test: add integration tests for /api/goals/sync endpoint

[Subhra-Nandi]

Summary

Closes #947

Adds integration tests for the /api/goals/sync endpoint. The sync endpoint touches GitHub Search API, Supabase, and NextAuth — these tests verify the full flow end-to-end with mocked dependencies.

Changes

File	Description
test/goals-sync.test.ts	New — 25 integration tests for POST /api/goals/sync

Acceptance Criteria

• Returns 401 when no session
• Fetches commit count from GitHub Search API using correct date range
• Updates all commit-based goals with the fetched count
• Handles GitHub API 429 — returns 429, does not update goals
• Handles Supabase update failure gracefully

Test Results

All 25 tests passing:

• authentication (4)
• user lookup (1)
• when no goals exist (1)
• commit goal syncing (5)
• PR goal syncing (2)
• GitHub API rate limiting (4)
• GitHub API non-rate-limit errors (1)
• Supabase failure handling (3)
• date range correctness (2)
• commit pagination (1)
• mixed commit and PR goals (1)

Screenshots

Testing

npx vitest run test/goals-sync.test.ts

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[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

[github-actions]

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