[Test] Add Single-Item Boundary Test Case to Task Prioritization Test Suite

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

Why This Matters

Sorting and ordering algorithms must gracefully handle single-element arrays without mutation errors or indexing issues.

Current Behavior

tests/tasks-validation.test.ts covers multi-item sorting, but lacks a dedicated single-element array boundary test.

Requested Change

Add a test case in tests/tasks-validation.test.ts verifying that prioritizing an array with 1 task returns that single task without errors.

Acceptance Criteria

• Single-item sorting test case added to tests/tasks-validation.test.ts.
• Test suite executes cleanly: npm run test:file -- tests/tasks-validation.test.ts.

Verification

npm run test:file -- tests/tasks-validation.test.ts

Contributor Notes

Single test case addition.

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Start in tests/tasks-validation.test.ts and review the existing multi-item prioritization tests to match their setup and assertions. Add a single-task boundary case that verifies the task is returned without errors or mutation, then run npm run test:file -- tests/tasks-validation.test.ts and confirm the suite passes.