Add client-side Streamable HTTP transport support (#356)

tests/ModelContextProtocol.AspNetCore.Tests/MapMcpSseTests.cs

@@ -0,0 +1,68 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using ModelContextProtocol.Client;
+
+namespace ModelContextProtocol.AspNetCore.Tests;
+
+public class MapMcpSseTests(ITestOutputHelper outputHelper) : MapMcpTests(outputHelper)
+{
+    protected override bool UseStreamableHttp => false;
+
+    [Theory]
+    [InlineData("/a", "/a/sse")]
+    [InlineData("/a/", "/a/sse")]
+    [InlineData("/a/b", "/a/b/sse")]
+    public async Task CanConnect_WithMcpClient_AfterCustomizingRoute(string routePattern, string requestPath)
+    {
+        Builder.Services.AddMcpServer(options =>
+        {
+            options.ServerInfo = new()
+            {
+                Name = "TestCustomRouteServer",
+                Version = "1.0.0",
+            };
+        }).WithHttpTransport();
+        await using var app = Builder.Build();
+
+        app.MapMcp(routePattern);
+
+        await app.StartAsync(TestContext.Current.CancellationToken);
+
+        var mcpClient = await ConnectAsync(requestPath);
+
+        Assert.Equal("TestCustomRouteServer", mcpClient.ServerInfo.Name);
+    }
+
+    [Fact]
+    public async Task Can_UseHttpContextAccessor_InTool()
+    {
+        Builder.Services.AddMcpServer().WithHttpTransport().WithTools<EchoHttpContextUserTools>();
+
+        Builder.Services.AddHttpContextAccessor();
+
+        await using var app = Builder.Build();
+
+        app.Use(next =>
+        {
+            return async context =>
+            {
+                context.User = CreateUser("TestUser");
+                await next(context);
+            };
+        });
+
+        app.MapMcp();
+
+        await app.StartAsync(TestContext.Current.CancellationToken);
+
+        var mcpClient = await ConnectAsync();
+
+        var response = await mcpClient.CallToolAsync(
+            "EchoWithUserName",
+            new Dictionary<string, object?>() { ["message"] = "Hello world!" },
+            cancellationToken: TestContext.Current.CancellationToken);
+
+        var content = Assert.Single(response.Content);
+        Assert.Equal("TestUser: Hello world!", content.Text);
+    }
+}