Java与mockito失败
我在服务中使用以下方法来模拟AWS sqs
@Override
public Message recieveMessage(String queueUrl) {
Objects.requireNonNull(queueUrl);
ReceiveMessageRequest request = new ReceiveMessageRequest().withQueueUrl(queueUrl).withMaxNumberOfMessages(1);
ReceiveMessageResult receiveMessageResult = this.sqsClient.receiveMessage(request);
// As per the spec, we need to return only one message.
return receiveMessageResult.getMessages().get(0);
}
@Override
public int getMessageCount(String queueUrl) {
GetQueueAttributesResult queueAttributes = sqsClient.getQueueAttributes(queueUrl, Arrays.asList("ApproximateNumberOfMessages"));
return Integer.valueOf(queueAttributes.getAttributes().get("ApproximateNumberOfMessages"));
}
以下是我使用mockito的这些方法的测试用例与NPE的失败。
@Test
public void testRecieveMessage() {
Message message = new Message();
message.setBody("Message Body");
List<Message> messages = new ArrayList<>();
messages.add(message);
ReceiveMessageResult result = new ReceiveMessageResult();
result.setMessages(messages);
when(mock(ReceiveMessageResult.class).getMessages()).thenReturn(messages);
when(mock(List.class).get(0)).thenReturn(message);
when(this.amazonSQSClient.receiveMessage(mock(ReceiveMessageRequest.class))).thenReturn(result);
this.amazonQueueService.recieveMessage(anyString());
verify(this.amazonSQSClient, times(1)).receiveMessage(mock(ReceiveMessageRequest.class));
//Assert.assertNotNull(msg);
}
显示java.lang.NullPointerException在com.example.queue.service.impl.AmazonSQSService.recieveMessage（AmazonSQSService.java:46）在com.example.AmazonSQSServiceTest.testRecieveMessage（AmazonSQSServiceTest.java:77）在sun.reflect.NativeMethodAccessorImpl.invoke0（本地方法）在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498） org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:50）位于org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）的org.junit.runners.model。 FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）位于org.junit.internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）at org.junit.internal.runners.statements.RunBefores.evaluate（RunBefores.java： 26）org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:325）at org.junit.ru nners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:78）在org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:57）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）的组织。 junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）at org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288）at org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）在在org.junit.runners.ParentRunner.run（ParentRunner.java:363）在org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run（JUnit45AndHigherRunnerImpl org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:268）。在org.eclipse.jdt的org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86）上的org.mockito.runners.MockitoJUnitRunner.run（MockitoJUnitRunner.java:62） 。org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:459）at org.internal.junit.runner.TestExecution.run（TestExecution.java:38） .eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:678）at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:382）at org.eclipse.jdt .internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:192）
@Test
public void testMessageCount() {
GetQueueAttributesResult result = new GetQueueAttributesResult();
result.addAttributesEntry("ApproximateNumberOfMessages", "10");
List<String> attrs = Arrays.asList("ApproximateNumberOfMessages");
when(this.amazonSQSClient.getQueueAttributes(anyString(), eq(attrs))).thenReturn(result);
this.amazonQueueService.getMessageCount(anyString());
}
org.mockito.exceptions.misusing.InvalidUseOfMatchersException：使用参数匹配器无效！ 预期2个匹配器，1个记录： - > at com.example.AmazonSQSServiceTest.testMessageCount（AmazonSQSServiceTest.java:96）
如果匹配器与原始值结合，则可能会发生此异常：//不正确：someMethod（anyObject（），“raw String”）; 在使用匹配器时，所有参数必须由匹配器提供。 例如：// correct：someMethod（anyObject（），eq（“String by matcher”））;
欲了解更多信息，请参阅Matchers类的javadoc。
at com.example.queue.service.impl.AmazonSQSService.getMessageCount(AmazonSQSService.java:58)
at com.example.AmazonSQSServiceTest.testMessageCount(AmazonSQSServiceTest.java:96)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
我错过了什么吗？
以下是你的代码的作用：
ReceiveMessageRequest request = new ReceiveMessageRequest().withQueueUrl(queueUrl).withMaxNumberOfMessages(1);
ReceiveMessageResult receiveMessageResult = this.sqsClient.receiveMessage(request);
所以它创建一个新的请求，并将新的请求传递给sqsClient.receiveMessage() 。
以下是你如何测试：
when(this.amazonSQSClient.receiveMessage(mock(ReceiveMessageRequest.class))).thenReturn(result);
所以你的测试告诉模拟客户端在receiveMessage()被模拟ReceiveMessageRequest调用时返回result 。
所以这是行不通的。 模拟ReceiveMessageRequest不等于代码中使用的新请求。 你需要做类似的事情
when(this.amazonSQSClient.receiveMessage(any(ReceiveMessageRequest.class))).thenReturn(result);
因此，无论请求传递给receiveMessage，模拟客户端都会返回结果。
关于你的第二个问题：
this.amazonQueueService.getMessageCount(anyString());
没有意义。 你需要用一个真实的，给定的字符串来调用你的方法。
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