Michał Pierzchała - How a test runner works?

Описание к видео Michał Pierzchała - How a test runner works?

We're using test runners like Jest daily (or I do hope so!). They boost our confidence by running JS efficiently in various environments. But what's going on under the hood? How do they make it fast? How can they run only what's relevant to your changes? We'll explore the design behind Jest and how its flexibility allows running e.g. Python alongside TypeScript is a single run. Prepare for a deep dive into what makes for a high performance, well designed test runner based on Jest, which I have a few years of experience with.

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