test: add unit tests for streak calculation utility functions

[Priyanshu-byte-coder]

Testing Request

What tests are missing?
The streak calculation logic (current streak, longest streak, streak at risk) is a core feature of DevTrack but appears to lack comprehensive unit tests. These functions are business-critical — a bug here directly impacts user trust.

Proposed Tests

describe('streak calculations', () => {
  it('returns 0 for empty commit history')
  it('counts consecutive days correctly')
  it('resets streak on missed day')
  it('handles streak freeze correctly (frozen day should not break streak)')
  it('calculates longest streak from history')
  it('detects streak at risk (no commit today)')
  it('handles timezone boundaries correctly')
  it('counts today correctly if commit made after midnight')
  it('handles leap year Feb 29 correctly')
  it('handles months with 28, 29, 30, 31 days')
})

Implementation Details

• Find streak utility functions in src/lib/ or similar
• Create __tests__/streak.test.ts
• Pure unit tests — no DB or API mocking needed
• Test edge cases: year boundaries, timezone changes, DST

Acceptance Criteria

• All 10 test cases implemented
• 100% branch coverage for streak calculation functions
• Tests run in < 100ms (pure unit tests)
• Edge cases (timezones, leap years) covered

[kejriwalkaushal04]

Hey @Priyanshu-byte-coder , I am a GSSOC’26 contributor and already have 2 merged PRs. I’ve understood the issue clearly and would love to work on it. Kindly assign this issue to me. Thank you!

[palakjaiswal16]

Hi, I'd like to work on this issue under GSSoC 2026. Could you please assign it to me if it's available?

[github-actions]

Assigned to @palakjaiswal16! You have 7 days to open a PR. No PR after 7 days = auto-unassigned so others can pick it up. Good luck!

[Priyanshu-byte-coder]

Hi! 👋 Just checking in — are you still working on this? If you're busy or no longer interested, no worries at all! Just let us know and we'll unassign so other contributors can pick it up. Thanks!

[github-actions]

@palaksethi05 This issue is already taken by @palakjaiswal16. Check other open issues!

[deepsikha-dash]

/assign
/claim
Hi @Priyanshu-byte-coder, I'd like to work on this issue under GSSoC'26.
I’ll add comprehensive unit tests for the streak calculation utility functions, covering the proposed scenarios and edge cases such as empty histories, streak resets, leap years, timezone boundaries, and streak-at-risk conditions. I’ll ensure the tests remain pure unit tests and maintain high coverage. Please assign this issue to me. Thanks!

[github-actions]

@deepsikha-dash This issue is already taken by @palakjaiswal16. Check other open issues!