Mastering Jest: A Complete Guide to Testing/

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The Jest Extended Library

The Jest Extended Library

Learn about jest-extended, an open-source library that easily extends our testing toolkit.

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Expanding our testing toolkit

In addition to the variety of matchers provided to us directly from Jest, there are a number of libraries that extend its functionality with additional matchers. One of the most common is the jest-extended jest-extended library, created and maintained by the Jest community. It includes TypeScript support and extends functionality for asserting upon the following:

  • Arrays
  • Booleans
  • Dates
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