Add comprehensive edge case and error state testing

[Copilot]

Implemented missing QA test coverage for edge cases: empty/null inputs, permission boundaries, network failures, and mobile interactions.

Test Infrastructure

Backend (Jest): 45 tests, ~1s runtime

• Model validation suite for empty/null/whitespace inputs
• Permission boundary tests for role hierarchy (admin > member > viewer)
• Access control validation for boards, tickets, comments

Frontend (Vitest + React Testing Library): 49 tests, ~12s runtime

• Form input validation (BoardModal, TicketModal)
• Network retry logic with 2-attempt backoff
• Mobile edge cases (touch events, orientation, keyboard, offline/online)

Test Coverage

Empty/Null Inputs (36 tests)

• Board/Ticket/User models enforce required fields
• Whitespace-only inputs rejected
• Length constraints validated (title: 100 chars, description: 1000 chars)
• Optional fields default correctly

Permission Boundaries (21 tests)

• Role hierarchy enforced: admin (3) > member (2) > viewer (1)
• Board access: admins see all, members see theirs + shared
• Modification rights: only admins + owners can delete
• Edge cases: null owners, undefined members handled gracefully

Network Resilience (17 tests)

• Retry mechanism: 2 attempts with 1s delay
• 401 errors trigger logout without retry
• Network errors show toast notifications
• All HTTP methods (GET/POST/PATCH/DELETE) covered

Mobile Edge Cases (20 tests)

• Touch events and gesture handling
• Viewport adaptation (portrait/landscape, 320px-375px widths)
• Virtual keyboard interactions
• Memory leak prevention on rapid open/close

Notable Finding

BoardModal validates title.trim() but passes untrimmed value to parent. TicketModal trims correctly. Consider standardizing.

// BoardModal (current)
if (!title.trim()) return;
onCreate(title); // passes untrimmed

// TicketModal (correct)
onCreate({ title: title.trim(), ... });

Run Tests

cd backend && npm test  # 45 tests
cd frontend && npm test # 49 tests

Documentation: /docs/testing/EDGE_CASE_TESTING.md

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fastdl.mongodb.org
  • Triggering command: /usr/local/bin/node node ./postinstall.js (dns block)
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Tasky/Tasky/backend/node_modules/.bin/jest --runInBand (dns block)
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Tasky/Tasky/backend/node_modules/.bin/jest --runInBand basic.test.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>(QA) Edge Case & Error State Testing</issue_title>
<issue_description>Test empty/null inputs (titles, descriptions)
Test permission boundaries (members trying admin actions)
Test network failures and recovery
Test mobile-specific edge cases (touch, orientation changes)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes (QA) Edge Case & Error State Testing #79

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