End-to-end testing

What is end-to-end testing?

End-to-end testing checks that a complete workflow works the way a real user would experience it, across the whole system. A test drives the actual interface, hits the real API, talks to the database, and confirms the result, the same chain a person would trigger. It answers a question unit tests cannot: do all these parts, wired together, actually do the job?

The contrast with unit testing is the key distinction. A unit test checks one function in isolation, fast and narrow. An end-to-end test checks the assembled system, slower but realistic. You can have a thousand passing unit tests and still ship a broken checkout if the payment service and the order database disagree about what happened. An end-to-end test for "add to cart, pay, receive confirmation" catches exactly that kind of seam between components.

Because they exercise the full stack, end-to-end tests are slower and more fragile than unit tests, so teams keep them focused on the workflows that matter most. Tools like Playwright, Cypress, and Selenium drive a real browser through these flows. The aim is a small set of tests that prove the critical paths hold up, not coverage of every possibility.

End-to-end testing at Dallonses

We cover the paths that would hurt most if they broke. Login, checkout, the core action a product exists to do. These run automatically in our test automation suites, often through Playwright, so a regression in any one of them gets caught before it reaches users rather than after.

We are deliberate about how many we write. End-to-end tests are valuable and expensive, and a suite that takes an hour and fails at random teaches a team to ignore it. We keep the set tight, fast, and trustworthy, wire it into the deployment pipeline, and fix flakiness as seriously as we fix bugs. A green run should mean the critical paths actually work.

Need the critical paths in your product to hold up under real use? Let's test them properly.

Talk to us about QA