Below is a test class and a class to be used with it.
When I execute the test, I get the Failure Trace, pasted below. It occurs every
time on my system with this test code.
The test class is modified so that it will call a method in loop, because that
seems to be a good way to reproduce this error every time. In actual
environment the error happens randomly, perhaps once in every two days, because
some background thread just happens to call a static method in the same class I
am mocking at the right time.
Question: Is this a bug in powermock or am I just using it incorrectly? If I'm
using it incorrectly, please be kind and advice me how to use it correctly and
improve the error message to contain that alternative also.
I'm using powermock 1.5.
.................... failure trace ..................................
org.mockito.exceptions.base.MockitoException:
'callProt' is a *void method* and it *cannot* be stubbed with a *return value*!
Voids are usually stubbed with Throwables:
doThrow(exception).when(mock).someVoidMethod();
***
If you're unsure why you're getting above error read on.
Due to the nature of the syntax above problem might occur because:
1. The method you are trying to stub is *overloaded*. Make sure you are calling
the right overloaded version.
2. Somewhere in your test you are stubbing *final methods*. Sorry, Mockito does
not verify/stub final methods.
3. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub
spies -
- with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.
at StaticTest.test(StaticTest.java:31)
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:66)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:312)
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:296)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl$PowerMockJUnit49MethodRunner.executeTestInSuper(PowerMockJUnit49RunnerDelegateImpl.java:116)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl$PowerMockJUnit49MethodRunner.executeTest(PowerMockJUnit49RunnerDelegateImpl.java:77)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:284)
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:209)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:148)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
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:120)
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)
.................... failure trace ..................................
................. StaticTest.java ...........................
import static org.powermock.api.mockito.PowerMockito.mockStatic;
import static org.powermock.api.mockito.PowerMockito.when;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
@RunWith( PowerMockRunner.class )
@PrepareForTest( Static.class )
public class StaticTest
{
@Test
public void test()
{
mockStatic( Static.class );
new Thread()
{
public void run()
{
System.out.println( "start callProt" );
for( int i = 0; i < 10000; i++ )
Static.callProt();
System.out.println( "stop callProt" );
}
}.start();
System.out.println( "start mocking" );
when( Static.isFoo() ).thenReturn( true );
System.out.println( "end mocking" );
}
}
................. StaticTest.java ...........................
................. Static.java ...........................
public class Static
{
protected static void prot()
{
try
{
Thread.sleep( 20 );
}
catch( InterruptedException e )
{
e.printStackTrace();
}
}
public static boolean isFoo()
{
return true;
}
public static void callProt()
{
prot();
}
}
................. Static.java ...........................
Original issue reported on code.google.com by dvice_n...@yahoo.com on 8 Feb 2013 at 1:54
Original issue reported on code.google.com by
dvice_n...@yahoo.comon 8 Feb 2013 at 1:54