App.js backend testing

[FernFinder]

Overview

• This pull request increases coverage of the backend app.js file to 100%.

Related Issue(s)

• Progress on Backend Unit Testing and coverage lacking #126.

Added

• New file backend/tests/app.test.js has unit tests for the entire app.js file.
• New file backend/tests/connectdb.test.js has a unit test for testing database connection

Changes

• backend/app.js has been slightly modified so that the error handler is simpler.

Screenshots

Instructions for Testing

• Run npm run coverage on backend.

Checklist before Merging

• I have performed a self-review of my own code.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate).
• I have ensured the changes adhere to the project's coding standards and guidelines.

[dusek2]

Pull Request Review

• Readability:
  Clear organization of tests and effective use of stubs to isolate functionality.

• Code Quality:
  Simplification of error handling enhances clarity; thorough unit testing is in place.

• Testing:
  All relevant app.js routes were tested, achieving great coverage, including edge cases.

• Functionality:
  Error handling improvements should enhance user experience during failures.

• Housekeeping:
  Comprehensive tests were added for app.js and database connectivity, adhering to best practices.

Additional Comments:

Consider double-checking the undefined status in the database connection failure test for accuracy.

This puts us over 70% on coverage!

[Alexmc567]

Pull Request Review:

• Readability: Good description and well documented.

• Code Quality: Code appears to be of high quality and is consistent with the project.

• Testing: Testing instructions provided. Tests do work and increase coverage.

• Functionality: Adds tests that appear to function correctly.

• Housekeeping: No junk files, & lots of comments. No AI use mentioned. Great addition!