ArraysIndexOutOfBounds exception in powermockito

Question

我的单元类中有以下行。

 @Reference
 private ConfigService configService;

所以我试图模拟它如下，但是当这一行执行时，它会给出数组索引出界异常

whenNew(ConfigService.class).withAnyArguments().thenReturn(configService);

java.lang.ArrayIndexOutOfBoundsException: 0
    at org.powermock.api.mockito.internal.expectation.DefaultConstructorExpectationSetup.withAnyArguments(DefaultConstructorExpectationSetup.java:64)
    at com.google.core.servlets.forms.HmeServletTest.testDoPost(HmeServletTest.java:82)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
    at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86)
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:94)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84)
    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:101)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
    at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)
    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)

Answer 1

你必须使用这样的东西：

whenNew(ConfigService.class).withAnyArguments().thenReturn(configService);

当您

必须显式调用对象的构造函数时，而不是当您使用 Injection 时。

假设MyClass包含行

@Resource
private ConfigService service;

在你的Junit中试试这个：

@RunWith(PowerMockRunner.class)
public class Test{
    @InjectMocks
    private MyClass myClass;
    @Mock
    private ConfigService service;
    @Before
    public void setUp(){
        myClass = new MyClass();
        MockitoAnnotations.initMocks(this); // this row inits the mock of ConfiService 
                                            // and injects it in myClass
    }
}

最后但并非最不重要的一点是：如果您不打算将PowerMockito用于其他任何内容（静态或私有方法/字段/其他构造函数），则根本不能使用它。

Answer 2

我遇到了这个问题，经过长时间的调查，我发现我在一种方法中两次使用相同的模拟。所以我在两个 When（） 声明之间使用 Mockito.reset（） 休息模拟，它解决了这个问题。

例：

when( mockedQuery.getSingleResult()).thenThrow(NoResultException.class);
//some code
Mockito.reset( mockedOracleQuery );
when(mockedQuery.getSingleResult()).thenReturn(stg);

Answer 3

尝试使用 .withArguments() 调用。 我以前没有见过.withAnyArguments()调用，这可能是对数组的抱怨。 在.withArguments()调用中，您可以使用模拟any类，因此无需指定确切的对象。

例如，你可以让一个构造函数通常采用一个String，然后自定义类X： whenNew(A.class).withArguments(Mockito.anyString(), Mockito.any(X.class)).thenReturn(aMock);