spring-mvc：如何使用mockMvc測試Rx響應？

Question

我的控制器：

import rx.Single; 
... 

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

和它完美的作品。但我無法測試它。我想：

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

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

，但它失敗：

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... 

如此：如何與Spring MVC的測試rx.Single？

Answer 1

我找到了答案。當您創建mockMvc對象，添加一個處理Single：

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

Answer 2

如果使用MockMvcBuilders.webAppContextSetup(context)相反，你可以添加處理程序在你的WebMvcConfigurerAdapter：

public class Config extends WebMvcConfigurerAdapter { 

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