Auth.js backend testing

[FernFinder]

Overview

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

Related Issue(s)

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

Added

• New file backend/tests/auth.test.js has unit tests for the entire auth.js file.

Changes

• backend/middleware/auth.js has been slightly modified so that the 401 errors are more specific.

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 for "Auth.js backend testing #133":

• Readability:
  Clear organization and meaningful error messages enhance understanding.

• Code Quality:
  Refinements to error handling increase specificity; well-crafted test suite.

• Testing:
  Comprehensive unit tests now ensure 100% coverage of authentication logic.

• Functionality:
  Specific error messages improve user feedback and debugging capability.

• Housekeeping:
  All modified files are relevant to the goal, and coding standards are maintained.

Additional Comments:

Great work on achieving full coverage!

We might want to create API document

[Alexmc567]

Pull Request Review:

• Readability: Great 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 increase coverage.

• Functionality: Adds tests that appear to function correctly.

• Housekeeping: No junk files, & lots of comments. No use of AI mentioned. Overall great contribution!