chore: introduce capabilities argument (#135)

tests/sse.spec.ts

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { spawn } from 'node:child_process';
+import path from 'node:path';
+import { test } from './fixtures';
+
+test('sse transport', async () => {
+  const cp = spawn('node', [path.join(__dirname, '../cli.js'), '--port', '0'], { stdio: 'pipe' });
+  try {
+    let stdout = '';
+    const url = await new Promise<string>(resolve => cp.stdout?.on('data', data => {
+      stdout += data.toString();
+      const match = stdout.match(/Listening on (http:\/\/.*)/);
+      if (match)
+        resolve(match[1]);
+    }));
+
+    // need dynamic import b/c of some ESM nonsense
+    const { SSEClientTransport } = await import('@modelcontextprotocol/sdk/client/sse.js');
+    const { Client } = await import('@modelcontextprotocol/sdk/client/index.js');
+    const transport = new SSEClientTransport(new URL(url));
+    const client = new Client({ name: 'test', version: '1.0.0' });
+    await client.connect(transport);
+    await client.ping();
+  } finally {
+    cp.kill();
+  }
+});