Update test/model.updateOne.test.js

Co-authored-by: hasezoey <[email protected]>

Author: vkarpov15

test/model.updateOne.test.js

@@ -3091,6 +3091,7 @@ describe('model: updateOne: ', function() {
     assert.equal(doc.login.keys.length, 1);
     assert.equal(doc.login.keys[0].id, 'test2');
   });
+
   it('casts using overwritten discriminator key schema (gh-15051)', async function() {
     const embedDiscriminatorSchema = new mongoose.Schema({
       field1: String