Blog — Diogo Gomes | QA, automation, CI/CD and testing

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Articles on Software Quality, test automation, CI/CD, development, and readings that helped me along the way. Filter by topic below.

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Testing

Test data management: the invisible bottleneck of automation

Most flaky tests don't fail because of logic, but because of data. Fixtures, factories, isolation, and the rule that each test owns its own state.

Jun 30, 2026 Read

Automation

Visual regression testing: when the test passes but the screen is broken

The E2E run is green and yet the button vanished, the layout overflowed, or the text became invisible. How to compare screenshots, tame false positives, and fit it into the pipeline.

Jun 29, 2026 Read

QA

Accessibility testing: what automation catches and what it never will

axe finds about a third of the problems; the rest is keyboard, screen reader, and human judgment. WCAG, tools, and the layered process that combines both.

Jun 28, 2026 Read

Automation

Mobile testing with Appium: what changes when the target is an app

Automating an app is not automating a website. How Appium works, native locators, device fragmentation, and the gestures, waits, and permissions that only exist on mobile.

Jun 27, 2026 Read

Testing

Performance testing: load, stress, and the numbers that matter

Working is not the same as holding up. Load, stress, soak, and spike, plus the metrics that really matter (percentiles, throughput, and error rate) with a minimal JMeter plan.

Jun 26, 2026 Read

Testing

BDD, ATDD, and TDD: what each acronym solves

The three most confused acronyms in QA. Which level each one works at, who writes it, and how they complement each other day to day, with a mind map and examples.

Jun 25, 2026 Read

Testing

Gherkin and Given-When-Then: specification that becomes a test

The language business and automation read the same way. Syntax, Scenario Outline, step definitions, and the anti-patterns that make scenarios brittle.

Jun 24, 2026 Read

QA

Test design techniques: covering more with fewer cases

Equivalence partitioning, boundary values, decision tables, and state transitions: how to pick the right cases instead of trying to test everything.

Jun 23, 2026 Read

QA

The test pyramid and the agile testing quadrants

Where each type of test lives, the ice cream cone anti-pattern, and how the Agile Testing quadrants reveal what nobody is covering.

Jun 22, 2026 Read

Testing

Smoke, sanity, regression, and retest: the types that get mixed up

What each term really means, when to run each one in the pipeline, and why retest and regression answer different questions.

Jun 21, 2026 Read

Automation

Test doubles: mock, stub, spy, fake, and dummy

The five test doubles, with code. The difference between stub and mock, and the split that matters: verifying state vs. verifying behavior.

Jun 19, 2026 Read

QA

Exploratory testing and session-based testing

Testing by thinking, not by following a script. Charters, time-boxed sessions, and heuristics (SFDPOT, RCRCRC) that give structure to investigation.

Jun 13, 2026 Read

Automation

Playwright in practice: modern E2E testing

Why Playwright became my default for end-to-end tests: auto-wait, multi-browser, trace viewer, and fast parallel execution.

Jun 18, 2026 Read

CI/CD

CI/CD for QA: tests at the heart of the pipeline

How to integrate automated tests into the pipeline, give the team fast feedback, and use quality gates to block regressions.

Jun 10, 2026 Read

QA

Thoughts on QA: quality belongs to everyone

QA is not a phase or a department; it's a culture. Reflections on shift-left, prevention, and the role of the modern QA.

Jun 2, 2026 Read

Testing

Unit tests: the base of the pyramid

What makes a good unit test, the AAA pattern, what NOT to test, and why they are the highest-return investment in quality.

May 25, 2026 Read

API

API testing: from Postman to automation

Contracts, status codes, schema validation, and how to bring your Postman collections into the pipeline with Newman.

May 17, 2026 Read

Reading

Book summary: "Naked Statistics"

How statistics, stripped of its complexity, becomes a powerful tool for decisions in BA and QA.

Oct 27, 2025 Read

Automation

Page Object Model: an E2E suite that scales

The pattern that keeps your automation from turning into a web of duplicated selectors. Practical rules to keep the suite readable and cheap.

Jun 20, 2026 Read

CI/CD

Flaky tests: the poison in your pipeline

Where flakiness comes from and how to fight it before the team loses trust in a green CI.

Jun 12, 2026 Read

QA

The art of the bug report

The anatomy of a report that leads to a quick fix: steps, evidence, context, and the difference between severity and priority.

Jun 5, 2026 Read

Testing

TDD in practice: red, green, refactor

Writing the test before the code feels counterintuitive, and it is one of the techniques that most improves the design of what you ship.

May 28, 2026 Read

API

Contract testing between services

The confidence of integration with the speed of a unit test. How Pact guarantees the contract between consumer and provider.

May 20, 2026 Read

Reading

Clean Code in a QA's day to day

Test code is code too. The principles from Robert C. Martin's book applied to an automation suite that lasts.

May 10, 2026 Read