public void FromAcceptLanguageHeader(string header, string expectedCulture) { var acceptLanguage = new RequestHeaders(new HeaderDictionary { ["accept-language"] = header }).AcceptLanguage; var returnedCulture = CultureUtil.FromAcceptLanguageHeader(acceptLanguage, supportedCultures, new CultureInfo("de-AT")); returnedCulture.Should().Be(new CultureInfo(expectedCulture)); }