test: validate no debug info for http2

Refs: #31763

This test would have helped us catch the noisy output
from http2 earlier. Currently none of the tests
fail if there is unexpected debug output.

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: #37447
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>

Author: mhdawson

test/parallel/test-http2-clean-output.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const {
+  hasCrypto,
+  mustCall,
+  skip
+} = require('../common');
+if (!hasCrypto)
+  skip('missing crypto');
+
+const {
+  strictEqual
+} = require('assert');
+const {
+  createServer,
+  connect
+} = require('http2');
+const {
+  spawnSync
+} = require('child_process');
+
+// Validate that there is no unexpected output when
+// using http2
+if (process.argv[2] !== 'child') {
+  const {
+    stdout, stderr, status
+  } = spawnSync(process.execPath, [__filename, 'child'], { encoding: 'utf8' });
+  strictEqual(stderr, '');
+  strictEqual(stdout, '');
+  strictEqual(status, 0);
+} else {
+  const server = createServer();
+  server.listen(0, mustCall(() => {
+    const client = connect(`http://localhost:${server.address().port}`);
+    client.on('connect', mustCall(() => {
+      client.close();
+      server.close();
+    }));
+  }));
+}