From ef0f5b185d318c48f4331797e7be86241d676902 Mon Sep 17 00:00:00 2001
From: ZauberNerd <zaubernerd@zaubernerd.de>
Date: Wed, 2 Dec 2020 23:04:15 +0100
Subject: [PATCH] test: add test for async contexts in PerformanceObserver

This test proves that the PerformanceObserver callback gets called with
the async context of the callsite of performance.mark()/measure() and
therefore AsyncLocalStorage can be used inside a PerformanceObserver.

PR: https://github.com/nodejs/node/pull/36343

PR-URL: https://github.com/nodejs/node/pull/36343
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
---
 .../test-performanceobserver-asynccontext.js  | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 test/parallel/test-performanceobserver-asynccontext.js

diff --git a/test/parallel/test-performanceobserver-asynccontext.js b/test/parallel/test-performanceobserver-asynccontext.js
new file mode 100644
index 00000000000000..d3b5bec925d2c3
--- /dev/null
+++ b/test/parallel/test-performanceobserver-asynccontext.js
@@ -0,0 +1,37 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const {
+  performance,
+  PerformanceObserver,
+} = require('perf_hooks');
+const {
+  executionAsyncId,
+  triggerAsyncId,
+  executionAsyncResource,
+} = require('async_hooks');
+
+// Test Non-Buffered PerformanceObserver retains async context
+{
+  const observer =
+    new PerformanceObserver(common.mustCall(callback));
+
+  const initialAsyncId = executionAsyncId();
+  let asyncIdInTimeout;
+  let asyncResourceInTimeout;
+
+  function callback(list) {
+    assert.strictEqual(triggerAsyncId(), initialAsyncId);
+    assert.strictEqual(executionAsyncId(), asyncIdInTimeout);
+    assert.strictEqual(executionAsyncResource(), asyncResourceInTimeout);
+    observer.disconnect();
+  }
+  observer.observe({ entryTypes: ['mark'] });
+
+  setTimeout(() => {
+    asyncIdInTimeout = executionAsyncId();
+    asyncResourceInTimeout = executionAsyncResource();
+    performance.mark('test1');
+  }, 0);
+}