Sync reverse-string tests

exercises/practice/reverse-string/.meta/Example.cs

@@ -1,10 +1,21 @@
-using System;
+using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 
 public static class ReverseString
 {
     public static string Reverse(string input)
     {
-        return new string(input.ToCharArray().Reverse().ToArray());
+        if (string.IsNullOrEmpty(input))
+        {
+            return input;
+        }
+
+        StringInfo stringInfo = new(input);
+        IEnumerable<string> reversed = Enumerable.Range(0, stringInfo.LengthInTextElements)
+            .Select(i => stringInfo.SubstringByTextElements(i, 1))
+            .Reverse();
+
+        return string.Join("", reversed);
     }
 }

exercises/practice/reverse-string/.meta/tests.toml

@@ -26,3 +26,12 @@ description = "a palindrome"
 
 [b9e7dec1-c6df-40bd-9fa3-cd7ded010c4c]
 description = "an even-sized word"
+
+[1bed0f8a-13b0-4bd3-9d59-3d0593326fa2]
+description = "wide characters"
+
+[93d7e1b8-f60f-4f3c-9559-4056e10d2ead]
+description = "grapheme cluster with pre-combined form"
+
+[1028b2c1-6763-4459-8540-2da47ca512d9]
+description = "grapheme clusters"

exercises/practice/reverse-string/ReverseStringTests.cs

@@ -37,4 +37,22 @@ public void An_even_sized_word()
     {
         Assert.Equal("reward", ReverseString.Reverse("drawer"));
     }
+
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Wide_characters()
+    {
+        Assert.Equal("猫子", ReverseString.Reverse("子猫"));
+    }
+
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Grapheme_cluster_with_precombined_form()
+    {
+        Assert.Equal("dnatsnehctsrüW", ReverseString.Reverse("Würstchenstand"));
+    }
+
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Grapheme_clusters()
+    {
+        Assert.Equal("มรกแรปโนยขีเผู้", ReverseString.Reverse("ผู้เขียนโปรแกรม"));
+    }
 }