在测试AsyncRestTemplate时，防止已经声明异常的期望

Question

如何测试AsyncRestTemplate请求并避免java.lang.IllegalStateException: Expectations already declared例外？对于单个测试用例，异常抛出不一致。

Java.lang.IllegalStateException: Expectations already declared at org.springframework.util.Assert.state(Assert.java:70) at org.springframework.test.web.client.SimpleRequestExpectationManager.afterExpectationsDeclared(SimpleRequestExpectationManager.java:47) at org.springframework.test.web.client.AbstractRequestExpectationManager.validateRequest(AbstractRequestExpectationManager.java:73) at org.springframework.test.web.client.MockRestServiceServer$MockClientHttpRequestFactory$1.executeInternal(MockRestServiceServer.java:289) at org.springframework.mock.http.client.MockClientHttpRequest.execute(MockClientHttpRequest.java:94) at org.springframework.mock.http.client.MockAsyncClientHttpRequest.executeAsync(MockAsyncClientHttpRequest.java:50) at org.springframework.web.client.AsyncRestTemplate.doExecute(AsyncRestTemplate.java:503) at org.springframework.web.client.AsyncRestTemplate.execute(AsyncRestTemplate.java:463) at org.springframework.web.client.AsyncRestTemplate.getForEntity(AsyncRestTemplate.java:217) at com.company.MainClient.getStatus(MainClient.java:151) at com.company.MainController.status(MainController.java:88)

该应用程序聚合来自多个下游系统的数据。要求它提出几个请求。一些请求是异步的，后面会处理Future。其他请求通过立即调用asyncRestTemplateResponse.get()来阻止主线程。

以下测试导致错误：

注意：服务器是MockRestServiceServer

@Test
public void statusTest() throws Exception {
    cServer.expect(once(),requestTo("http://localhost:8080/heartbeat"))
        .andRespond(withSuccess(cStatus, MediaType.APPLICATION_JSON));

    cpServer.expect(once(),requestTo("http://localhost:8081/status"))
            .andRespond(withSuccess(cpStatus, MediaType.APPLICATION_JSON));

    tServer.expect(once(),requestTo("http://localhost:3030/check"))
            .andRespond(withSuccess(tStatus, MediaType.TEXT_PLAIN));

    tServer.expect(once(),requestTo("http://localhost:3031/check"))
            .andRespond(withSuccess(tStatus, MediaType.TEXT_PLAIN));

    tServer.expect(once(),requestTo("http://localhost:3032/check"))
            .andRespond(withSuccess(tStatus, MediaType.TEXT_PLAIN));

    mockMvc.perform(get("/status").with(user(USERNAME).password(PASSWORD).roles("T_CLIENT")))
            .andDo(print()).andExpect(status().isOk())
            .andExpect(jsonPath("$.code").value("200"))
            .andExpect(jsonPath("$.appDescription").value("Main Service"))
            .andExpect(jsonPath("$.gateways[?(@.responseCode =~ /200/)]").isArray());

    //Test without basic auth
    mockMvc.perform(get("/status"))
            .andDo(print()).andExpect(status().isUnauthorized());
}