问题描述
我正在尝试为切换 SimpleMessageListenerContainer(启动/停止)的 Spring EventListener 创建单元测试。
我要测试的代码:
@Configuration
public class SpringEventsListeners {
private static CPLocation cpLocation = CPLoggingFactory.createCPLocation(SpringEventsListeners.class);
private ConfigurationServiceImpl configService;
//Constructor Injection for Testability.
public SpringEventsListeners(final ConfigurationServiceImpl configService) {
this.configService = configService;
}
/**
* Rabbit listeners might be started/stopped after a refresh depending on a property.
* In case a change is needed,we perform it.
*/
@EventListener(classes= { ApplicationReadyEvent.class,EnvironmentChangeEvent.class })
public void handleRabbitListenerToggle() {
String method = "handleRabbitListenerToggle";
cpLocation.info(method,"Received refresh event. Determining action.");
boolean shouldActivaterabbit = configService.shouldActivaterabbitListeners();
for (SimpleMessageListenerContainer container : configService.getAllRabbitSimpleMessageListenerContainers()) {
if (shouldActivaterabbit && !container.isActive()) {
container.start();
cpLocation.info(method,"Starting container: "+Arrays.toString(container.getQueueNames()));
}
else if (!shouldActivaterabbit && container.isActive()) {
container.shutdown();
cpLocation.info(method,"Shutting down container: "+Arrays.toString(container.getQueueNames()));
}
}
}
}
最小测试(什么都不测试):
@RunWith(MockitoJUnitRunner.class)
public class SpringEventsListenersTests {
@InjectMocks
private SpringEventsListeners classUnderTest;
@Mock
private ConfigurationServiceImpl mockConfigurationService;
@Mock
private SimpleMessageListenerContainer mockSimpleMessageListenerContainer;
@Test
public void testToggleTrue() {
//Given
given(mockConfigurationService.shouldActivaterabbitListeners()).willReturn(true);
given(mockConfigurationService.getAllRabbitSimpleMessageListenerContainers()).willReturn(Arrays.asList(mockSimpleMessageListenerContainer));
given(mockSimpleMessageListenerContainer.isActive()).willReturn(false);
//When
classUnderTest.handleRabbitListenerToggle();
Assert.assertthat(true,is(true));
}
}
当我在 given(mockSimpleMessageListenerContainer.isActive()).willReturn(false);
上收到 NullPointerException 时,测试不会运行:
java.lang.NullPointerException 在 org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.isActive(AbstractMessageListenerContainer.java:1271) 在 com.cp.order.listener.SpringEventsListenersTests.testToggleTrue(SpringEventsListenersTests.java:36) 在 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 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) 在 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 在 org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 在 org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 在 org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 在 org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) 在 org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:78) 在 org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:57) 在 org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 在 org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 在 org.junit.runners.ParentRunner.runchildren(ParentRunner.java:288) 在 org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 在 org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 在 org.junit.runners.ParentRunner.run(ParentRunner.java:363) 在 org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79) 在 org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85) 在 org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39) 在 org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163) 在 org.junit.runner.JUnitCore.run(JUnitCore.java:137) 在 com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) 在 com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) 在 com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) 在 com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
我还需要断言 .shutdown 或 .start 是在容器上调用的,因此需要对其进行模拟。
解决方法
Mockito 不能模拟 final
方法(isActive()
是最终的)。
您可以使用反射(例如 DirectFieldAccessor
)来检查 active
字段。
也就是说,嘲笑侦听器容器是相当不寻常的;它是一段复杂的代码;也许您可以准确解释您要测试的内容?