public void Polymorphic_FactoryMethods()
{
var grainFullName = typeof(PolymorphicTestGrain).FullName;
IC ICRef = GrainClient.GrainFactory.GetGrain <IF>(GetRandomGrainId(), grainFullName); // FRef factory method returns a polymorphic reference to ICRef
Assert.AreEqual("B2", ICRef.B2Method().Result);
IA IARef = GrainClient.GrainFactory.GetGrain <ID>(GetRandomGrainId(), grainFullName); // DRef factory method returns a polymorphic reference to IARef
Assert.AreEqual("A1", IARef.A1Method().Result);
}