Regression Testing
Regression testing — verifying that existing functionality still works after a change — is the unglamorous backbone of software quality. It's the testing that happens every sprint, every deploy, every time someone changes a piece of code that might have touched something else. The problem: regression testing at any meaningful
Testing
Every mature test strategy uses multiple types of tests, each serving a different purpose. Smoke, regression, and acceptance testing are three of the most commonly used — and most commonly confused. They're not interchangeable. Running the wrong type of test at the wrong time wastes time at best and
Testing
A regression test suite that nobody maintains is a liability, not an asset. After six months of neglect, you'll have 30% of tests failing for no good reason, developers who've learned to ignore failures, and zero confidence in your "green" builds. This is test
Testing
"Regression testing" and "retesting" get used interchangeably in engineering conversations, but they're different activities with different goals, different triggers, and different scopes. Mixing them up leads to either missed bugs or wasted effort. Here's a clear breakdown. The Short Version Retesting: You
Testing
A regression test suite that runs once a week on a developer's laptop isn't regression testing — it's wishful thinking. Real regression testing happens automatically, on every meaningful code change, as part of your CI/CD pipeline. Here's how to set that up
Testing
Playwright has become the go-to tool for browser-based regression testing. It's fast, reliable, and supports Chromium, Firefox, and WebKit out of the box. This tutorial walks through setting up a practical regression test suite with Playwright — from project structure to CI integration. Why Playwright for Regression
Testing
Running your entire regression suite on every commit is a solved problem — it's just slow and expensive. The real challenge is figuring out which tests to run when, so you catch regressions as early as possible without waiting two hours for CI. AI-powered test selection is changing
Testing
LLM regressions are silent killers: the app still returns a response, but the quality degraded after a prompt change, model upgrade, or context window modification. Traditional regression tests that assert exact string equality fail immediately with LLMs. This guide covers behavioral regression testing, prompt versioning, LLM-as-judge evaluation, and
Testing
Every time you ship a new feature, you're rolling the dice on the code that already works. Regression testing is how you stop that gamble from costing you production incidents. This guide covers what regression testing actually is, the different types, when to run it, and how to