How to verify a method was invoked with a delegate?

[Dave]

How does one go about testing that a delegate was passed to a method?  I have a class with a method:

class Worker {

    public void MainLoop() {
    }

}

And another class

class Foo {

    public void Bar( Action methodToRunInLoop) {

      ...

    }

}

and some code that does this

Worker w = new Worker();

Foo f = new Foo();

f.Bar(w.MainLoop);

What I want to do is to verify that "f.Bar(w.MainLoop);" was called.

Thanks.

[Patrick Steele]

What you should be doing is simply making sure that f.Bar calls the
delegate that is passed to it -- which is really what is happening.
Something like this won't need Rhino.Mocks. You could do:

var methodCalled = false;
var foo = new Foo();
f.Bar(() => methodCalled = true);
Assert.IsTrue(methodCalled);

If bar never calls the delegate passed to it, methodCalled will still
be false and your test will fail.

---
Patrick Steele
http://weblogs.asp.net/psteele

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