async_hooks: adding regression test case for async/await

The actual bug was fixed by a V8 update in Node v10.4.0.

See: #19989
PR-URL: #22374
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: antsmartian

test/parallel/test-async-hooks-async-await.js

@@ -0,0 +1,26 @@
+// Test async-hooks fired on right
+// asyncIds & triggerAsyncId for async-await
+'use strict';
+
+require('../common');
+const async_hooks = require('async_hooks');
+const assert = require('assert');
+
+const asyncIds = [];
+async_hooks.createHook({
+  init: (asyncId, type, triggerAsyncId) => {
+    asyncIds.push([triggerAsyncId, asyncId]);
+  }
+}).enable();
+
+async function main() {
+  await null;
+}
+
+main().then(() => {
+  // Verify the relationships between async ids
+  // 1 => 2, 2 => 3 etc
+  assert.strictEqual(asyncIds[0][1], asyncIds[1][0]);
+  assert.strictEqual(asyncIds[0][1], asyncIds[3][0]);
+  assert.strictEqual(asyncIds[1][1], asyncIds[2][0]);
+});