Speaker Deck

Jest can do whaaat?

by Robin Pokorny

Published November 1, 2017 in Technology

Jest is React’s best testing companion. It also brought several concepts to mainstream JavaScript testing: zero configuration, first-class mocking, and snapshots. With the rapid release of speed improvements, it’s easy to miss a new useful feature. I will present some lesser-known possibilities of recent Jest versions I’ve learned during experimenting, reading (and writing) the docs, and browsing the code.

Code: https://github.com/robinpokorny/jest-can-do-whaaat

Presented at React Open Source: https://www.meetup.com/preview/React-Open-Source/events/244027983

Resources:
- Example code: https://github.com/robinpokorny/jest-can-do-whaaat
- Jest Snapshots and Beyond (https://youtu.be/HAuXJVI_bUs) by Rogelio Guzman (recording)
- Writing snapshot plugins (https://github.com/facebook/jest/tree/master/packages/pretty-format#writing-plugins) in the docs
- Effective Snapshot Testing (https://blog.kentcdodds.com/effective-snapshot-testing-e0d1a2c28eca) by Kent C. Dodds
- Async testing in Jest (https://www.youtube.com/watch?v=bw10S2BK-5w) (recording)
- Snapshot testing in Jest (https://www.youtube.com/watch?v=yUlfFMhVfZo) (recording)
- Async testing Koa with Jest (https://hackernoon.com/async-testing-koa-with-jest-1b6e84521b71)

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