How to mock a void private method to throw Abstract Exception with Powermock?

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bhagat singh

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Dec 20, 2017, 9:41:51 AM12/20/17

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While writing unit test case for method someMethod1, I have a use case where I'm trying to ensure that an abstract exception (AnalysisException) is thrown when method (someMethod2) is called. Class under test is JdbcTemplateSampleImpl .

public class JdbcTemplateSampleImpl {

public void someMethod1() {

someMethod2();

}

private void someMethod2() throws AnalysisException {

// some code here

}

I am using PowerMockito to do like this

@Test(expected = com.test.AnalysisException.class)

public void abstractClassExceptionCheck2Test1() throws Throwable {

JdbcTemplateSampleImpl jdbcTemplateSampleImpl1 =

PowerMockito.spy(jdbcTemplateSampleImpl0);

PowerMockito.doThrow(mock(AnalysisException.class)).

when(jdbcTemplateSampleImpl1,"classCheck2");

jdbcTemplateSampleImpl1.abstractClassExceptionCheck2();

}

But while executing test case , i'm getting an error like this

java.lang.Exception: Unexpected exception, expected<com.test.AnalysisException> but was<java.lang.NullPointerException>

at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:28)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)

at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:73)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)

at org.junit.runners.ParentRunner.run(ParentRunner.java:309)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Caused by: java.lang.NullPointerException

at java.util.Arrays$ArrayList.<init>(Arrays.java:2842)

at java.util.Arrays.asList(Arrays.java:2828)

at org.mockito.internal.exceptions.stacktrace.StackTraceFilter.filter(StackTraceFilter.java:31)

at org.mockito.internal.exceptions.stacktrace.ConditionalStackTraceFilter.filter(ConditionalStackTraceFilter.java:23)

at org.mockito.internal.invocation.realmethod.CleanTraceRealMethod.invoke(CleanTraceRealMethod.java:32)

at org.mockito.internal.invocation.InvocationImpl.callRealMethod(InvocationImpl.java:112)

at org.mockito.internal.stubbing.answers.CallsRealMethods.answer(CallsRealMethods.java:41)

at org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:93)

at org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)

at org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:38)

at org.powermock.api.mockito.repackaged.MethodInterceptorFilter.intercept(MethodInterceptorFilter.java:60)

at org.powermock.api.mockito.internal.mockcreation.PowerMockMethodInterceptorFilter.intercept(PowerMockMethodInterceptorFilter.java:20)

at com.test.JdbcTemplateSampleImpl$$EnhancerByMockitoWithCGLIB$$f5014a3d.abstractClassExceptionCheck2(<generated>)

at com.test.JdbcTemplateSampleImpl2Test.abstractClassExceptionCheck2Test1(JdbcTemplateSampleImpl2Test.java:56)

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.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:19)