public static void TryFind_Char_Ordinal(ustring source, char searchTerm, Range?expectedForwardMatch, Range?expectedBackwardMatch)
{
using BoundedUtf8Span boundedSpan = new BoundedUtf8Span(source.AsBytes());
Utf8Span searchSpan = boundedSpan.Span;
source = null; // to avoid accidentally using this for the remainder of the test
// First, search forward
bool wasFound = searchSpan.TryFind(searchTerm, out Range actualForwardMatch);
Assert.Equal(expectedForwardMatch.HasValue, wasFound);
if (wasFound)
{
AssertRangesEqual(searchSpan.Length, expectedForwardMatch.Value, actualForwardMatch);
}
// Also check Contains / StartsWith / SplitOn
Assert.Equal(wasFound, searchSpan.Contains(searchTerm));
Assert.Equal(wasFound && searchSpan.Bytes[..actualForwardMatch.Start].IsEmpty, searchSpan.StartsWith(searchTerm));
(var before, var after) = searchSpan.SplitOn(searchTerm);
if (wasFound)
{
Assert.True(searchSpan.Bytes[..actualForwardMatch.Start] == before.Bytes); // check for referential equality
