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David Mello

Breaker of software, geek, meme enthusiast.

I blog about quality assurance and software testing, home automation, technology reviews, and home improvement.

Latest Articles

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How to Make a Halloween Hologram With a Projector and Tulle
Diy Home Upgrades

How to Make a Halloween Hologram With a Projector and Tulle

Build a floating ghost hologram for your yard with tulle, scrap wood, and a projector. Real night tests show how bright your projector needs to be, plus 3D pumpkins.
How to Disable, Exclude & Phase In axe Rules in Playwright
Playwright

How to Disable, Exclude & Phase In axe Rules in Playwright

How to gradually phase in Playwright accessibility testing on existing websites with known violations, using axe rules, exclusions, and real results.
Run Parallel and Serial Tests Together in Playwright
Playwright

Run Parallel and Serial Tests Together in Playwright

Playwright tests that change global state break parallel test runs. Learn different ways to run serial and parallel tests together without failures.
Test Selection: Run Fewer Tests, Catch the Same Bugs
Test Automation

Test Selection: Run Fewer Tests, Catch the Same Bugs

A framework for running fewer tests without missing real bugs, and the one prerequisite that has to be true first. StarEast 2026 lessons.
Reuse Your Playwright Tests for Load Testing
Test Automation

Reuse Your Playwright Tests for Load Testing

Reuse existing Playwright functional tests for load testing instead of building a parallel suite. My own experience, validated by a StarEast 2026 talk.
AI Performance Testing Guardrails Every Tester Needs
Test Automation

AI Performance Testing Guardrails Every Tester Needs

An AI-generated performance test missed a real bug, and the app broke in production. StarEast 2026 lessons on the guardrails that would have caught it.