fix(auto-instrumentations-node): make SIGTERM shutdown test more reliable (open-telemetry#2667)

Author: garysassano

metapackages/auto-instrumentations-node/test/test-app/app-server.js

@@ -17,22 +17,34 @@
 //Used in register.test.ts to mimic a JS app that stays alive like a server.
 const http = require('http');
 
-const options = {
-  hostname: 'example.com',
-  port: 80,
-  path: '/',
-  method: 'GET',
-};
+// Create a local server that responds immediately
+const server = http.createServer((req, res) => {
+  res.end('ok');
+});
+
+server.listen(0, () => {
+  const port = server.address().port;
+  const req = http.request({
+    hostname: 'localhost',
+    port: port,
+    path: '/',
+    method: 'GET',
+  });
 
-const req = http.request(options);
-req.end();
-req.on('close', () => {
-  console.log('Finished request');
+  req.end();
+  req.on('response', res => {
+    res.on('end', () => {
+      console.log('Finished request');
+    });
+    res.resume();
+  });
 });
 
 // Make sure there is work on the event loop
 const handle = setInterval(() => {}, 1);
+
 // Gracefully shut down
 process.on('SIGTERM', () => {
   clearInterval(handle);
+  server.close();
 });