gistfile1.cs

public interface IEmediateAd {
    int ContentUnit { get; }
    string Url { get; }
    int Height { get; }
    int Width { get; }
}

public class Loader {
        
    public string Load(IEmediateAd ad) {
        return "EAS_load_fif(eas_13, EAS_fif.html, url, 0 ,0)";
    }
}

[TestMethod]
public void TestPrintsEasLoadStringBasedOnAd() {
    var ad = MockRepository.GenerateMock<IEmediateAd>();
    ad.Stub(x => x.ContentUnit).Return(5);
    ad.Stub(x => x.Url).Return("http:");
    ad.Stub(x => x.Height).Return(0);
    ad.Stub(x => x.Width).Return(0);
    var loader = new Loader();
    Assert.AreEqual("EAS_load_fif(EAS_5, EAS_fif.html, http, 0 ,0)", loader.Load(ad));
}