Assert.IsNotAssignableFrom - samuelneff/docs GitHub Wiki
Assert.IsNotAssignableFrom succeeds if the object provided may not be assigned a value of the expected type.
Assert.IsNotAssignableFrom( Type expected, object actual );
Assert.IsNotAssignableFrom( Type expected, object actual,
string message, params object[] parms );
Assert.IsNotAssignableFrom<T>( object actual );
Assert.IsNotAssignableFrom<T>( object actual,
string message, params object[] parms );