Create route test for controllers

Create routes test for controllers of **notes** and **users** modules.

**Tasks**
- [ ] #32
- [ ] #33

**Solution**
Mock the crud operations of the **Rest API Modules** and test for all cases.

**Alternatives**
Create an end-to-end test for the controllers.

**Additional context**
Make sure to cover every part or scenario of the controller to achieve full test coverage.