Add comprehensive Jasmine backend test suite: User model, auth routes,Passport integration.

[amshula-05]

Related Issue

• Closes: 🚀 Feature: Add unit test cases using Jasmine framework #22

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Description

This PR introduces a robust Jasmine-based test suite for the backend of the project, ensuring reliability and maintainability of core authentication and user management features.

What’s Included

• Jasmine Setup:
  Jasmine is configured for backend testing, with support for .cjs test files.

• User Model Unit Tests:

  • Verifies password hashing on save
  • Ensures password is not re-hashed if not modified
  • Tests the comparePassword method for correct and incorrect passwords

• Auth Routes Integration Tests:

  • Signup: success and duplicate email cases
  • Login: success and failure (wrong password)
  • Logout: ensures session is properly destroyed

• Passport Integration:
  Passport’s local strategy, serialization, and deserialization are tested indirectly through the authentication route tests.

• Documentation:

  • README updated with clear instructions on installing dependencies, running tests, troubleshooting, and what is covered by the test suite.

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How to Test

1. Ensure MongoDB is running locally (mongod).
2. Install all dependencies:

   npm install
   npm install --save-dev jasmine @types/jasmine supertest express-session passport passport-local bcryptjs

3. Run the test suite:

   npx jasmine

4. All tests should pass with no failures.

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How Has This Been Tested?

Automated Jasmine Test Suite:

• All backend tests were run using the Jasmine test runner (npx jasmine).
• User model unit tests: Verified password hashing, schema validation, and password comparison logic.

Auth route integration tests:

• Simulated HTTP requests for signup, login, and logout using Supertest, ensuring correct responses and database changes.

Test Environment:

• Local MongoDB instance (mongodb://127.0.0.1:27017/github_tracker_test) was used for all tests.
• Each test suite cleans up the database after execution to ensure isolation and repeatability.

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Screenshots (if applicable)

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Type of Change

• Bug fix
• New feature
• Code style update
• Breaking change
• Documentation update

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