Fix more ports

Author: stephentoub

tests/ModelContextProtocol.Tests/SseIntegrationTests.cs

@@ -40,7 +40,7 @@ public async Task ConnectAndReceiveMessage_InMemoryServer()
             Name = "In-memory Test Server",
             TransportType = TransportTypes.Sse,
             TransportOptions = [],
-            Location = "http://localhost:5000/sse"
+            Location = $"http://localhost:{server.Port}/sse"
         };
 
         // Act
@@ -186,7 +186,7 @@ public async Task ConnectAndReceiveMessage_InMemoryServer_WithFullEndpointEventU
             Name = "In-memory Test Server",
             TransportType = TransportTypes.Sse,
             TransportOptions = [],
-            Location = "http://localhost:5000/sse"
+            Location = $"http://localhost:{server.Port}/sse"
         };
 
         // Act
@@ -225,7 +225,7 @@ public async Task ConnectAndReceiveNotification_InMemoryServer()
             Name = "In-memory Test Server",
             TransportType = TransportTypes.Sse,
             TransportOptions = [],
-            Location = "http://localhost:5000/sse"
+            Location = $"http://localhost:{server.Port}/sse"
         };
 
         // Act

tests/ModelContextProtocol.Tests/Utils/InMemoryTestSseServer.cs

@@ -26,6 +26,8 @@ public sealed class InMemoryTestSseServer : IAsyncDisposable
 
     public InMemoryTestSseServer(int port = 5000, ILogger<InMemoryTestSseServer>? logger = null)
     {
+        Port = port;
+
         _listener = new HttpListener();
         _listener.Prefixes.Add($"http://localhost:{port}/");
         _cts = new CancellationTokenSource();
@@ -35,6 +37,8 @@ public InMemoryTestSseServer(int port = 5000, ILogger<InMemoryTestSseServer>? lo
         _messagePath = "/message";
     }
 
+    public int Port { get; }
+
     /// <summary>
     /// This is to be able to use the full URL for the endpoint event.
     /// </summary>