Articles on Quality engineering

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How to Make Your SKILL.md Interactive

How I added interactive questions to a skill so it works in Claude Code, Cursor, and Codex, and what still breaks across harnesses.

September 1st, 2026→

679 min

Maslow's Hammer and Three Lies QA Tells Itself

A short post on what needs to change for QA to thrive in the age of AI.

March 31st, 2026→

664 min

AGENTS.md Files Are Not Misleading Your AI Agent

A recent study sparked headlines claiming AGENTS.md files hurt AI agent performance. But the full picture tells a different story - human-written context files actually improve results by 4%.

March 2nd, 2026→

655 min

Don’t let A.I. read your .env files

Stop storing API keys and database passwords in plain text .env files. Learn how to use 1Password CLI to inject secrets at runtime for better security.

December 11th, 2025→

645 min

How I automated the annoying part of my job with Goose and Playwright MCP

Learn how to automate repetitive issue creation tasks using Goose desktop app and Playwright MCP. Stop context switching and let AI handle the boring stuff.

November 27th, 2025→

637 min

10 Tips for Writing Playwright Tests with Cursor

Practical tips gathered from months of writing Playwright tests with Cursor. Learn how to use project rules, workflows, screenshots, and MCP for better test automation.

October 13rd, 2025→

628 min

2FA testing with Playwright and Mailosaur

Learn how to automate email magic links, SMS verification codes, and authenticator app logins in Playwright using Mailosaur for comprehensive authentication testing.

October 3rd, 2025→

614 min

Testing Will Become More Important, Not Less

LLMs speed up coding but quality concerns remain. Testing becomes more crucial, evolving to include AI-generated tests while human expertise in test design stays valuable.

April 16th, 2025→

603 min

Understanding timeouts in WebdriverIO

Learn how to effectively use timeouts in WebdriverIO to create reliable end-to-end tests

February 19th, 2025→

599 min

Introduction to testing in Vitest

A comprehensive guide to Vitest testing framework, covering its core features, capabilities and practical examples for unit and component testing

December 19th, 2024→

586 min

How to do authentication in Playwright

Learn different approaches to handle authentication in Playwright, from basic login sequences to advanced techniques like session storage and API auth.

December 10th, 2024→

576 min

Test like a developer, develop like a tester

How testers and developers can work better together. This is a written version of my keynote talk from Front-End Test Fest 2023.

November 27th, 2024→

565 min

Laid off as a tester. What now?

Navigating the changing QA job market: tips for staying relevant, expanding your skillset, and preparing for potential layoffs in software testing

November 16th, 2024→

556 min

Testing as an entry gate to IT

Some people don’t like the phrase “testing can be a great entry gate into the world of IT”. I kinda disagree, I think testing can be a great entry into the world of IT. This post discusses some reasons why I think that.

January 12th, 2024→

544 min

Next big trend in testing? Debugging

Debugging has been with us and will be for a long time. Making improvements on that experience might just be the next big thing.

August 14th, 2023→

536 min

Time-travelling with Replay.io

Replay.io is a tool that records everything your app does and provides you with debugging superpowers. The recording is a combination of video, source code of your application, DOM snapshots and a timetravel-enabled devtools that allow you to retroactively add print statements to your app’s execution.

July 31st, 2023→

524 min

Cypress panic (if there even is one)

A reddit post was making rounds on the internet claiming that Cypress.io is dying and you should migrate your projects. I believe this post got way more attention than it deserved. In fact, I believe it deserved no attention whatsoever because by amplifying it, the lies that it contained spread far and wide.

July 25th, 2023→

514 min

Cypress basics: Using baseUrl

Setting up `baseUrl` helps you write your test in a way that enables running them against multiple environments. This is vital to make your tests available for multiple versions of your app.

April 5th, 2023→

5013 min

Cucumber in Cypress: A step by step guide

A detailed guide on how to set up cucumber-preprocessor, run your feature files, organize your tests, filter them by tags and set up an HTML reporter.

March 21st, 2023→

495 min

How to wait for page to load in Cypress

What if your page takes time to load and your first command fails because of this? In this blogpost I explain how to make sure that your page is fully loaded

March 15th, 2023→

4823 min

How to structure a big project in Cypress

Opinion on how a project with +2000 tests should be structured in order to achieve good maintainability, speed and lower the risk of introducing regressions.

