ECSoC_2026: Restore backend test runner and importable Express app

[Babin123456]

Problem

The repository contains backend tests, but npm test does not run them and server.js cannot be imported cleanly.

Current Behavior

npm test exits with the default placeholder error. Existing tests expect a createApp factory, but the backend starts immediately and exports nothing.

Why This Improvement Is Needed

Maintainers cannot verify backend behavior before merging API changes. This increases regression risk for URL scanning, scam detection, retry handling, and error responses.

Proposed Solution

Refactor server.js to expose createApp(options), keep direct node server.js startup behavior, and wire npm test to Node's built-in test runner.

Expected Outcome

Backend routes can be tested deterministically with injected API keys and mock fetch implementations.

Additional Notes

This keeps runtime compatibility while making the backend maintainable.

[Diwakar-odds]

Hi maintainers! 👋 I would love to be assigned to this issue for ECSoC 2026. I am highly interested in contributing this core backend infrastructure.

🔍 Understanding the Issue

The backend initializes immediately upon import, making it impossible to run
pm test deterministically or test routes in isolation without side effects.

🛠️ Proposed Implementation Plan

• Refactor server.js (or �pp.js) to export a createApp(options) factory function rather than invoking �pp.listen globally.
• Move the startup execution block into an if (require.main === module) guard to preserve
  ode server.js direct execution behavior.
• Wire up the existing test suite using Node's built-in test runner (
  ode --test), utilizing the factory function to inject mock dependencies and API keys.

📁 Files to be Modified/Created

• server.js - Refactor to factory pattern and add entrypoint guard.
• package.json - Update the est script to use
  ode --test.
• ests/backend.test.js - Refactor to import createApp properly.

✅ Expected Output

A fully operational, hermetic backend test suite that runs successfully in CI, allowing maintainers to safely verify API changes.

Please assign me so I can start working on the PR!