So why write unit tests and integration tests? They’re great ensure that a function, class method, or even a React component, does what they’re supposed to do. It helps detect errors in the code and also helps preserve integrity when changes are later introduced in the code by verifying it’s still working as intended after the update.
WordPress plugins and themes are mostly written in PHP and can use PHPUnit suite for running tests, making assertions, mocking functions and more. The handbook even has a section explaining how to quickly setup unit testing with the WP-CLI.
toHaveLengthand many more
In order to keep this article focused on testing with Jest, there’s additional setup external to the process of testing like Babel or Webpack that won’t be covered here. All this can be found in the WP Jest Tests repo that accompanies this article. To keep things contextual, each section will link to one of the relevant files that we’ll write.
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I decided to spend today learning the ins and out of using Jest and creating test cases so that I may add unit tests to my projects.
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