java - mockito 拒绝将 TypeSafeMatcher 与通用方法 API 配对

Question

我想测试调用某些 API 的代码:

public <T extends MessageLite> ApiFuture<String> publish(final T message) throws Exception {
}


public <T extends MessageLite> ApiFuture<String> publish(final T message, final ApiFutureCallback<T> futureCallback) throws Exception {
}


public <T> String publishSynchronous(final String message, final ApiFutureCallback<T> futureCallback) throws Exception {
}

在我的测试中，我使用 mockito mock，然后我想验证它是使用具有字段 isSuccess = false

的原型(prototype)对象(扩展 MessageLite)调用的

我厌倦了这段代码:

    verify(customPublisher, times(0)).publish(isFailureResult(), anyObject());

和这个匹配器:

public class FailResultMatcher extends TypeSafeMatcher<MessageLite> {

    @Override
    protected boolean matchesSafely(final MessageLite sentResult) {
        return !((SdkResult)sentResult).getIsSuccess();
    }


    public static FailResultMatcher isFailureResult() {
        return new FailResultMatcher();
    }

    @Override
    public void describeTo(final Description description) {

    }
}

但我在测试编译时遇到错误:

Error:(131, 42) java: no suitable method found for publish(com.w.sdkService.matchers.FailResultMatcher,java.lang.Object)
    method linqmap.cloud.google.pubsub.CustomPublisher.<T>publish(java.lang.String,com.google.api.core.ApiFutureCallback<T>) is not applicable
      (cannot infer type-variable(s) T
        (argument mismatch; com.w.sdkService.matchers.FailResultMatcher cannot be converted to java.lang.String))
    method linqmap.cloud.google.pubsub.CustomPublisher.<T>publish(T) is not applicable
      (cannot infer type-variable(s) T
        (actual and formal argument lists differ in length))
    method linqmap.cloud.google.pubsub.CustomPublisher.<T>publish(T,com.google.api.core.ApiFutureCallback<T>) is not applicable
      (inferred type does not conform to upper bound(s)
        inferred: com.w.sdkService.matchers.FailResultMatcher
        upper bound(s): com.google.protobuf.MessageLite)

我该如何解决这个问题？

Answer 1

根据文档(Mockito 1 和 Mockito 2)，您必须使用 argThat(matcher)，这是一个允许您使用自定义参数匹配器的 Mockito 匹配器:

 //stubbing
 when(mock.giveMe(argThat(new MyHamcrestMatcher())));

 //verification
 verify(mock).giveMe(argThat(new MyHamcrestMatcher()));

你没有说你使用的是 Mockito 1 还是 2，但想法是相似的，只是静态导入不同:

• 1: import static org.mockito.Matchers.argThat;(或者为简单起见 org.mockito.Mockito 扩展了 Matchers)
• 2: import static org.mockito.hamcrest.MockitoHamcrest.argThat;

额外提示，为了便于阅读，您可以将 times(0) 替换为 never() ，所以在你的情况下它将是:

verify(customPublisher, never()).publish(argThat(isFailureResult()), anyObject());