public static void LastIndexOfAny(string s, char[] anyOf, int startIndex, int count, int expected)
{
if (count == startIndex + 1)
{
if (startIndex == s.Length - 1)
{
Assert.Equal(expected, s.LastIndexOfAny(anyOf));
}
Assert.Equal(expected, s.LastIndexOfAny(anyOf, startIndex));
}
Assert.Equal(expected, s.LastIndexOfAny(anyOf, startIndex, count));
}