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Credit System Test Results

Automated Test Results ✅

All automated tests for the credit system have PASSED.

Test Suite Summary

✅ Test 1: Credit Costs Configuration

  • All credit costs are properly defined
  • Resume: 1 credit
  • Presentation: 1 credit per slide
  • Diagram: 1 credit
  • Letter: 1 credit
  • ATS Check: 1 credit
  • Cover Letter: 1 credit

✅ Test 2: Credit Calculation Logic

All test cases passed:

  • Total: 20, Used: 5 → Remaining: 15 ✓
  • Total: 20, Used: 20 → Remaining: 0 ✓
  • Total: 20, Used: 25 → Remaining: 0 (correctly handles negative) ✓
  • Total: 100, Used: 0 → Remaining: 100 ✓

✅ Test 3: Credit Reset Logic

  • Future date (30 days ahead): Does not reset ✓
  • Past date (1 day ago): Triggers reset ✓

✅ Test 4: Endpoint Implementation Verification

All 5 endpoints have been verified to include:

1. Diagram Generation (/api/generate/diagram/route.ts)

  • ✓ Authentication check
  • ✓ Credit balance check
  • ✓ Credit deduction
  • ✓ Usage logging

2. Letter Generation (/api/generate/letter/route.ts)

  • ✓ Authentication check
  • ✓ Credit balance check
  • ✓ Credit deduction
  • ✓ Usage logging

3. ATS Analysis (/api/analyze-ats/route.ts)

  • ✓ Authentication check
  • ✓ Credit balance check
  • ✓ Credit deduction
  • ✓ Usage logging

4. Resume ATS Score (/api/resume/ats-score/route.ts)

  • ✓ Authentication check
  • ✓ Credit balance check
  • ✓ Credit deduction
  • ✓ Usage logging

5. Presentation Generation (/api/generate/presentation/route.ts)

  • ✓ Authentication check
  • ✓ Credit balance check
  • ✓ Credit deduction
  • ✓ Usage logging

✅ Test 5: Presentation-Specific Logic

  • 5 slides → 5 credits ✓
  • 10 slides → 10 credits ✓
  • 1 slide → 1 credit ✓
  • 100 slides → 100 credits ✓
  • Rejects slide count of 0 ✓
  • Rejects slide count over 100 ✓

Manual Testing Guide

To thoroughly test the credit deduction functionality in a live environment, follow these steps:

Prerequisites

  1. Have a test user account with sufficient credits (at least 20)
  2. Access to the Supabase database to verify credit changes
  3. API client (Postman, curl, or browser dev tools) for testing

Test Cases

Test Case 1: Diagram Generation

Steps:

  1. Note current credit balance
  2. Generate a diagram via /api/generate/diagram
  3. Verify credits decreased by 1
  4. Check credit_usage_log table for entry

Expected Result:

  • Status: 200 OK
  • Credits used: 1
  • Database shows credit deduction
  • Usage log entry created

Test Case 2: Letter Generation

Steps:

  1. Note current credit balance
  2. Generate a letter via /api/generate/letter
  3. Verify credits decreased by 1
  4. Check credit_usage_log table for entry

Expected Result:

  • Status: 200 OK
  • Credits used: 1
  • Database shows credit deduction
  • Usage log entry created

Test Case 3: ATS Analysis

Steps:

  1. Note current credit balance
  2. Analyze resume via /api/analyze-ats
  3. Verify credits decreased by 1
  4. Check credit_usage_log table for entry

Expected Result:

  • Status: 200 OK
  • Credits used: 1
  • Database shows credit deduction
  • Usage log entry created

Test Case 4: Resume ATS Score

Steps:

  1. Note current credit balance
  2. Calculate ATS score via /api/resume/ats-score
  3. Verify credits decreased by 1
  4. Check credit_usage_log table for entry

Expected Result:

  • Status: 200 OK
  • Credits used: 1
  • Database shows credit deduction
  • Usage log entry created

Test Case 5: Presentation Generation (Multiple Slides)

Steps:

  1. Note current credit balance
  2. Generate 5-slide presentation via /api/generate/presentation
  3. Verify credits decreased by 5
  4. Check credit_usage_log table for entry

Expected Result:

  • Status: 200 OK
  • Credits used: 5 (1 per slide)
  • Database shows credit deduction
  • Usage log entry created with slide count

Test Case 6: Insufficient Credits

Steps:

  1. Set user credits to 0 or less than required
  2. Attempt to generate any content
  3. Verify error response

Expected Result:

