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Contents Problem You want to write maintainable tests for your React components. As part of that goal, you want your tests to stay away from the implementation details of your components and instead focus on ensuring that your tests give you the assurance they are intended to provide. As part of this, you want your test base to be maintainable over the long term, so refactoring your components (changes in implementation, not functionality) doesnt break your tests and slow you and your team down. The React Testing Library solution is a very lightweight solution for testing React components. It provides lightweight functionality compared to react-dom and react-domtest-utils that supports better testing practices. His main guiding principle is that the more your tests resemble using your software, the more confidence they can give you. Installation This module is distributed via npm, which is bundled with node and must be installed as one of your projects devDependencies: npm install --save-dev @testing-libraryreact or install with thread add --dev @testing-library react This library has lists of peerDependencies for react and react. You may also be interested in installing @testing-libraryjest-dom to use your own joke matchers. Documents Suppress unnecessary warnings in React DOM 16.8 There is a known compatibility issue with React DOM 16.8 that causes you to see the following warning: Warning: The component name update in the test was not wrapped in an action (...). If you cant upgrade to React DOM 16.9, you can suppress the warning by adding the following snippet to your test configuration (learn more): This is just a small hack to fix the warning were getting for Silence Upgrade to 16.9. See also: const originalError = console.error beforeAll(() => console.error = (...args) => if (Warning.*not included in act.test(args0))) return originalError.call(console, ...args) ) afterAll(() => console.error = originalError ) Examples Simple example hidden-message.js import * as React from react A NOTICE. The React test library works well with React hooks and classes. Your tests are the same no matter how you write your components. function HiddenMessage(children) const showMessage, setShowMessage = React.useState(false) return ( <div> <label htmlFor=toggle>Show message<label> <input id=toggle type= checkbox onChange=e => setShowMessage(e.target.checked) selected=showMessage > showMessage ? Children: null <div> ) Export HiddenMessage by default __tests__hidden-message.js These imports are what you usually set up to have Jest automatically import for you. See the setup documentation for more information: screen from @testing-libraryreact import HiddenMessage from ..hidden-messageContent Problem You want to write maintainable tests for your React components. To achieve this goal, youll want to keep your tests out of the implementation details of your components and instead focus on making sure your tests provide the assurance they need to provide. As part of this, you want your test base to be maintainable in the long term, so that component refactoring (changes in implementation, not functionality) doesnt break your tests and slow you and your team down. The React Testing Library solution is a very lightweight solution for testing React components. It provides lightweight functionality over react-dom and react-domtest-utils in a way that supports better testing practices. His main guiding principle is: the more your tests resemble how your software is used, the more confidence they can provide. Installation This module is distributed via npm, which is bundled with node and must be installed as one of your projects dev tasks: npm install --save-dev @testing-libraryreact or install with yarn add --dev @testing-library react This library lists peerDependencies for react and react. You may also be interested in installing @testing-libraryjest-dom to use your joke matchers. Docs Suppressing Unnecessary Warnings in React DOM 16.8 There is a known compatibility issue with React DOM 16.8 that will cause you to see the following warning: Warning: ComponentName update was not included in the action (...) in the test. If you cant upgrade to React DOM 16.9, you can turn off the warning by adding the following snippet to your test configuration (more info): this is just a little hack to silence the warning well get until we upgrade to 16.9. See also: const originalError = console.error beforeAll(() => console.error = (...args) => if (Warning.*notwrapped in act.test(args0)) return originalError.call(console, ...args) ) afterAll(() => console.error = originalError ) Examples Basic example hidden-message.js imports * as React from react NOTE. The React testing library works well with React hooks and classes. Your tests will be the same no matter how you write the components. function HiddenMessage(children) const showMessage, setShowMessage = React.useState(false) return ( <div> <label htmlFor=toggle>Show Message<label> <input id=toggle type= checkbox onChange=e => setShowMessage(e.target.checked) checked=showMessage > showMessage ? Children: null <div> ) export HiddenMessage by default __tests__hidden-message.js these imports are the ones youd normally set Jest to automatically import for you. See the setup documentation for more information: screen from @testing-libraryreact import HiddenMessage from ..hidden-message
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