1 files changed, 27 insertions, 0 deletions
diff --git a/tests/Jellyfin.Providers.Tests/Tmdb/TmdbUtilsTests.cs b/tests/Jellyfin.Providers.Tests/Tmdb/TmdbUtilsTests.cs
new file mode 100644
index 000000000..f6a7c676f
--- /dev/null
+++ b/tests/Jellyfin.Providers.Tests/Tmdb/TmdbUtilsTests.cs
@@ -0,0 +1,27 @@
+using MediaBrowser.Providers.Plugins.Tmdb;
+using Xunit;
+
+namespace Jellyfin.Providers.Tests.Tmdb
+{
+    public static class TmdbUtilsTests
+    {
+        [Theory]
+        [InlineData("de", "de")]
+        [InlineData("En", "En")]
+        [InlineData("de-de", "de-DE")]
+        [InlineData("en-US", "en-US")]
+        [InlineData("de-CH", "de")]
+        public static void NormalizeLanguage_Valid_Success(string input, string expected)
+        {
+            Assert.Equal(expected, TmdbUtils.NormalizeLanguage(input));
+        }
+
+        [Theory]
+        [InlineData(null, null)]
+        [InlineData("", "")]
+        public static void NormalizeLanguage_Invalid_Equal(string? input, string? expected)
+        {
+            Assert.Equal(expected, TmdbUtils.NormalizeLanguage(input!));
+        }
+    }
+}