PR feedback: Move test to StreamableHttpServerConformanceTests

Author: MackinnonBuck

tests/ModelContextProtocol.AspNetCore.Tests/MapMcpStreamableHttpTests.cs

@@ -547,29 +547,4 @@ public async Task DisposeAsync_DoesNotHang_WhenOwnsSessionIsFalse_WithUnsolicite
         // Dispose should still not hang
         await client.DisposeAsync().AsTask().WaitAsync(TimeSpan.FromSeconds(10), TestContext.Current.CancellationToken);
     }
-
-    [Fact]
-    public async Task PostWithoutSessionId_NonInitializeRequest_Returns400()
-    {
-        Assert.SkipWhen(Stateless, "Stateless mode allows any request without a session ID.");
-
-        Builder.Services.AddMcpServer().WithHttpTransport();
-
-        await using var app = Builder.Build();
-        app.MapMcp();
-
-        await app.StartAsync(TestContext.Current.CancellationToken);
-
-        // Send a tools/call without a session ID. This should be rejected.
-        HttpClient.DefaultRequestHeaders.Accept.Add(new("application/json"));
-        HttpClient.DefaultRequestHeaders.Accept.Add(new("text/event-stream"));
-
-        var content = new StringContent(
-            """{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}""",
-            System.Text.Encoding.UTF8,
-            "application/json");
-
-        using var response = await HttpClient.PostAsync("http://localhost:5000/", content, TestContext.Current.CancellationToken);
-        Assert.Equal(System.Net.HttpStatusCode.BadRequest, response.StatusCode);
-    }
 }

tests/ModelContextProtocol.AspNetCore.Tests/StreamableHttpServerConformanceTests.cs

@@ -175,6 +175,15 @@ public async Task PostRequest_IsNotFound_WithUnrecognizedSessionId()
         Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
     }
 
+    [Fact]
+    public async Task PostWithoutSessionId_NonInitializeRequest_Returns400()
+    {
+        await StartAsync();
+
+        using var response = await HttpClient.PostAsync("", JsonContent(ListToolsRequest), TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+    }
+
     [Fact]
     public async Task InitializeRequest_Matches_CustomRoute()
     {
@@ -660,6 +669,10 @@ private static async Task<JsonRpcResponse> AssertSingleSseResponseAsync(HttpResp
         {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"IntegrationTestClient","version":"1.0.0"}}}
         """;
 
+    private static string ListToolsRequest => """
+        {"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}
+        """;
+
     private long _lastRequestId = 1;
     private string EchoRequest
     {