Continuous testing means verifying and improving software quality at all stages, including development. It can sound like something only large companies do, but it’s an approach I use even for this personal blog that you’re reading this on.
Every new blog post or change I make to this site automatically triggers the execution of a small test. This test, when run over time, lets me see whether changes I’ve made have been detrimental to site performance. Here’s a video on my setup: