public void Should_be_able_to_cast()
{
var observer1 = new Mock <IObserver <Data> >();
var observer2 = new Mock <IObserver <ExtendedData> >();
UnitUnderTest.Cast <Data, Data>().Subscribe(observer1.Object);
UnitUnderTest.Cast <Data, ExtendedData>().Subscribe(observer2.Object);
UnitUnderTest.Emit(new ExtendedData {
Value = 1, OtherValue = 2
});
observer1.Verify(f => f.OnNext(It.IsAny <Data>()), Times.Exactly(1));
observer1.Verify(f => f.OnNext(It.Is <Data>(d => d.Value == 1)), Times.Once);
observer2.Verify(f => f.OnNext(It.IsAny <ExtendedData>()), Times.Exactly(1));
observer2.Verify(f => f.OnNext(It.Is <ExtendedData>(d => d.Value == 1 && d.OtherValue == 2)), Times.Once);
}