February 1st, 2023→

477 min

Cypress.io and GitHub Actions: A step by step guide

GitHub Actions are a powerful and easy-to-learn tool that can help you quite a lot, In this blogpost we'll take a look into how they can be used to run your Cypress tests.

January 16th, 2023→

469 min

Use cy.session() instead of login page object in Cypress

Short guide to using cy.session() command an save minutes from your test run. Creating a session with Cypress can not only save you time, but can be a great substitution for a log page object

November 16th, 2022→

455 min

Testing a PDF file with Cypress

How to download a PDF file, check the download and parse out the content of the file for further testing

August 8th, 2022→

445 min

Testing geolocation with Cypress

Explanation on how to test a page that can locate its users either via API call or using browser’s Geolocation API capabilities

August 2nd, 2022→

435 min

Cypress basics: Uploading a file

Short explanation on how to upload a file with Cypress to a drag and drop element, inputs or directly by calling your API

July 27th, 2022→

4210 min

8 common mistakes in Cypress (and how to avoid them)

In this blogpost I’m sharing a couple of testing antipatterns that can make your test flaky, hard to read or slow.

July 14th, 2022→

415 min

Testing frontend performance with Cypress

How to measure loading of elements appearing on page using browser performance API and creating a custom command out of it.

May 9th, 2022→

406 min

Writing better command chains in Cypress

Understanding how command chaining in Cypress works is essential for writing stable tests. In this week’s explainer we’ll take a look on how we can make our tests more stable with writing proper command chains

February 15th, 2022→

399 min

Google Sign in with Cypress

Explanation on how to log in to Google SSO enabled app programmatically and how does the process actually work.

February 7th, 2022→

384 min

Switch between environments in Cypress

There are multiple ways you can switch to different environments in Cypress. In this blogpost, I explain which ones you can use and show some examples.

January 24th, 2022→

375 min

Cypress basics: API testing

Cypress is a great testing tool that can be also very helpful when testing API. In this post, I’ll go over some basics on how to write an API test in Cypress.

January 17th, 2022→

366 min

Waiting in Cypress and how to avoid it

Adding a wait to your test is something people like to avoid. Luckily, with Cypress, there are several ways of how to avoid waiting for a static period of time and simply move a test forward once the application is in a state we desire.

January 10th, 2022→

357 min

Cypress basics: Variables

How to store variables in Cypress tests and use variables and aliases inside the test and between tests.

December 7th, 2021→

343 min

Cypress basics: xpath vs. CSS selectors

Using xpath with Cypress is possible through a plugin. In this post I show you how to install this plugin and show you some examples how to use xpath and compare it to Cypress commands.

November 22nd, 2021→

334 min

Autocompleting selectors in Cypress with TypeScript

Using TypeScript, we can make our lives with custom selectors easier. Our editor can autocomplete our selectors and check if we aren’t using any that were already deleted

November 15th, 2021→

324 min

Generating a random user in Cypress test

Quick guide on how to generate a random user in Cypress and an explanation of various ways on how to integrate that data into Cypress test.

May 24th, 2021→

314 min

Testing links with Cypress

Let’s say you want to test all the links in a navigation bar, ideally in most effective way. In this article I show you some of the most effective ways

April 26th, 2021→

306 min

Reading and testing JSON object in Cypress

Ever got that frustrating Cannot read property 'x' of undefined error? If you are starting with JSON objects, it is easy to get lost. In this article I hope to shed some light into how to read and test them with Cypress

April 19th, 2021→

293 min

Cypress basics: Check attributes, value and text

Short explanation of how to test and access different properties of a given element using .invok() function

April 12th, 2021→

283 min

.contains() - an overlooked gem in Cypress

Although the name of this command sounds like an assertion, it is actually a selecting command. Let’s look into what makes this command great.

April 5th, 2021→

277 min

Improve your custom command logs in Cypress

Short explanation on how to take your custom commands to another level with custom logging, snapshots and many more.

March 16th, 2021→

265 min

Tips for debugging tests in Cypress

If you’ve been testing for a longer time, you know that writing a test is only half of the story. The other half is maintenance. I share a couple of ways you can debug your tests in Cypress in my latest article.

March 8th, 2021→

254 min

Make your Cypress tests faster with .clock()

With .clock() and .tick() functions, it is possible to manipulate app’s time and make your test faster by skipping waits of setTimeout() and setInterval() functions.

