Create the TestCaseTextIndexHelper for able to deal with time-index f…

…ormat.

osu.Framework.Font.Tests/Helper/TestCaseTextIndexHelper.cs

@@ -0,0 +1,23 @@
+// Copyright (c) karaoke.dev <[email protected]>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Text.RegularExpressions;
+using osu.Framework.Graphics.Sprites;
+
+namespace osu.Framework.Font.Tests.Helper;
+
+public class TestCaseTextIndexHelper
+{
+    public static TextIndex ParseTextIndex(string str)
+    {
+        var regex = new Regex("(?<index>[-0-9]+),(?<state>start|end)");
+        var result = regex.Match(str);
+        if (!result.Success)
+            throw new RegexMatchTimeoutException(nameof(str));
+
+        int index = int.Parse(result.Groups["index"].Value);
+        var state = result.Groups["state"].Value == "start" ? TextIndex.IndexState.Start : TextIndex.IndexState.End;
+
+        return new TextIndex(index, state);
+    }
+}