public void IndexOfAny()
{
var str = new StringSlice("hello cruel world!");
Assert.That(str.IndexOfAny(new[] { 'r', 'w', 'd' }), Is.EqualTo(7));
str = str.Substring(5);
Assert.That(str.IndexOfAny(new[] { 'o', 'w', 'd' }), Is.EqualTo(7));
}