我在单元测试中有这两行:
DefaultMessageListenerContainer defaultMessageListenerContainer = Mockito.mock(DefaultMessageListenerContainer.class);
when(defaultMessageListenerContainer.isRunning()).thenReturn(true);
堆栈追踪:
java.lang.NullPointerException
at org.springframework.jms.listener.AbstractJmsListeningContainer.isRunning(AbstractJmsListeningContainer.java:347)
at xxxxxxxxxxxxxx.MessageProcessorControllerTest.testPing(MessageProcessorControllerTest.java:109)
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:497)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:774)
at org.testng.TestRunner.run(TestRunner.java:624)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:359)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312)
at org.testng.SuiteRunner.run(SuiteRunner.java:261)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1191)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1116)
at org.testng.TestNG.run(TestNG.java:1024)
at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:72)
at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:124)
无论我做什么,NPE都会在when
行上抛出,就好像在设置存根时调用真正的方法一样。我正在使用mockito v1.10.19。我做错了什么?
更新 以下是整个独立测试类:
import org.mockito.Mockito;
import org.springframework.jms.listener.DefaultMessageListenerContainer;
import org.testng.annotations.Test;
import static org.mockito.Mockito.when;
public class JmsTest {
@Test
public void test() throws Exception {
DefaultMessageListenerContainer defaultMessageListenerContainer = Mockito.mock(
DefaultMessageListenerContainer.class);
when(defaultMessageListenerContainer.isRunning()).thenReturn(true);
}
}
引发的异常:
java.lang.NullPointerException
at org.springframework.jms.listener.AbstractJmsListeningContainer.isRunning(AbstractJmsListeningContainer.java:347)
at xxxxxxxxxxx.util.JmsTest.test(JmsTest.java:17)
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:497)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:774)
at org.testng.TestRunner.run(TestRunner.java:624)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:359)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312)
at org.testng.SuiteRunner.run(SuiteRunner.java:261)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1191)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1116)
at org.testng.TestNG.run(TestNG.java:1024)
at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:72)
at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:124)
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:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
答案 0 :(得分:0)
您的defaultMessageListenerContainer
不是正在使用的人。失败的是AbstractJmsListeningContainer
类型。
您需要确保将mocked变量正确传递给您要测试的类。
答案 1 :(得分:0)
这是一个很好的!我已经预料到测试会通过,因为它似乎只是设定了预期,然后没有断言。我想我会把它留给Mockito专家,为什么这个看起来很简单的练习不起作用。我当然有兴趣知道背后的原因。同时,如果你可以选择使用另一个库,我会提供这个建议:试试JMockit。以下应该大致相当于你试图用Mockito实现的......但是测试通过了。祝你好运!
import mockit.Expectations;
import mockit.Mocked;
import org.junit.Test;
import org.springframework.jms.listener.DefaultMessageListenerContainer;
import static org.assertj.core.api.Assertions.assertThat;
public class JmsTest2 {
@Mocked
DefaultMessageListenerContainer defaultMessageListenerContainer;
@Test
public void test() throws Exception {
new Expectations() {{
defaultMessageListenerContainer.isRunning(); result = true;
}};
assertThat(defaultMessageListenerContainer.isRunning()).isTrue();
}
}
编辑1:
仔细研究一下,看起来围绕标记为final的对象的isRunning()方法存在一些同步。 Mockito,AFAIK,如果你有一些标记为final的对象你想要改变,那么它往往没那么有用。你可以试着用PowerMock来对抗它,或者使用不同的库 - 我已经建议了我喜欢的那个 - 我认为这对你来说是一个干净而简单的方法。
protected final Object lifecycleMonitor = new Object();
...
@Override
public final boolean isRunning() {
synchronized (this.lifecycleMonitor) {
return (this.running && runningAllowed());
}
}