test: AsyncLocalStorage works with thenables

This adds a test to verify that AsyncLocalStorage works with thenables.

PR-URL: nodejs#34008
Refs: nodejs#33778
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/async-hooks/test-async-local-storage-thenable.js

@@ -0,0 +1,53 @@
+'use strict';
+
+const common = require('../common');
+
+const assert = require('assert');
+const { AsyncLocalStorage } = require('async_hooks');
+
+// This test verifies that async local storage works with thenables
+
+const store = new AsyncLocalStorage();
+const data = Symbol('verifier');
+
+const then = common.mustCall((cb) => {
+  assert.strictEqual(store.getStore(), data);
+  setImmediate(cb);
+}, 4);
+
+function thenable() {
+  return {
+    then
+  };
+}
+
+// Await a thenable
+store.run(data, async () => {
+  assert.strictEqual(store.getStore(), data);
+  await thenable();
+  assert.strictEqual(store.getStore(), data);
+});
+
+// Returning a thenable in an async function
+store.run(data, async () => {
+  try {
+    assert.strictEqual(store.getStore(), data);
+    return thenable();
+  } finally {
+    assert.strictEqual(store.getStore(), data);
+  }
+});
+
+// Resolving a thenable
+store.run(data, () => {
+  assert.strictEqual(store.getStore(), data);
+  Promise.resolve(thenable());
+  assert.strictEqual(store.getStore(), data);
+});
+
+// Returning a thenable in a then handler
+store.run(data, () => {
+  assert.strictEqual(store.getStore(), data);
+  Promise.resolve().then(() => thenable());
+  assert.strictEqual(store.getStore(), data);
+});