gistfile1.txt

public void CultureDayNameTest()
{
    var polishCulture = CultureInfo.CreateSpecificCulture("pl-PL");
    DateTime date = new DateTime(2023, 9, 16);
    // Format the day of the week in the Polish culture. Without specifying
    // the culture, the current culture is used.
    string stringDay = date.ToString("dddd", polishCulture);
    stringDay.ShouldContain(DayOfWeek.Saturday.ToString()); //Not passed
}