Not returning mock data

Hi,
I am confused about why returning id that does not exist… If it helps, I already had an Apollo Studio acct

This is my server/index code:
const { ApolloServer } = require(‘apollo-server’);
const typeDefs = require(’./schema’);

const mocks = {
Query: () => ({
tracksForHome: () => […new Array(6)],
}),
Track: () => ({
id: () => ‘track_01’,
title: () => ‘Astro Kitty, Space Explorer’,
author: () => {
return {
name: ‘Grumpy Cat’,
photo:
https://res.cloudinary.com/dety84pbu/image/upload/v1606816219/kitty-veyron-sm_mctf3c.jpg’,
};
},
thumbnail: () =>
https://res.cloudinary.com/dety84pbu/image/upload/v1598465568/nebula_cat_djkt9r.jpg’,
length: () => 1210,
modulesCount: () => 6,
}),
};

const server = new ApolloServer({
typeDefs,
mocks: mocks
});

server.listen().then(() => {
console.log(server is running! Listening on port 4000 Query at https://studio.apollographql.com/dev
);
});

this is response in studio:

{
“data”: {
“tracksForHome”: [
{
“id”: “be8cec28-9c1b-43a2-8493-25b40ac076ee”
},
{
“id”: “56a13168-f238-49fe-bd11-33b8c10ff25e”
}
]
}
}