Self Returning Answer for Mockito

SelfReturningAnswer.java

public class SelfReturningAnswer implements Answer<Object> {

    public Object answer(InvocationOnMock invocation) throws Throwable {
        Object mock = invocation.getMock();
        if( invocation.getMethod().getReturnType().isInstance( mock )){
            return mock;
        }
        else{
            return RETURNS_DEFAULTS.get().answer(invocation);
        }
    }
}