java - 如何模拟 DefaultMessageListenerContainer

Question

我正在努力模拟(使用 Mockito)DefaultMessageListenerContainer (org.springframework.jms.listener.DefaultMessageListenerContainer)。这是我的代码:

@Mock
private DefaultMessageListenerContainer defaultMessageListenerContainer;

@Before
public void init() {

    MockitoAnnotations.initMocks( this );
    incomingFeedController = new IncomingFeedControllerImpl();

}

@Test 
public void testHandleConnectionState() { 
    List< DefaultMessageListenerContainer > listeners = 
        new ArrayList< DefaultMessageListenerContainer >(); 
    listeners.add( defaultMessageListenerContainer ); 
    incomingFeedController.setContainers( listeners ); 
    when( defaultMessageListenerContainer.isRunning() ).thenReturn( false );
}

然后我想做一些适当的测试，例如:

when( defaultMessageListenerContainer.isRunning() ).thenReturn( false );

但是在 junit 运行之后，这一行以:

java.lang.NullPointerException    at org.springframework.jms.listener.AbstractJmsListeningContainer.isRunning(AbstractJmsListeningContainer.java:312)    at com.source.etf.manager.integrationgateway.feedcontroller.IncomingFeedControllerTest.testHandleConnectionState(IncomingFeedControllerTest.java:37)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)    at java.lang.reflect.Method.invoke(Unknown Source)    at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)    at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)    at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)    at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)    at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)    at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)    at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

I also checked the AbstractJmsListeningContainer and here is the code where NPE occures:

public final boolean isRunning() {
    synchronized (this.lifecycleMonitor) {
        return (this.running && runningAllowed());
    }
}

我发现 lifecycleMonitor 对象没有被实例化。该对象在顶部的 AbstractJmsListeningContainer 中声明:

protected final Object lifecycleMonitor = new Object();

知道如何正确模拟 DefaultMessageListenerContainer 吗？

Answer 1

您仍然需要在您正在初始化的对象上设置 mock。

我看到您正在测试 IncomingFeedControllerImpl，您的模拟对象很可能是此类实例的成员。因为您没有在 IncomingFeedControllerImpl 上显式设置模拟的 DefaultMessageListenerContainer，所以 AbstractJmsListeningContainer(可能是 @Autowired)是仍然闲逛，没有被 mock 。

您需要使用 setter 方法或构造函数来注入(inject)它。 (你也可以@Autowired它)