.MonoZip$ZipInner.onNext(MonoZip.java:329) ~[reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]
at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:185) ~[reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]

Answer 1

查看您的项目后，问题似乎出在控制器和html页面的命名一致性上。例如在header.html中，您具有链接add-entry的URL，但如果将标题中的URL更改为add-new-entry，则控制器具有add-new-entry。

作为清理，您应该使用thmyeleaf生成URL，而不是普通的href，就好像您以后再添加安全性一样，thymeleaf会将会话ID添加到URL等中

***********编辑拉了分支，可以复制*******

行

 given(service.addTimeKeepingEntry(Flux.just(new TimeKeepingEntry(month, 21, "Tuesday", "09:00", "30", "17:00", "7.5", false)))).willReturn(Mono.empty());

是问题所在，因为Mockito在此处匹配Object.equals，并且您尚未定义对对象意味着什么。

另一种方法是捕获传递到模拟中的对象例如

 @Captor
    private ArgumentCaptor<Flux<TimeKeepingEntry>> captor;

    @Test
    public void addNewEntrySubmit() {
        MultiValueMap<String, String> formData = new LinkedMultiValueMap<>();
        formData.add("month", month);
        formData.add("dateOfMonth", Integer.toString(21));
        formData.add("day", "Tuesday");
        formData.add("startTime", "09:00");
        formData.add("endTime", "17:00");
        formData.add("breakLength", "30");

        given(service.addTimeKeepingEntry(any())).willReturn(Mono.empty());

        webTestClient.post().uri("/add-new-entry")
                .body(BodyInserters.fromFormData(formData)).exchange().expectStatus().isSeeOther().expectHeader().valueEquals(HttpHeaders.LOCATION, "/");

        verify(service).addTimeKeepingEntry(captor.capture());
        TimeKeepingEntry timeKeepingEntry = captor.getValue().blockFirst();
        assertThat(timeKeepingEntry.getMonth()).isEqualTo(month);
        //and whatever else you want to test
    }

如何使用Spring Boot 2和WebFlux测试@Controller

1 个答案: