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Testing
To preserve code quality over time, you may want to add testing to your Gatsby site. Several of the more popular testing use-cases with Gatsby are JavaScript unit tests (Jest), React component tests (react-testing-library), and end-to-end tests (Cypress).
Main Guides 3
Jest→
Unit testing protects against unexpected behavior in your code. Walk through a few extra steps you'll need to set up Jest, a popular Javascript testing framework, with Gatsby.
React components→
Install and use react-testing-library, the most popular framework for testing the behavior of React components.
E2E tests with Cypress→
Automated checks of specific user flows through one or many pages.