[mocha-developer] Expect with "real world" returns?

[Carl Mercier]

Is there a way to do something like this?

class Foo
   def self.hello(name)
     "Hello #{name}!"
   end
end

Foo.expects(:bar).with("Carl").once

assert_equal "Hello Carl!", Foo.hello

Basically, my problem is that once you set an expectation, the  
original code is never executed and is not tested.  However, it's  
still very useful to set expectations to make sure the right arguments  
are passed to certain methods.  The above example surely is over  
simplistic, but in a real world scenario, it totally makes sense.

Is it possible to do something like this in Mocha as it is right now.   
If not, is that something you'd consider implementing?

Thanks!

/carl