public void GetFirstSupportedCulture(string culture, string?expectedCulture)
    {
        var returnedCulture = CultureUtil.GetFirstSupportedCulture(culture, supportedCultures);

        if (expectedCulture == null)
        {
            returnedCulture.Should().BeNull();
        }
        else
        {
            returnedCulture.Should().Be(new CultureInfo(expectedCulture));
        }
    }
    public void GetFirstSupportedCulture_FallsBackToDefault()
    {
        var returnedCulture = CultureUtil.GetFirstSupportedCulture("Invalid", supportedCultures, new CultureInfo("de-AT"));

        returnedCulture.Should().Be(new CultureInfo("de-AT"));
    }