End-to-end test
Also called E2E test
A test that drives the whole system the way a user would: a real browser, clicking real buttons, against the real app and its database.
An agent can only claim a screen works until something looks at it. An end-to-end test can be its eyes. It is also the slowest and flakiest kind, so keep a few that matter and not hundreds.
Say it to your agent
“Write one Playwright test for the checkout: sign in, add an item, pay with the test card, and check the confirmation page shows the order number. Wait on what the page shows, and use no fixed sleeps.”