Assert.IsAssignableFrom - samuelneff/docs GitHub Wiki
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[] parms );
Assert.IsAssignableFrom<T>( object actual );
Assert.IsAssignableFrom<T>( object actual,
string message, params object[] parms );