diff --git a/test/objectid.test.js b/test/objectid.test.js
index bcc24a5e1..bb1eee6dd 100644
--- a/test/objectid.test.js
+++ b/test/objectid.test.js
@@ -11,6 +11,7 @@ let Book, Chapter;
 const ds = global.getDataSource();
 const objectIDLikeString = '7cd2ad46ffc580ba45d3cb1f';
 const objectIDLikeString2 = '7cd2ad46ffc580ba45d3cb1e';
+const promisify = require('bluebird').promisify;
 
 describe('ObjectID', function() {
   before(function() {
@@ -135,12 +136,16 @@ describe('ObjectID', function() {
         xidArr: [objectIDLikeString, objectIDLikeString2],
         title: 'arrayOfObjectID',
       });
-      const found = await Article.findOne({where: {title: 'arrayOfObjectID'}});
+      const found = await Article.find({where: {title: 'arrayOfObjectID'}});
       // the type of the returned array is actually string even it's stored as ObjectIds in the db as expected
-      found.xidArr.should.be.an.Array().which.containDeep([
+      found[0].xidArr.should.containDeep([
         new ds.ObjectID(objectIDLikeString),
         new ds.ObjectID(objectIDLikeString2),
       ]);
+      // check if the array is stored in ObjectId
+      const raw = await findRawModelDataAsync('ArticleC', found[0].id);
+      raw.xidArr[0].should.be.an.instanceOf(ds.ObjectID);
+      raw.xidArr[1].should.be.an.instanceOf(ds.ObjectID);
     });
 
     it('handles auto-generated PK properties defined in LB4 style', async () => {
@@ -193,4 +198,8 @@ describe('ObjectID', function() {
       found.xidArr.should.be.an.Array().which.containDeep([new ds.ObjectID(objectIDLikeString)]);
     });
   });
+  function findRawModelData(modelName, id, cb) {
+    ds.connector.execute(modelName, 'findOne', {_id: {$eq: id}}, {safe: true}, cb);
+  }
+  const findRawModelDataAsync = promisify(findRawModelData);
 });