1 files changed, 79 insertions, 0 deletions
diff --git a/tests/Jellyfin.Extensions.Tests/StringExtensionsTests.cs b/tests/Jellyfin.Extensions.Tests/StringExtensionsTests.cs
new file mode 100644
index 000000000..69d20bd3f
--- /dev/null
+++ b/tests/Jellyfin.Extensions.Tests/StringExtensionsTests.cs
@@ -0,0 +1,79 @@
+using System;
+using Xunit;
+
+namespace Jellyfin.Extensions.Tests
+{
+    public class StringExtensionsTests
+    {
+        [Theory]
+        [InlineData("", "")] // Identity edge-case (no diactritics)
+        [InlineData("Indiana Jones", "Indiana Jones")] // Identity (no diactritics)
+        [InlineData("a\ud800b", "ab")] // Invalid UTF-16 char stripping
+        [InlineData("åäö", "aao")] // Issue #7484
+        [InlineData("Jön", "Jon")] // Issue #7484
+        [InlineData("Jönssonligan", "Jonssonligan")] // Issue #7484
+        [InlineData("Kieślowski", "Kieslowski")] // Issue #7450
+        [InlineData("Cidadão Kane", "Cidadao Kane")] // Issue #7560
+        [InlineData("운명처럼 널 사랑해", "운명처럼 널 사랑해")] // Issue #6393 (Korean language support)
+        [InlineData("애타는 로맨스", "애타는 로맨스")] // Issue #6393
+        [InlineData("Le cœur a ses raisons", "Le coeur a ses raisons")] // Issue #8893
+        [InlineData("Béla Tarr", "Bela Tarr")] // Issue #8893
+        public void RemoveDiacritics_ValidInput_Corrects(string input, string expectedResult)
+        {
+            string result = input.RemoveDiacritics();
+            Assert.Equal(expectedResult, result);
+        }
+
+        [Theory]
+        [InlineData("", false)] // Identity edge-case (no diactritics)
+        [InlineData("Indiana Jones", false)] // Identity (no diactritics)
+        [InlineData("a\ud800b", true)] // Invalid UTF-16 char stripping
+        [InlineData("åäö", true)] // Issue #7484
+        [InlineData("Jön", true)] // Issue #7484
+        [InlineData("Jönssonligan", true)] // Issue #7484
+        [InlineData("Kieślowski", true)] // Issue #7450
+        [InlineData("Cidadão Kane", true)] // Issue #7560
+        [InlineData("운명처럼 널 사랑해", false)] // Issue #6393 (Korean language support)
+        [InlineData("애타는 로맨스", false)] // Issue #6393
+        [InlineData("Le cœur a ses raisons", true)] // Issue #8893
+        [InlineData("Béla Tarr", true)] // Issue #8893
+        public void HasDiacritics_ValidInput_Corrects(string input, bool expectedResult)
+        {
+            bool result = input.HasDiacritics();
+            Assert.Equal(expectedResult, result);
+        }
+
+        [Theory]
+        [InlineData("", '_', 0)]
+        [InlineData("___", '_', 3)]
+        [InlineData("test\x00", '\x00', 1)]
+        [InlineData("Imdb=tt0119567|Tmdb=330|TmdbCollection=328", '|', 2)]
+        public void ReadOnlySpan_Count_Success(string str, char needle, int count)
+        {
+            Assert.Equal(count, str.AsSpan().Count(needle));
+        }
+
+        [Theory]
+        [InlineData("", 'q', "")]
+        [InlineData("Banana split", ' ', "Banana")]
+        [InlineData("Banana split", 'q', "Banana split")]
+        [InlineData("Banana split 2", ' ', "Banana")]
+        public void LeftPart_ValidArgsCharNeedle_Correct(string str, char needle, string expectedResult)
+        {
+            var result = str.AsSpan().LeftPart(needle).ToString();
+            Assert.Equal(expectedResult, result);
+        }
+
+        [Theory]
+        [InlineData("", 'q', "")]
+        [InlineData("Banana split", ' ', "split")]
+        [InlineData("Banana split", 'q', "Banana split")]
+        [InlineData("Banana split.", '.', "")]
+        [InlineData("Banana split 2", ' ', "2")]
+        public void RightPart_ValidArgsCharNeedle_Correct(string str, char needle, string expectedResult)
+        {
+            var result = str.AsSpan().RightPart(needle).ToString();
+            Assert.Equal(expectedResult, result);
+        }
+    }
+}