Create Custom Jest Matchers to Test Like a Pro

Michael Krasnov
JavaScript in Plain English
3 min readFeb 19, 2020

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Jest is an industry-standard testing framework for JS projects. It was developed by Facebook to test their code and was made open-source. In this article, I will teach you to create custom Jest matchers to supercharge your testing skills.

What is a matcher?

A matcher (or an assertion) is a function that is used to check for a specific condition…

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