由于 RabbitMq 生产者导致的 Junit / Mockito 错误

Question

我有一个实现 class 正在尝试保存 POST 请求，该请求将由 RabbitMQ 的生产者 class 获取。但是当我编写 Junit 测试用例时，它失败了。你能告诉我错误是什么以及如何正确编写吗？

如果需要更多信息，请告诉我。

MatchServiceImpl.java

@Override
    public boolean saveMatch(Match match) throws MatchAlreadyExistsException {
        MatchDTO matchDto = new MatchDTO();
        matchDto.setUnique_id(match.getUnique_id());
        matchDto.setTeamOne(match.getTeamOne());
        matchDto.setTeamTwo(match.getTeamTwo());
        matchDto.setMatchDate(match.getMatchDate());
        matchDto.setMatchStarted(match.isMatchStarted());
        matchDto.setUserId(match.getUserId());

        final Optional<Match> matchObj = matchRepository.findById(match.getId());
        if (matchObj.isPresent()) {
            throw new MatchAlreadyExistsException("Could not save match. Match is already exists");
        }
        matchRepository.save(match);
       //producer.sendMessageToRabbitMq(matchDto);
        return true;
    }

Junit 测试用例：MatchServiceImplTest.java

@Test
    public void testSavematchSuccess() throws MatchAlreadyExistsException {
        when(matchRepo.save(match)).thenReturn(match);
        final boolean flag = matchServiceImpl.saveMatch(match);
        assertTrue("saving match failed", flag);
        verify(matchRepo, times(1)).save(match);
    }

如果我在测试用例通过之前注释代码，否则我会得到以下错误

java.lang.NullPointerException
    at com.stackroute.favouriteservice.service.MatchServiceImpl.saveMatch(MatchServiceImpl.java:44)
    at com.stackroute.favouriteservice.service.MatchServiceImplTest.testSavematchSuccess(MatchServiceImplTest.java:53)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.junit.runners.model.FrameworkMethod.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.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access[=12=]0(ParentRunner.java:58)
    at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Answer 1

您需要添加 matchRepo.findById(...) 期望值，否则 mock 将 return 为空并且您的测试在 if (matchObj.isPresent()).

上失败

试试下面的代码：

when(matchRepo.findById(match.getId())).thenReturn(Optional.empty());
when(matchRepo.save(match)).thenReturn(match);

由于 RabbitMq 生产者导致的 Junit / Mockito 错误

Junit / Mockito error due to RabbitMq producer

junit4

rabbitmq

spring-boot