chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.CosmosNoSql.UnitTests/CosmosOptionsHelperTests.cs

@@ -0,0 +1,75 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.CosmosNoSql;
+using Microsoft.Azure.Cosmos;
+
+namespace Microsoft.Agents.AI.CosmosNoSql.UnitTests;
+
+public sealed class CosmosOptionsHelperTests
+{
+    [Fact]
+    public void CreateOptions_SetsApplicationName_WithComponentAndVersion()
+    {
+        // Act
+        var options = CosmosOptionsHelper.CreateOptions("CosmosChatHistoryProvider");
+
+        // Assert
+        Assert.NotNull(options.ApplicationName);
+        Assert.StartsWith("Microsoft.Agents.AI.CosmosNoSql.CosmosChatHistoryProvider/", options.ApplicationName);
+    }
+
+    [Fact]
+    public void CreateOptions_DifferentComponents_ProduceDifferentNames()
+    {
+        // Act
+        var chatOptions = CosmosOptionsHelper.CreateOptions("CosmosChatHistoryProvider");
+        var checkpointOptions = CosmosOptionsHelper.CreateOptions("CosmosCheckpointStore");
+
+        // Assert
+        Assert.NotEqual(chatOptions.ApplicationName, checkpointOptions.ApplicationName);
+        Assert.Contains("CosmosChatHistoryProvider", chatOptions.ApplicationName);
+        Assert.Contains("CosmosCheckpointStore", checkpointOptions.ApplicationName);
+    }
+
+    [Fact]
+    public void CreateOptions_ApplicationName_DoesNotExceedMaxLength()
+    {
+        // Use a deliberately long component name to trigger truncation
+        var longComponent = new string('X', 100);
+
+        // Act
+        var options = CosmosOptionsHelper.CreateOptions(longComponent);
+
+        // Assert
+        Assert.True(options.ApplicationName!.Length <= 64,
+            $"ApplicationName length {options.ApplicationName.Length} exceeds max 64");
+    }
+
+    [Fact]
+    public void EnsureApplicationName_SetsName_WhenClientHasNone()
+    {
+        // Arrange
+        var clientOptions = new CosmosClientOptions();
+        Assert.Null(clientOptions.ApplicationName);
+
+        // Act
+        var options = CosmosOptionsHelper.CreateOptions("CosmosChatHistoryProvider");
+
+        // Assert - verify the returned options have ApplicationName set
+        Assert.NotNull(options.ApplicationName);
+        Assert.NotEmpty(options.ApplicationName);
+    }
+
+    [Fact]
+    public void CreateOptions_ApplicationName_ContainsVersion()
+    {
+        // Act
+        var options = CosmosOptionsHelper.CreateOptions("CosmosChatHistoryProvider");
+
+        // Assert - should contain a "/" followed by version info
+        Assert.Contains("/", options.ApplicationName);
+        var parts = options.ApplicationName!.Split('/');
+        Assert.Equal(2, parts.Length);
+        Assert.False(string.IsNullOrWhiteSpace(parts[1]), "Version portion should not be empty");
+    }
+}