David Mello

Flume water monitor battery replacement, step by step with video: remove the sensor, swap the battery pack, reseal it, and recalibrate in the Flume app.

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

Build a floating ghost hologram for your yard with tulle, scrap wood, and a projector.

Playwright tests that change global state break parallel test runs.

A framework for running fewer tests without missing real bugs, and the one prerequisite that has to be true first.

Reuse existing Playwright functional tests for load testing instead of building a parallel suite.

An AI-generated performance test missed a real bug, and the app broke in production.

I replaced my Poolvergnuegen suction-side cleaner with the Aiper Experts Duo robotic pool cleaner (Scuba V3 + EcoSurfer S2).

Replacing a seized gable attic fan: why intake venting matters most, CentricAir vs QuietCool, and three years of real attic temperature and humidity data.

A StarEast tutorial put names to prompt engineering techniques I was already using and filled in gaps with a practical prompt template for test engineers.

Ubiquiti's new 5G backup hardware is genuinely good.

Portable AC efficiency fixes ranked by cost and effort: duct insulation, the intake hose most people skip, window sealing, and when to upgrade to a mini-split.

Playwright's MCP server can burn your AI budget fast.

StarEast 2026 trip report: what a hands-on AI testing tutorial taught me about prompt engineering, evals, and building an AI chatbot as Count Dracula.

Brittle selectors slowing your team down?

A 6-year hands-on Ecobee 3 review from a Florida homeowner — occupancy detection, remote sensors, humidity control, and whether the cost is worth it after years of real use.

Testing an AI chatbot with Promptfoo and Playwright: oracle problem, guardrail testing, bias detection, and accessibility — lessons from a real two-week engagement.

Most QA engineers answer this interview question confidently wrong.

At $9.99/mo, UniFi Talk replaced my ISP VoIP service, cut my bill by $20/mo, and eliminated robocalls entirely.

When a test fails due to a known bug that can't be fixed immediately, commenting it out is the wrong move.

Schemathesis automates API testing by generating test cases directly from your OpenAPI spec — covering edge cases, schema violations, and server errors you'd never think of or have the time to write manually.

axe and Lighthouse miss 60–70% of WCAG violations.

Added a $138 EPS foam insulation kit to my Florida garage door and tested it with a FLIR thermal camera.

Not every AI testing complaint is a real tool limitation.

Step-by-step DIY solar ground mount installation using the IntegraRack IR-15 and AnchorSpike system — no concrete pad required.

Airspool solar mini-split review from a South Florida garage install.

After interviewing and evaluating over a hundred QA engineers, testers, and quality assurance professionals, here's what ISTQB certification actually signals — and what it doesn't.

Looking for example demo sites to practice your test automation against with Selenium, Playwright, or Cypress?

BrowserStack's State of AI Testing 2026 report shows 93% of companies using AI in testing workflows.

Learn how to extend Nightwatch's built-in automation commands with your own when working inside a TypeScript Nightwatch test project in this post.

Learn how to add API testing to your existing selenium automated tests using the API testing plugin for Nightwatch.js Continue reading →

Decision tables are software testing tools used to ensure one fully captures the expected behaviors of features involving complex business rules.

This handy guide will show you how to perform email testing in your end-to-end test automation to verify email delivery, recipient, localized content, or follow links out of account verification/activation emails in your Nightwatch selenium test suite usi…

Visual regression testing is a QA testing technique effective at catching look and feel or layout regression defects and catching bugs that you aren't explicitly looking for in your tests.

Nightwatch supports TypeScript!

Ubiquiti released their new Wi-Fi 6 access points including their new U6-Pro-US so I decided to upgrade and test the speeds to see how the Unifi Wi-Fi 6 Pro compares to the UAP-AC-Pro and UAP-AC-HD using an iPhone 13 pro and iPerf3.

In this review I'll use SwitchBot door contact and motion sensors to setup smart home automation routines using Amazon Alexa and the SwitchBot app to turn on lights when I open the door or shut lights off when occupancy isn't detected in the room.

There are a lot Tesla Model Y accessory options out there.

I've been researching battery-powered power stations or generators as hurricane-season approaches and this review goes over the features of the Oupes 600w, 595wh, inverter power versus similar models from Jackery and GoalZero.

The Flume 2 provides wifi whole-house water monitoring without requiring cutting plumbing or external power allowing you to see check water usage and get notified of leaks in near real time.

How to calculate total dynamic head (TDH) to find your variable speed pool pump's optimal GPM and RPM settings — no flow meter required.

Amcrest has been releasing 1080p and now 4k webcams at budget-friendly prices throughout 2020 and 2021.

Test case management systems that aren't integrated with your automation framework are wasteful.

Learn how to use Nightwatch.js global variables so you don't need to hardcode values in your test automation allowing them to work in multiple environments and reduce test maintenance costs.

This tutorial will cover how to implement a minimum accessibility test plan against a website using Nightwatch.js and aXe.

TP-Link released a unicorn of a smart bulb for those looking for a smart LED edison filament style bulb perfect for people who like vintage bulbs, but don't want to sacrifice energy savings and home automation features.

Learn how to configure Nightwatch.js to use SauceLabs for scalable, parallelized, multi-browser automated test execution in this software testing tutorial.

Renters who can't replace their switches or homeowners without neutral wires needed for smart switches have trouble installing smart switches in their homes.

Amcrest generally puts out pretty decent quality security cameras at a reasonable price, but their webcams have been hit or miss.

Our local South Florida Test Automation chapter met virtually to go over the Nightwatch.js framework.