test: add regression test for #11257

Refs: #11257

PR-URL: #20391
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

test/parallel/test-stdio-pipe-stderr.js

@@ -0,0 +1,37 @@
+'use strict';
+require('../common');
+const tmpdir = require('../common/tmpdir');
+const assert = require('assert');
+const fs = require('fs');
+const join = require('path').join;
+const spawn = require('child_process').spawnSync;
+
+// Test that invoking node with require, and piping stderr to file,
+// does not result in exception,
+// see: https://github.com/nodejs/node/issues/11257
+
+tmpdir.refresh();
+const fakeModulePath = join(tmpdir.path, 'batman.js');
+const stderrOutputPath = join(tmpdir.path, 'stderr-output.txt');
+// we need to redirect stderr to a file to produce #11257
+const stream = fs.createWriteStream(stderrOutputPath);
+
+// the error described in #11257 only happens when we require a
+// non-built-in module.
+fs.writeFileSync(fakeModulePath, '', 'utf8');
+
+stream.on('open', () => {
+  spawn(process.execPath, {
+    input: `require("${fakeModulePath.replace(/\\/g, '/')}")`,
+    stdio: ['pipe', 'pipe', stream]
+  });
+  const stderr = fs.readFileSync(stderrOutputPath, 'utf8').trim();
+  assert.strictEqual(
+    stderr,
+    '',
+    `piping stderr to file should not result in exception: ${stderr}`
+  );
+  stream.end();
+  fs.unlinkSync(stderrOutputPath);
+  fs.unlinkSync(fakeModulePath);
+});