chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Hyperlight.UnitTests/ToolBridgeTests.cs

@@ -0,0 +1,71 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Microsoft.Agents.AI.Hyperlight.Internal;
+using Microsoft.Extensions.AI;
+
+namespace Microsoft.Agents.AI.Hyperlight.UnitTests;
+
+public sealed class ToolBridgeTests
+{
+    [Fact]
+    public async Task InvokeAsync_PassesArgumentsAndReturnsSerializedResultAsync()
+    {
+        // Arrange
+        static string Echo(string value) => $"echo:{value}";
+        var tool = AIFunctionFactory.Create(Echo, name: "echo");
+
+        // Act
+        var result = await ToolBridge.InvokeAsync(tool, """{"value":"hello"}""");
+
+        // Assert — AIFunction.InvokeAsync returns the string; ToolBridge JSON-encodes it.
+        Assert.Equal("\"echo:hello\"", result);
+    }
+
+    [Fact]
+    public async Task InvokeAsync_ReturnsErrorJsonOnExceptionAsync()
+    {
+        // Arrange
+        static int Boom() => throw new InvalidOperationException("nope");
+        var tool = AIFunctionFactory.Create(Boom, name: "boom");
+
+        // Act
+        var result = await ToolBridge.InvokeAsync(tool, "{}");
+
+        // Assert
+        using var doc = JsonDocument.Parse(result);
+        Assert.True(doc.RootElement.TryGetProperty("error", out var err));
+        Assert.Contains("nope", err.GetString()!);
+    }
+
+    [Fact]
+    public async Task InvokeAsync_EmptyArguments_InvokesToolWithNoArgsAsync()
+    {
+        // Arrange
+        static string Hi() => "hi";
+        var tool = AIFunctionFactory.Create(Hi, name: "hi");
+
+        // Act
+        var result = await ToolBridge.InvokeAsync(tool, string.Empty);
+
+        // Assert
+        Assert.Equal("\"hi\"", result);
+    }
+
+    [Fact]
+    public async Task InvokeAsync_NonObjectJson_ReturnsErrorAsync()
+    {
+        // Arrange
+        static string Hi() => "hi";
+        var tool = AIFunctionFactory.Create(Hi, name: "hi");
+
+        // Act
+        var result = await ToolBridge.InvokeAsync(tool, "[1, 2, 3]");
+
+        // Assert
+        using var doc = JsonDocument.Parse(result);
+        Assert.True(doc.RootElement.TryGetProperty("error", out _));
+    }
+}