Jest Review

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Review of Jest powered by the Slant community.

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Pros

Pro
Easy to use

One of Jest's philosophies is to provide an integrated “zero-configuration” experience.
Eg: it provides assertion library by default.

Pro
Well documented

Pro
Recommended for React testing

Jest is the recommended unit testing framework by Facebook. It's also the one used by Facebook developers when working with React projects.

Pro
Snapshot testing is convinient

It's great for testing UI.
It is also convenient for asserting complex data objects, as it doesn't require developers to manually compose the expected value.

Cons

Con
Not beginner-friendly

If you're new to unit testing and are trying to understand unit testing within the React ecosystem, specifically ReactNative, it is going to be a challenge. The Jest doc dives right into making tests without any primer on how to go from concept to implementation.