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Regression Testing, by its definition, is a type of software testing to confirm that a recent program or code change has not adversely affected existing features.
It is done to make sure that the existing application is intact with the newly added features and nothing is broken. In order to achieve that, the existing test cases are executed selectively or sometimes completely. Regression testing ensures that the old code still works once the new code changes are done.
Every online business owner has woken up in cold sweat from this nightmare at least once in their life: you see your perfect customer, they are in their office, it’s after-lunch hours, and they are entering your website ready to spend a few hundred dollars. But… your website isn’t loading. They get a 503 error, close the tab, and flash-forward 3 minutes later, they purchase from your competitor and forget about your existence.
What could have saved you from losing a client? “Web performance monitoring!” – we say.