Assert.IsAssignableFrom
Assert.IsAssignableFrom succeeds if the object provided may be assigned a value of the expected type.
Assert.IsAssignableFrom(Type expected, object actual);
Assert.IsAssignableFrom(Type expected, object actual,
string message, params object[] params);
Assert.IsAssignableFrom<T>(object actual);
Assert.IsAssignableFrom<T>(object actual,
string message, params object[] params);