public void GetStandardValues() { NullableConverter converter = new NullableConverter(typeof(MyType?)); Assert.IsTrue(converter.GetStandardValuesSupported(null), "#1"); TypeConverter.StandardValuesCollection values = converter.GetStandardValues(null); // MyTypeConverter returns an empty values collection, but // NullableConverter adds a null value to the set. Assert.AreEqual(1, values.Count, "#2"); Assert.AreEqual(null, values[0], "#3"); }