child_process: support promisified `exec(File)`

Author: Benjamin Gruenbaum <inglor@gmail.com>
Author: Anna Henningsen <anna@addaleax.net>

PR-URL: https://github.com/nodejs/node/pull/12442
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: William Kapke <william.kapke@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/test/parallel/test-child-process-promisified.js b/test/parallel/test-child-process-promisified.js
new file mode 100644
index 0000000000..322cb110eb
--- /dev/null
+++ b/test/parallel/test-child-process-promisified.js
@@ -0,0 +1,34 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const child_process = require('child_process');
+const { promisify } = require('util');
+
+common.crashOnUnhandledRejection();
+
+const exec = promisify(child_process.exec);
+const execFile = promisify(child_process.execFile);
+
+{
+  exec(`${process.execPath} -p 42`).then(common.mustCall((obj) => {
+    assert.deepStrictEqual(obj, { stdout: '42\n', stderr: '' });
+  }));
+}
+
+{
+  execFile(process.execPath, ['-p', '42']).then(common.mustCall((obj) => {
+    assert.deepStrictEqual(obj, { stdout: '42\n', stderr: '' });
+  }));
+}
+
+{
+  exec('doesntexist').catch(common.mustCall((err) => {
+    assert(err.message.includes('doesntexist'));
+  }));
+}
+
+{
+  execFile('doesntexist', ['-p', '42']).catch(common.mustCall((err) => {
+    assert(err.message.includes('doesntexist'));
+  }));
+}