public void SettingsAcceptEmptyStringForRegex() { ITH.SetGlobalSetting(g => g.LinksRegex, "some_value"); app.NavigateTo <SettingsController>(c => c.Index()); app.FindFormFor <GlobalSettingsModel>() .Field(f => f.LinksRegex).SetValueTo("") .Submit(); var field = app.FindFormFor <GlobalSettingsModel>() .Field(f => f.LinksRegex); field.ValueShouldEqual(""); Assert.AreEqual(false, field.Field.GetAttribute("class").Contains("valid")); }