chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIAgentMetadataTests.cs

@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Microsoft.Agents.AI.Abstractions.UnitTests;
+
+/// <summary>
+/// Unit tests for the <see cref="AIAgentMetadata"/> class.
+/// </summary>
+public class AIAgentMetadataTests
+{
+    [Fact]
+    public void Constructor_WithNoArguments_SetsProviderNameToNull()
+    {
+        // Arrange & Act
+        AIAgentMetadata metadata = new();
+
+        // Assert
+        Assert.Null(metadata.ProviderName);
+    }
+
+    [Fact]
+    public void Constructor_WithProviderName_SetsProperty()
+    {
+        // Arrange
+        const string ProviderName = "TestProvider";
+
+        // Act
+        AIAgentMetadata metadata = new(ProviderName);
+
+        // Assert
+        Assert.Equal(ProviderName, metadata.ProviderName);
+    }
+
+    [Fact]
+    public void Constructor_WithNullProviderName_SetsProviderNameToNull()
+    {
+        // Arrange & Act
+        AIAgentMetadata metadata = new(null);
+
+        // Assert
+        Assert.Null(metadata.ProviderName);
+    }
+}