March 1st, 2021→

248 min

Starting with TypeScript in Cypress

TypeScript has been gaining popularity over last couple of years, and for good reason. Learn how you can implement TypeScript features in your tests.

February 22nd, 2021→

235 min

Cypress basics: before(), beforeEach(), after() and afterEach()

Mocha hooks can help you tremendously when trying to avoid repetition in your tests. This article explains how these hooks work and how to use them effectively.

February 15th, 2021→

225 min

Skip test conditionally with Cypress

Description of various ways of how you can filter your tests, run them based on a given condition or skip them altogether in Cypress.

February 8th, 2021→

214 min

Cypress basics: check if element exists

In this article we are exploring ways to assert visibility of an element on a page. There are couple of gotchas that may be confusing at times.

February 1st, 2021→

202 min

Dealing with multiple redirects in Cypress

There are cases where you might deal app quickly redirecting through multiple pages. Chances are that Cypress will not register the page in the middle of redirect chain. In this post I will show you ways you can deal with this.

January 25th, 2021→

199 min

Understanding code coverage in Cypress

It’s pretty awesome that you can use e2e tests to generate your coverage data. In this blog I’m describing how the whole process works.

January 18th, 2021→

184 min

Hover in Cypress

Short guide on how to hover over elements in Cypress. As there are multiple ways hover actions work, there are multiple ways of achieving hover.

January 11th, 2021→

174 min

Migrating .route() to .intercept() in Cypress

With version 6.0.0 of Cypress.io, the network layer was completely rewritten. This post will guide you through the process of migration to the new experience.

December 7th, 2020→

169 min

Working with API response data in Cypress

In this post, I’m showcasing different ways to handle data generated by server and use them in your tests.

November 30th, 2020→

155 min

Create a configuration plugin in Cypress

There are several different ways to configure how your Cypress tests can be configured. In this post, I’m describing these ways and explain how you can view them in Cypress GUI.

November 23rd, 2020→

145 min

Test grepping in Cypress using Module API

Sometimes you want to run just a subset of your tests. With Module API, you can achieve just that. Showcasing how you can grep your tests by folder.

November 9th, 2020→

134 min

Using destructuring in Cypress

Short explanation on how to do destructuring in JavaScript and how you can use it to simplify your Cypress tests.

November 2nd, 2020→

124 min

Cypress basics: Where did my cookies disappear?

Cypress clears the browser state before each of your tests. This means that sometimes you might need to think about how you need to handle cookies.

October 27th, 2020→

116 min

Testing a websocket application with Cypress

Learn how to test websocket-enabled applications using Cypress.io, including handling real-time updates and verifying socket messages.

October 19th, 2020→

104 min

Opening a new tab in Cypress

Spoiler alert: you don’t. But there are tons of things you can do to test your link redirects properly.

October 8th, 2020→

097 min

Cypress basics: Selecting elements

Cypress is using query selectors to find elements on your page. But there are couple of really powerful ways to select elements on page using Cypress commands

October 5th, 2020→

085 min

Playing with experimental network stubbing feature in Cypress

A short exploration of the capabilities of new .route2() command that was released with Cypress version 5.1.0.

September 28th, 2020→

073 min

Lesser known Cypress.io tricks

I often come across undocumented or not so widely used features that you might find helpful. Here’s a list of couple of those.

September 21st, 2020→

062 min

My favourite VS Code extensions for writing tests in Cypress

VS Code provides a variety of cool exenstions. Here are some of those that have proven to be useful for my workflow when writin tests in Cypress.

September 11th, 2020→

054 min

Testing lists of items

Short description of various ways of testing list of items using Cypress, utilizing Cypress’ retryability.

April 6th, 2020→

043 min

Improve your error screenshots in Cypress

Explanation of how you can use cy.log() command to make your screenshots more readable and your debugging experience even faster.

March 9th, 2020→

034 min

I did a Cypress workshop and this is what I learned

Describing how I conducted my first live workshop on Cypress.io on a conference in Brno and sharing my personal recommendations.

October 29th, 2019→

023 min

Testing email flows with Mailosaur

A short giude on how to test e2e flows that require an email to be opened. Code demonstration using Mailosaur.

September 13rd, 2019→

0110 min

What psychology taught me about QA

Some of my psychology background has translated to my tech career. I hope to provide some principles which I hope to be valuable to you as well.

March 26th, 2019→