  • Status: 402 Payment Required
  • Error message: "Not enough credits"
  • No credit deduction
  • No content generated

Test Case 7: Unauthenticated Request

Steps:

  1. Make request without Bearer token
  2. Verify error response

Expected Result:

  • Status: 401 Unauthorized
  • Error message: "Authentication required"
  • No credit deduction

Test Case 8: Invalid Bearer Token

Steps:

  1. Make request with invalid/expired token
  2. Verify error response

Expected Result:

  • Status: 401 Unauthorized
  • Error message: "Authentication required"
  • No credit deduction

Credit Reset Logic

✅ Monthly Calendar Reset (1st of Each Month)

Credits reset on the 1st day of each calendar month at 00:00:00 UTC, ensuring users get their full monthly credit allowance consistently.

How It Works:

  1. When a user first uses the service (or when credits are created), credits_reset_at is set to the 1st day of the next month
  2. Before each generation request, the system checks if the current date has passed the reset date
  3. If yes, credits_used is reset to 0 and credits_reset_at is updated to the 1st of the next month
  4. This ensures credits reset monthly on the 1st, giving users their full monthly allowance

Example Timeline:

  • Jan 5: User signs up, gets 20 credits, reset_at = Feb 1
  • Jan 20: User has 10 credits left
  • Feb 1: Credits automatically reset to 20, reset_at = Mar 1
  • Feb 15: User has 15 credits left
  • Mar 1: Credits automatically reset to 20, reset_at = Apr 1

Test Results:

  • ✅ Reset date correctly calculated as 1st of next month at 00:00 UTC
  • ✅ Verified across different dates (mid-month, end-of-month, year transitions)
  • ✅ Free tier: 20 credits per month (confirmed)
  • ✅ Past reset dates correctly trigger credit reset
  • ✅ Future reset dates correctly prevent premature reset

Database Verification Queries

Check User Credits

SELECT * FROM user_credits WHERE user_id = '<user_id>';

Check Usage Log

SELECT * FROM credit_usage_log 
WHERE user_id = '<user_id>' 
ORDER BY created_at DESC 
LIMIT 10;

Verify Credit Deduction

SELECT 
  uc.user_id,
  uc.credits_total,
  uc.credits_used,
  (uc.credits_total - uc.credits_used) as credits_remaining,
  COUNT(cul.id) as total_actions,
  SUM(cul.credits_used) as total_credits_logged
FROM user_credits uc
LEFT JOIN credit_usage_log cul ON uc.user_id = cul.user_id
WHERE uc.user_id = '<user_id>'
GROUP BY uc.user_id, uc.credits_total, uc.credits_used;

Security Verification

✅ Verified Security Measures

  1. Authentication: All endpoints require valid Bearer token
  2. No Hardcoded Keys: Removed hardcoded API key fallback
  3. API Key Validation: Checks API key availability before processing
  4. SQL Injection: Uses parameterized queries via Supabase
  5. Race Conditions: Refetches credits before deduction in presentation route

✅ CodeQL Security Scan

  • Status: PASSED
  • Vulnerabilities Found: 0
  • Date: 2026-01-06

Performance Considerations

Database Operations per Request

  1. Authentication: 1 query (getUser)
  2. Credit Check: 1-2 queries (select, possible insert/update for reset)
  3. Content Generation: Variable (external API calls)
  4. Credit Deduction: 2 queries (select for refetch, update)
  5. Usage Logging: 1 query (insert)

Total: ~5-7 database operations per generation request

Optimization Opportunities

  • Credits are fetched twice (initial check + refetch) to prevent race conditions
  • Consider using database transactions for atomic operations
  • Cache credit data for short periods (with caution)

Known Limitations

  1. Content Generated but Logging Failed: If credit deduction fails after content generation, user receives content with warning message. This is intentional to prioritize user experience.

  2. No Rollback on Failure: If an error occurs after credit deduction but before content generation completes, credits are not automatically rolled back. Manual intervention may be required.

  3. Concurrent Requests: Multiple simultaneous requests from same user may cause race conditions despite refetch logic. Consider implementing request locking for heavy concurrent usage.

Conclusion

✅ All automated tests PASSED ✅ All 5 endpoints properly implement credit system ✅ Security scan shows 0 vulnerabilities ✅ ESLint shows 0 warnings/errors

The credit deduction system is READY FOR PRODUCTION pending manual testing validation.

Test Execution Log

Date: 2026-01-06
Tester: GitHub Copilot Agent
Test Script: test-credits-system.js
Result: ALL TESTS PASSED ✅