TEST009: Add recommendation engine functional test and report

[Aarya1801]

Ticket

TEST009 – Recommendation Engine Functional Testing

• TEST009

Description

This PR adds a functional test script (scripts/test_recommendation_engine.js) and a detailed markdown report (scripts/TEST009_recommendation_engine_test_report.md) for the backend recommendation engine. The test verifies that recommendations are correctly filtered and logically ranked for a sample user profile and product set, as per the acceptance criteria.

No errors were found during testing, and no existing code needed to be changed. Only a new test script and report were added.

How to test/review:

• Run the script with node scripts/test_recommendation_engine.js.
• Review the output and the markdown report for test results, steps, and findings.

Checks

• All requirements of the ticket have been implemented, or I have commented on any exclusions
• Unit tests have been added or updated for any backend changes (if applicable)
• I have reviewed the Files Changed tab and verified it only contains relevant changes (comment if unsure about any)
• This PR has been reviewed and approved