test: fix child-process-pipe-dataflow

Make sure all the `wc` process stdout data is received before checking its validity. Fixes: #25988 PR-URL: #36366 Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · Dec 21, 2020 · 166aa8a · 166aa8a
1 parent 6a6b3af
commit 166aa8a
Showing 1 changed file with 6 additions and 1 deletion.
diff --git 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());
   }));
 }