java - spring-mvc:如何使用 mockMvc 测试 Rx 响应？

Question

我的 Controller 是:

import rx.Single;
...

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

而且效果很好。但我无法测试它。我试过:

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

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

但它失败了:

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...

那么:如何使用 spring mvc 测试 rx.Single？

Answer 1

我找到了答案。当您创建 mockMvc 对象时，为 Single 添加一个处理程序:

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