spring mvc：如何使用mockMvc测试Rx响应？

Question

我的控制器是：

import rx.Single;
...

@GetMapping
Single<List<MyType>> fetchFromDB() {
        return Single
                .fromCallable(() -> dao.fetch())
                .subscribeOn(Schedulers.io());
}

而且效果很好。但我不能测试它。我试过：

 MvcResult asyncResult = mvc.perform(get("/")).andReturn()

 String result = mvc
                    .perform(asyncDispatch(asyncResult))
                    .andReturn().getResponse().getContentAsString()

但它在以下方面失败了：

java.lang.IllegalStateException: Async result for handler [rx.Single<java.util.List<MyType>> MyController.fetchFromDB()] was not set during the specified timeToWait=-1

    at org.springframework.test.web.servlet.DefaultMvcResult.getAsyncResult(DefaultMvcResult.java:145)
    at org.springframework.test.web.servlet.DefaultMvcResult.getAsyncResult(DefaultMvcResult.java:121)
    at org.springframework.test.web.servlet.request.MockMvcRequestBuilders.asyncDispatch(MockMvcRequestBuilders.java:246)
    at MyControllerSpec.should fetch from db...

所以：如何测试rx。带spring mvc的单曲？

Answer 1

如果您使用MockMvcBuilders.webAppContextSetup（上下文）来代替，您可以在您的WebMvcConfigrerAdapter中添加处理程序：

public class Config extends WebMvcConfigurerAdapter {

    @Override
    public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
        returnValueHandlers.add(new SingleReturnValueHandler());
    }
}

Answer 2

我找到了答案。在创建mockMvc对象时，为Single添加一个处理程序：

return MockMvcBuilders.standaloneSetup(controller)
                .setCustomReturnValueHandlers(new SingleReturnValueHandler())