Test/streak unit tests only v2

[sudeekshaballanda-hub]

Summary

Adds unit tests for the streak utilities (src/lib/streak-utils.ts) by importing the real functions instead of re-implementing them. This ensures the tests exercise the actual shipped code and can catch regressions.

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Closes # (no specific issue - this is a test improvement PR addressing feedback from #3131)

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Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that changes existing behavior)
• 📝 Documentation update
• ♻️ Refactor / code cleanup (no functional change)
• ⚡ Performance improvement
• 🔒 Security fix
• 🧪 Tests only

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What Changed

• Created test/streak/streak.test.ts: Unit tests for streak utilities
  • Imports calculateCurrentStreak and calculateLongestStreak from source (src/lib/streak-utils.ts)
  • Tests dynamic date logic (current streak based on today/yesterday)
  • Tests longest streak calculation with various patterns
  • Edge cases: empty arrays, duplicate dates, unsorted data, invalid dates
  • No local re-implementations - uses real functions

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How to Test

1. Run the unit tests:

   pnpm test test/streak/streak.test.ts
   

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Expected result:
✓ test/streak/streak.test.ts (15 tests) 20ms
✓ Streak Utilities (15)
✓ calculateCurrentStreak (7)
✓ returns 0 for empty contributions
✓ returns correct streak for consecutive days ending today
✓ returns 0 when last activity was more than 1 day ago
✓ handles Date objects
✓ handles unsorted dates
✓ handles duplicate dates
✓ returns 0 for invalid dates
✓ calculateLongestStreak (8)
✓ returns 0 for empty contributions
✓ returns correct longest streak
✓ handles single-day streaks
✓ handles all days with contributions
✓ handles Date objects
✓ handles unsorted dates
✓ handles duplicate dates
✓ ignores invalid dates

Screenshots / Recordings

This PR only adds tests, no UI changes.

Checklist

• Linked the related issue above
• Self-reviewed my own diff
• No unnecessary console.log, debug code, or commented-out blocks
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Added or updated tests where applicable
• Updated documentation / comments if behavior changed

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Accessibility (UI changes only)

This PR has no UI changes.

Additional Context

This PR addresses the feedback from the previous PR (#3131) by:
-Importing real functions from src/lib/streak-utils.ts
-Using the correct function signatures (Date[]/string[] array)
-Removing local re-implementations

The tests now properly exercise the shipped code and can catch regressions. This is a follow-up to the feedback provided in #3131.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[sudeekshaballanda-hub]

@Priyanshu-byte-coder This PR is ready for review. I'm a GSSoC contributor. Thanks!