Mobile & Cross-Platform

Real-time features — live dashboards, collaborative editing, notifications, and chat — create testing challenges that HTTP-based thinking doesn't handle well. This guide covers testing WebSocket connections, Supabase Realtime channels, Socket.io handlers, and reconnection behavior with Playwright and unit testing strategies.

Dark mode is no longer optional — 81% of smartphone users enable it. But dark mode introduces a parallel set of visual bugs: low contrast, hardcoded hex colors, invisible icons, and flickering during theme transition. This guide covers automated visual regression testing for dark mode and dynamic themes using Playwright.

Multi-factor authentication is critical for security, but it is notoriously painful to test. OTP codes that expire in 30 seconds, SMS delivery delays, and TOTP clock sync issues create a testing nightmare. Here's how to automate MFA testing without relying on real SMS delivery or manual code entry.

Resizing a browser window to 375px wide is not mobile testing. Real mobile behavior involves touch events, gesture recognition, device pixel ratios, safe area insets, and input type interactions that desktop emulation misses entirely. This guide covers thorough mobile testing with Playwright's device emulation.

Progressive Web Apps promise offline-first experiences — but most teams never actually test offline behavior until a user reports a broken screen. This guide covers how to test service worker caching strategies, offline fallbacks, and background sync with Playwright's network conditioning APIs.