1 files changed, 35 insertions, 0 deletions
diff --git a/tests/Jellyfin.Server.Implementations.Tests/Item/OrderMapperTests.cs b/tests/Jellyfin.Server.Implementations.Tests/Item/OrderMapperTests.cs
new file mode 100644
index 000000000..caf2b06b7
--- /dev/null
+++ b/tests/Jellyfin.Server.Implementations.Tests/Item/OrderMapperTests.cs
@@ -0,0 +1,35 @@
+using System;
+using Jellyfin.Data.Enums;
+using Jellyfin.Database.Implementations.Entities;
+using Jellyfin.Server.Implementations.Item;
+using MediaBrowser.Controller.Entities;
+using Xunit;
+
+namespace Jellyfin.Server.Implementations.Tests.Item;
+
+public class OrderMapperTests
+{
+    [Fact]
+    public void ShouldReturnMappedOrderForSortingByPremierDate()
+    {
+        var orderFunc = OrderMapper.MapOrderByField(ItemSortBy.PremiereDate, new InternalItemsQuery()).Compile();
+
+        var expectedDate = new DateTime(1, 2, 3);
+        var expectedProductionYearDate = new DateTime(4, 1, 1);
+
+        var entityWithOnlyProductionYear = new BaseItemEntity { Id = Guid.NewGuid(), Type = "Test", ProductionYear = expectedProductionYearDate.Year };
+        var entityWithOnlyPremierDate = new BaseItemEntity { Id = Guid.NewGuid(), Type = "Test", PremiereDate = expectedDate };
+        var entityWithBothPremierDateAndProductionYear = new BaseItemEntity { Id = Guid.NewGuid(), Type = "Test", PremiereDate = expectedDate, ProductionYear = expectedProductionYearDate.Year };
+        var entityWithoutEitherPremierDateOrProductionYear = new BaseItemEntity { Id = Guid.NewGuid(), Type = "Test" };
+
+        var resultWithOnlyProductionYear = orderFunc(entityWithOnlyProductionYear);
+        var resultWithOnlyPremierDate = orderFunc(entityWithOnlyPremierDate);
+        var resultWithBothPremierDateAndProductionYear = orderFunc(entityWithBothPremierDateAndProductionYear);
+        var resultWithoutEitherPremierDateOrProductionYear = orderFunc(entityWithoutEitherPremierDateOrProductionYear);
+
+        Assert.Equal(resultWithOnlyProductionYear, expectedProductionYearDate);
+        Assert.Equal(resultWithOnlyPremierDate, expectedDate);
+        Assert.Equal(resultWithBothPremierDateAndProductionYear, expectedDate);
+        Assert.Null(resultWithoutEitherPremierDateOrProductionYear);
+    }
+}