test: add comprehensive MCP tool and server configuration tests

- McpToolsTests: 33 tests covering tool registration, enum validation, state transitions, auth resolution (JWT, API key, X-Agent-Id), create/read/update/activity/handoff workflows via McpToolsFixture - McpServerConfigurationTests: 5 tests verifying MCP server DI registration, tool type attribute, MapMcp endpoint wiring, service extensions, and NuGet package reference
2026-07-13 08:10:36 +02:00
parent 17dc84082c
commit 77b9587fa6
2 changed files with 667 additions and 0 deletions
@@ -0,0 +1,85 @@
+using Microsoft.Extensions.DependencyInjection;
+using ModelContextProtocol.Server;
+using Nexus.Api.Services;
+using Xunit;
+
+namespace Nexus.Api.Tests;
+
+/// <summary>
+/// Verifies that the MCP server configuration is correct:
+/// all tools are registered, the streamable-http transport is configured
+/// via the service extensions, and MapMcp is called in Program.cs.
+/// </summary>
+public sealed class McpServerConfigurationTests
+{
+    [Fact]
+    public void McpServer_CanBeRegistered_WithoutError()
+    {
+        var services = new ServiceCollection();
+        services.AddLogging();
+        services.AddOptions();
+        services.AddHttpContextAccessor();
+
+        // Simulate what AddNexusApplicationServices does
+        services.AddMcpServer()
+            .WithHttpTransport(options => options.Stateless = true)
+            .WithTools<NexusMcpTools>();
+
+        // Build the container — this should not throw
+        var provider = services.BuildServiceProvider();
+
+        // Verify the ToolType is properly decorated
+        var attr = typeof(NexusMcpTools).GetCustomAttributes(
+            typeof(McpServerToolTypeAttribute), inherit: false);
+        Assert.Single(attr);
+    }
+
+    [Fact]
+    public void McpServer_ToolTypeAttribute_IsPresent()
+    {
+        var attr = typeof(NexusMcpTools).GetCustomAttributes(
+            typeof(McpServerToolTypeAttribute), inherit: false);
+        Assert.Single(attr);
+    }
+
+    [Fact]
+    public void McpEndpoint_MapMcp_IsCalledInProgram()
+    {
+        // Source path relative to the test output directory
+        var programPath = ResolveSourcePath("backend", "Program.cs");
+        Assert.True(File.Exists(programPath), $"Program.cs not found at {programPath}");
+        var source = File.ReadAllText(programPath);
+        Assert.Contains("MapMcp", source, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void McpServerRegistration_IsCalledInServiceExtensions()
+    {
+        var extPath = ResolveSourcePath("backend", "Extensions", "ServiceCollectionExtensions.cs");
+        Assert.True(File.Exists(extPath), $"ServiceCollectionExtensions.cs not found at {extPath}");
+        var source = File.ReadAllText(extPath);
+        Assert.Contains("AddMcpServer", source, StringComparison.Ordinal);
+        Assert.Contains("WithHttpTransport", source, StringComparison.Ordinal);
+        Assert.Contains("Stateless", source, StringComparison.Ordinal);
+        Assert.Contains("WithTools<NexusMcpTools>", source, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void NuGetPackage_ModelContextProtocol_AspNetCore_IsReferenced()
+    {
+        var csprojPath = ResolveSourcePath("backend", "Nexus.Api.csproj");
+        Assert.True(File.Exists(csprojPath), $"Nexus.Api.csproj not found at {csprojPath}");
+        var source = File.ReadAllText(csprojPath);
+        Assert.Contains("ModelContextProtocol.AspNetCore", source, StringComparison.Ordinal);
+    }
+
+    private static string ResolveSourcePath(params string[] segments)
+    {
+        // Navigate from test output directory to the repo root
+        // Test DLL is at: backend-tests/bin/Debug/net10.0/Nexus.Api.Tests.dll
+        // We go up 4 levels (net10.0 → Debug → bin → backend-tests) to reach repo root
+        var baseDir = AppContext.BaseDirectory;
+        var repoRoot = Path.GetFullPath(Path.Combine(baseDir, "..", "..", "..", ".."));
+        return Path.Combine(new[] { repoRoot }.Concat(segments).ToArray());
+    }
+}