[IMPROVE]: Write Tests for Postman Requests

[ttebify]

Task Description:

This issue focuses on writing tests for all the Postman requests in the project. Writing tests will help ensure the reliability and correctness of the API endpoints, allowing for better validation of their functionality. The specific tasks to be performed are as follows:

Acceptance Criteria:

• Tests are written for all Postman requests in the project.
• Each test covers various scenarios and edge cases for the respective request.
• The tests execute successfully and produce the expected results.
• The Postman collection or workspace is updated with the newly written tests.