public void FillCountryList_UseAllCultures_ReturnsCountries() { ICountriesProvider provider = new CountriesProvider(); CultureInfo[] cInfoList = CultureInfo.GetCultures(CultureTypes.SpecificCultures); var count = cInfoList.Select(x => new RegionInfo(x.LCID).EnglishName).Distinct().Count(); List <string> result = provider.FillCountryList(); Assert.IsNotNull(result); Assert.AreEqual(result.Count, count); }