test: ensure findOne calls cursor.close

Author: nbbeeken

test/integration/crud/crud_api.test.ts

@@ -1,7 +1,14 @@
 import { expect } from 'chai';
 import { on } from 'events';
-
-import { type MongoClient, MongoError, ObjectId, ReturnDocument } from '../../mongodb';
+import * as sinon from 'sinon';
+
+import {
+  AbstractCursor,
+  type MongoClient,
+  MongoError,
+  ObjectId,
+  ReturnDocument
+} from '../../mongodb';
 import { assert as test } from '../shared';
 
 // instanceof cannot be use reliably to detect the new models in js due to scoping and new
@@ -31,6 +38,8 @@ describe('CRUD API', function () {
   });
 
   afterEach(async function () {
+    sinon.restore();
+
     await client?.close();
     client = null;
 
@@ -61,6 +70,12 @@ describe('CRUD API', function () {
     await client.close();
   });
 
+  it('findOne calls cursor.close()', async function () {
+    const spy = sinon.spy(AbstractCursor.prototype, 'close');
+    await client.db().collection('t').findOne({});
+    expect(spy).to.be.calledOnce;
+  });
+
   context('when creating a cursor with find', () => {
     let collection;