From 1b19af2ed50a9c25d1cd1f4c3112a18b1059402b Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Mon, 7 Sep 2020 16:32:47 -0400
Subject: [PATCH] test(schema): repro #9390

---
 test/schema.test.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/schema.test.js b/test/schema.test.js
index 1664f99d0a9..912340efd56 100644
--- a/test/schema.test.js
+++ b/test/schema.test.js
@@ -739,11 +739,17 @@ describe('schema', function() {
       }, { _id: true });
       assert.ok(schema.path('_id') instanceof Schema.ObjectId);
 
+      schema.set('_id', false);
+      assert.ok(schema.path('_id') == null);
+
       schema = new Schema({
         name: String
       }, { _id: false });
       assert.equal(schema.path('_id'), undefined);
 
+      schema.set('_id', true);
+      assert.ok(schema.path('_id') instanceof Schema.ObjectId);
+
       // old options
       schema = new Schema({
         name: String