From f07cdd2cc7317a47870b3b15f1c3298a32883487 Mon Sep 17 00:00:00 2001
From: Santiago Gimeno <santiago.gimeno@gmail.com>
Date: Thu, 3 Dec 2020 10:38:28 +0100
Subject: [PATCH] test: fix child-process-pipe-dataflow

Make sure all the `wc` process stdout data is received before checking
its validity.

Fixes: https://github.com/nodejs/node/issues/25988
---
 test/parallel/test-child-process-pipe-dataflow.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/test/parallel/test-child-process-pipe-dataflow.js b/test/parallel/test-child-process-pipe-dataflow.js
index 5f425a6f3d087c..31846c8a715c4c 100644
--- a/test/parallel/test-child-process-pipe-dataflow.js
+++ b/test/parallel/test-child-process-pipe-dataflow.js
@@ -61,8 +61,13 @@ const MB = KB * KB;
     }));
   });
 
+  let wcBuf = '';
   wc.stdout.on('data', common.mustCall((data) => {
+    wcBuf += data;
+  }));
+
+  wc.on('close', common.mustCall(() => {
     // Grep always adds one extra byte at the end.
-    assert.strictEqual(data.toString().trim(), (MB + 1).toString());
+    assert.strictEqual(wcBuf.trim(), (MB + 1).toString());
   }));
 }