[Test] Add Empty Queue Assertion to Offline Sync Queue Test Suite

• Labels: good first issue, testing, difficulty:beginner, area:core
• Target File: tests/offline-queue-sync.test.ts
• Estimated Time: 10–15 minutes
• Difficulty: Level 2 (Beginner)

Why This Matters

Offline synchronization must handle empty state queues gracefully when network connectivity is restored without issuing unnecessary network requests or throwing unhandled exceptions.

Current Behavior

tests/offline-queue-sync.test.ts tests queued item processing, but does not explicitly test calling sync on an empty queue array.

Requested Change

Add a unit test case in tests/offline-queue-sync.test.ts asserting that flushing an empty offline queue resolves to an empty result array cleanly.

Acceptance Criteria

• Empty queue test case added to tests/offline-queue-sync.test.ts.
• Test suite passes cleanly with npm run test:file -- tests/offline-queue-sync.test.ts.

Verification

npm run test:file -- tests/offline-queue-sync.test.ts

Contributor Notes

Single test case addition.

🚀 How to Claim and Implement an Issue

1. Choose an Issue: Browse our open issues and pick one matching your interest and available time.
2. Comment on GitHub: Leave a comment on the corresponding GitHub issue: "I would like to work on this issue. Please assign it to me."
3. Follow the Guide: Review our Beginner's Contribution Guide for step-by-step Git instructions.
4. Verify Locally: Run the specific verification command listed on the issue before opening your PR.
5. Submit PR: Open a pull request against main referencing this issue number!

Open tests/offline-queue-sync.test.ts and review the existing queued-item tests to follow their structure. Add the empty-queue case and run npm run test:file -- tests/offline-queue-sync.test.ts; done means the test passes and verifies an empty result array.