Fix failing tests and lint errors in PrepPilot

[saidai-bhuvanesh]

Issue Description

The PrepPilot project has multiple failing tests and lint errors that need to be addressed.

Backend Test Failures

The backend has 43 failing tests out of 208 total tests (165 passing).

Failed Test Files

1. tests/authController.deleteAccount.cascade.unit.test.js - 4 failures

   • Account deletion cascade tests failing

2. tests/authController.register.login.unit.test.js - 9 failures

   • Registration and login validation tests failing
   • Password policy validation issues
   • Token generation failures

3. tests/changePassword.policy.unit.test.js - 9 failures

   • Password policy enforcement tests failing
   • Missing default export in mock

4. tests/resumeRoutes.auth.unit.test.js - 12 failures

   • Missing protect middleware in route definitions
   • Missing aiLimiter middleware
   • Middleware ordering issues

5. tests/achievementController.unit.test.js - 4 failures

   • Achievement unlock tests failing
   • Database update issues

6. tests/questionController.ownership.unit.test.js - 3 failures

   • Session ownership validation failing
   • ObjectId casting errors

7. tests/authController.tokens.unit.test.js - 2 failures

   • Token rotation tests failing

Key Error Patterns

1. Mock Configuration Issues

   • Missing default exports in mocked modules
   • Example: No "default" export is defined on the "../models/User.js" mock

2. Middleware Missing from Routes

   • protect middleware not found in route stacks
   • aiLimiter middleware not applied

3. ObjectId Casting Errors

   • Session IDs not being cast properly to ObjectId
   • Example: Cast to ObjectId failed for value "sessionid123"

Frontend Lint Errors

The frontend has 52 lint errors and 8 warnings:

Critical Errors (52)

• Unused variable declarations (motion, Icon)
• Missing React hook dependencies

Warnings (8)

• React Hook useEffect missing dependencies
• React Hook useMemo missing dependencies

Affected Files

• src/pages/OpenSource/OpenSourceEvents.jsx
• src/pages/OpenSource/RepositoryHive.jsx
• src/pages/PreparationCalendar/PreparationCalendar.jsx
• src/pages/ProjectRoadmap/components/RoadmapDetail.jsx
• src/pages/StudyTimer/StudyTimer.jsx

E2E Verification Results

Backend

Check	Status	Details
npm test	FAIL	43 failed, 165 passed
npm run lint	N/A	No lint script

Frontend

Check	Status	Details
npm test	PASS	4 tests passed
npm run lint	FAIL	52 errors, 8 warnings
npm run build	PASS	Built successfully

Root Cause Analysis

1. Test Failures:

   • Missing or incorrect mock configurations
   • Middleware not properly applied to routes
   • Test assertions out of sync with implementation

2. Lint Errors:

   • Unused imports not removed
   • React hook dependency arrays incomplete

Recommended Fixes

Backend

1. Add default exports to mocked modules
2. Add protect and aiLimiter middleware to resume routes
3. Fix ObjectId casting in session validation
4. Update test assertions to match current implementation

Frontend

1. Remove unused imports (motion, Icon)
2. Add missing dependencies to React hooks
3. Run npm run lint --fix for auto-fixable issues

Impact

• Test Coverage: 79% passing (165/208 tests)
• Code Quality: 52 lint errors need attention
• Build Status: Frontend builds successfully
• Functionality: Multiple features may be broken due to middleware issues

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This issue was created by an automated e2e verification process.