How to write negative and edge-case test cases (50 examples)
Four test-design techniques, a worked user-story example and 50 concrete negative and edge cases grouped by category. Read the guide →
Mock API responses in Chrome without a proxy: 4 methods compared
DevTools Local Overrides, a mocking extension, Mock Service Worker and patching fetch — when to use each, with a comparison table. Read the guide →
Core Web Vitals debugging checklist for QA engineers
How to reproduce and report LCP, CLS and INP problems: thresholds, lab vs field data, and a checklist per metric. Read the guide →
System prompt testing: how to build LLM-as-judge rubrics
Designing test cases for a system prompt, writing pass/fail rubrics, calibrating the judge and catching regressions. Read the guide →