Re: Mocking a Concrete class with JMock

> I have class with a forwarding method foo:
>
> void foo( Concrete c, String s ) { c.bar( s ); }
>
> I wish to test that foo in fact forwards. Unfortunately for me,  
> Concrete is a class in a third-party library, and is a Concrete  
> type, not an interface. Thus I must use ClassImposterizer in Jmock  
> to mock Concrete, so in my testcase I do this:
>
> @Test
> public final void testFoo() {
>   Mockery context = new JUnit4Mockery() {{
>      setImposteriser(ClassImposteriser.INSTANCE);
>   }};
>
>  final Concrete c = context.mock(Concrete.class);
>  final String s = "xxx" ;
>
>  // expectations
>  context.checking(new Expectations() {{
>
>     oneOf (c).bar(s); // exception gets thrown from here
>  }});
>
>
>  new ClassUnderTest.foo( c, s );
>  context.assertIsSatisfied();
>
> }
>
> Unfortunately, Concrete.bar in turn calls a method that throws. That  
> method is final, so I can't override it. Further, even if I comment  
> out the line new ClassUnderTest.foo( c, s );, the exception is  
> thrown when JMock sets up exceptions, not when foo is called.
>
> So how can I test that method ClassUnderTest.foo does forward to  
> Concrete.bar?
>