fs: promisify exists correctly

PR-URL: https://github.com/nodejs/node/pull/13316
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Vladimir Kurchatkin <vladimir.kurchatkin@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/test/parallel/test-fs-promisified.js b/test/parallel/test-fs-promisified.js
index 12bd5d6fa1..ac6e22f969 100644
--- a/test/parallel/test-fs-promisified.js
+++ b/test/parallel/test-fs-promisified.js
@@ -9,6 +9,7 @@ common.crashOnUnhandledRejection();
 
 const read = promisify(fs.read);
 const write = promisify(fs.write);
+const exists = promisify(fs.exists);
 
 {
   const fd = fs.openSync(__filename, 'r');
@@ -29,3 +30,9 @@ common.refreshTmpDir();
     fs.closeSync(fd);
   }));
 }
+
+{
+  exists(__filename).then(common.mustCall((x) => {
+    assert.strictEqual(x, true);
+  }));
+}