Issue: Assignment Completion - All Tasks Done

[Sankalp13353]

Assignment Completion - All Tasks Done

Overview

This issue tracks completion of the Take-Home Assignment: "The Untested API"

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✅ Day 1 - Tests & Coverage

• Unit Tests (taskService.test.js) - 11 tests covering all service functions
• Integration Tests (tasks.routes.test.js) - 6 tests covering all API endpoints with edge cases
• Coverage Target - Achieved 91.07% (target was 80%+)
  • Statement: 91.07%
  • Branch: 77.14%
  • Functions: 93.54%

✅ Day 2 - Part A: Bug Report

• Bug Identified & Documented in BUG_REPORT.md
  • Pagination off-by-one error in getPaginated()
  • Issue: Page calculations were 0-based instead of 1-based
  • Impact: page=1 returned wrong data slice
  • Discovery: Caught by automated unit tests

✅ Day 2 - Part B: Bug Fix

• Pagination Bug Fixed in src/services/taskService.js
  • Changed: offset = (page - 1) * limit (1-based pagination)
  • Added safe defaults for page/limit normalization
  • All tests passing
  • Verified with unit tests

✅ Day 2 - Part C: New Feature

• PATCH /tasks/:id/assign endpoint implemented in src/routes/tasks.js
  • Accepts assignee string in request body
  • Validates non-empty assignee (returns 400 for empty)
  • Returns 404 if task not found
  • Returns 409 if already assigned (prevents reassignment)
  • Returns updated task object on success
  • Full integration test coverage included