From d0f68a398e9041f24d77ed4525c2675b48ee3c95 Mon Sep 17 00:00:00 2001
From: Luigi Pinca <luigipinca@gmail.com>
Date: Fri, 18 Feb 2022 12:43:27 +0100
Subject: [PATCH] test: deflake test-common-expect-warning

The subprocess might exit before the data is flushed. Run the assertion
after the `'end'` event is emitted.

PR-URL: https://github.com/nodejs/node/pull/42046
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
---
 test/parallel/test-common-expect-warning.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/parallel/test-common-expect-warning.js b/test/parallel/test-common-expect-warning.js
index be3e385b11e0f4..dff32037fbb5b1 100644
--- a/test/parallel/test-common-expect-warning.js
+++ b/test/parallel/test-common-expect-warning.js
@@ -36,9 +36,11 @@ if (process.argv[2] !== 'child') {
     child.stderr.on('data', (data) => {
       stderr += data;
     });
+    child.stderr.on('end', common.mustCall(() => {
+      assert.match(stderr, /Unexpected extra warning received/);
+    }));
     child.on('exit', common.mustCall((status) => {
       assert.notStrictEqual(status, 0);
-      assert.match(stderr, /Unexpected extra warning received/);
     }));
   }
 } else {