Saturday, September 05, 2009

The other way of faking it

by Patrik Hägne via Legend and truth on 9/5/2009 1:32:00 PM

I’ve added a new way to create fake objects in FakeItEasy. You might call the “traditional” way of doing it in FakeItEasy is the “Rhino-style”:

public static void TraditionalWay()
{
    var foo = A.Fake<IFoo>();
    foo.Configure().CallsTo(x => x.Baz()).Returns(10);

    int value = foo.Baz();

    Fake.Assert(foo).WasCalled(x => x.Baz());
}

When creating fakes in this way the returned faked object is of the type specified in the A.Fake-call, faking an IFoo returns an IFoo. When creating a fake the new way, which we might call the “Moq-style” you instead create a fake object that provides an api for configuring the faked object as well as a reference to the faked object:

public static void TheOtherWay()
{
    var foo = new Fake<IFoo>();
    foo.CallsTo(x => x.Baz()).Returns(10);

    int value = foo.FakedObject.Baz();

    foo.Assert().WasCalled(x => x.Baz());
}

Both styles are equally supported so that the developer can choose what ever style he/she is most comfortable with.