chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Hosting.OpenAI.UnitTests/SortOrderExtensionsTests.cs

@@ -0,0 +1,64 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Hosting.OpenAI.Conversations;
+using Microsoft.Agents.AI.Hosting.OpenAI.Models;
+
+namespace Microsoft.Agents.AI.Hosting.OpenAI.UnitTests;
+
+/// <summary>
+/// Unit tests for SortOrderExtensions.
+/// </summary>
+public sealed class SortOrderExtensionsTests
+{
+    [Fact]
+    public void ToOrderString_Ascending_ReturnsAsc()
+    {
+        // Arrange
+        const SortOrder Order = SortOrder.Ascending;
+
+        // Act
+        string result = Order.ToOrderString();
+
+        // Assert
+        Assert.Equal("asc", result);
+    }
+
+    [Fact]
+    public void ToOrderString_Descending_ReturnsDesc()
+    {
+        // Arrange
+        const SortOrder Order = SortOrder.Descending;
+
+        // Act
+        string result = Order.ToOrderString();
+
+        // Assert
+        Assert.Equal("desc", result);
+    }
+
+    [Fact]
+    public void IsAscending_Ascending_ReturnsTrue()
+    {
+        // Arrange
+        const SortOrder Order = SortOrder.Ascending;
+
+        // Act
+        bool result = Order.IsAscending();
+
+        // Assert
+        Assert.True(result);
+    }
+
+    [Fact]
+    public void IsAscending_Descending_ReturnsFalse()
+    {
+        // Arrange
+        const SortOrder Order = SortOrder.Descending;
+
+        // Act
+        bool result = Order.IsAscending();
+
+        // Assert
+        Assert.False(result);
+    }
+}