Sweep: Create new endpoint for getting all books by category

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PR Feedback: 👍

Description

This pull request introduces a new endpoint to our book management application, allowing users to retrieve all books belonging to a specific category. It also includes validation to ensure the requested category exists and comprehensive tests to cover the new functionality.

Summary

• Added validation to the /books/category/:categoryName endpoint to check if the category exists before attempting to retrieve books. If the category does not exist, it returns a 404 status with an "Invalid category" message.
• Implemented a new test suite bookCategory.test.js to ensure the endpoint behaves as expected. This includes tests for:
  • Successfully retrieving books by a valid category.
  • Handling requests for categories that do not exist with appropriate error messages.
  • Ensuring the response structure matches the expected JSON format, including all relevant book details except for id and _v.
• Modified app.js to include the new validation logic and handle requests to the new endpoint.
• Utilized chai and chai-http for writing and executing the tests.

Files added/modified:

• app.js (modified)
• test/bookCategory.test.js (added)

Fixes #9.

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Rollback Files For Sweep

• [ ] Rollback changes to test/bookCategory.test.js
• [ ] Rollback changes to app.js

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Apply Sweep Rules to your PR?

• [ ] Apply: All docstrings and comments should be up to date.
• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

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