chore: add test to client close

Co-authored-by: TomasRup <tomasr@wix.com>

Author: johnnyasantoss

src/integration-tests/process-cleanup.test.ts

@@ -4,7 +4,7 @@ import { StdioServerTransport } from '../server/stdio.js';
 describe('Process cleanup', () => {
     vi.setConfig({ testTimeout: 5000 }); // 5 second timeout
 
-    it('should exit cleanly after closing transport', async () => {
+    it('server should exit cleanly after closing transport', async () => {
         const server = new Server(
             {
                 name: 'test-server',

src/integration-tests/server-that-hangs.js

@@ -0,0 +1,21 @@
+import { setTimeout } from 'node:timers'
+import process from 'node:process'
+import { McpServer } from "../../dist/esm/server/mcp.js";
+import { StdioServerTransport } from "../../dist/esm/server/stdio.js";
+
+const transport = new StdioServerTransport();
+
+const server = new McpServer({
+  name: "server-that-hangs",
+  version: "1.0.0"
+});
+
+await server.connect(transport);
+
+const doNotExitImmediately = async () => {
+  setTimeout(() => process.exit(0), 30 * 1000);
+};
+
+process.stdin.on('close', doNotExitImmediately);
+process.on('SIGINT', doNotExitImmediately);
+process.on('SIGTERM', doNotExitImmediately);