Every bug is different: Some are lurking around for months, others appear suddenly after the upgrade of a dependency. Some are introduced us, others other teams or systems. Some are painfully obvious and affect all users, others only occur in edge (cases). And the ways of finding, and eventually, preventing them, are just as diverse: be it snapshot, unit, integration, end to end tests or automated visual tests, every kind comes with its challenges and opportunities. Testing UIs is hard, but in the end, only test automation can give us the confidence we need to move fast and refactor our code relentlessly. In this talk we are going to look at what kinds of bugs there are, which tests are most effective for catching which, and how we can implement them using modern front end technologies.
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