Bug in Mockito with Grails/Groovy

Question

I am using Mockito 1.9 with Grails 1.3.7 and I have a strange bug.

The following test case in java works:

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Answer 1

The problem is Groovy is intercepting your method call before it reaches someVoidMethod. The method actually being called is getMetaClass which is not a void method.

You can verify this is happening by replacing:

doNothing().when(testClassMock).someVoidMethod()

with:

doReturn(testClassMock.getMetaClass()).when(testClassMock).someVoidMethod()

I'm not sure you will be able to get around this issue using stock Mockito and Groovy.