Create integration test for User API Endpoints

[dannyprikaz]

Overview

Create integration tests for all CRUD operations relevant to user API endpoints

Action Items

• Create integration tests for all CRUD operations relevant to user API endpoints (see ./backend/routers/users.router.js)
• If you run into any questions, add a comment to the issue and tag "@dannyprikaz"

Resources/Instructions

https://jestjs.io/docs/getting-started

• This issue is part of the epic: Epic: Write new backend integration tests for router-controller-model flow #1899