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<div id="app" data-page="{"component":"web/courses/lessons/theory_unit","props":{"errors":{},"locale":"ru","language":"ru","httpsHost":"https://ru.hexlet.io","host":"ru.hexlet.io","colorScheme":"light","auth":{"user":{"id":null,"last_viewed_notification_id":null,"email":null,"state":null,"first_name":"","last_name":"","created_at":"2026-02-26T16:56:42.101Z","current_program":null,"current_team":null,"full_name":"","guest":true,"can_use_paid_features":false,"is_hexlet_employee":false,"sanitized_phone_number":"","can_subscribe":true,"can_renew_education":false}},"cloudflareTurnstileSiteKey":"0x4AAAAAAA15KmeFXzd2H0Xo","vkIdClientId":"51586979","yandexIdClientId":"88d071f1d3384eb4bd1deb37910235c7","formAuthToken":"BD3x7gmd8HJ7QjOVMF3ROyhkqqanWl3HRPISU7WstyTr7DrZ--NdEs0BFw08UiFM6G2HDK9to2X5EogH56tQSg","topics":[{"id":92562,"title":"а так и должно быть? апи не работает 404 ошибка при вводе в инпут ","plain_title":"а так и должно быть? апи не работает 404 ошибка при вводе в инпут ","creator":{"public_name":"Ольга Краснова","id":236773,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":182333,"body":"**Ольга Краснова**, спасибо, что обратили внимание! Я поправил, теперь должно работать. Только вам еще нужно сделать сброс упражнения. Сохраните свое решение перед этим, если не хотите потерять его.","topic_id":92562}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Testing Library React","entity_url":null,"active":true}},{"id":68241,"title":"Тесты проходят, хотя по идее должны падать на втором поиске\nhttps://ru.hexlet.io/code_reviews/604328","plain_title":"Тесты проходят, хотя по идее должны падать на втором поиске https://ru.hexlet.io/code_reviews/604328 ","creator":{"public_name":"Grigoriy Stroganov","id":456305,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":143077,"body":"**Grigoriy Stroganov**, хм, а почему должны падать? При втором поиске вводится символ `f`. При этом уже введён символ `a`, то есть в `term` отправляется значение `af` что и ожидается тестами.","topic_id":68241}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Testing Library React","entity_url":null,"active":true}},{"id":80596,"title":"не удается подключиться ` connect ECONNREFUSED 127.0.0.1:80` \n\n```\n nock(host, { allowUnmocked: true })\n .get('/countries')\n .reply(200);\n```\n\n","plain_title":"не удается подключиться connect ECONNREFUSED 127.0.0.1:80 nock(host, { allowUnmocked: true }) .get('/countries') .reply(200); ","creator":{"public_name":"Helen K","id":144490,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":165296,"body":"**Helen Kyryliuk**, здравствуйте. Сохраните пожалуйста свое решение и скиньте сюда ссылку на него.","topic_id":80596},{"creator":{"public_name":"Helen K","id":144490,"is_tutor":false},"id":165395,"body":"ссылка на решение https://pastebin.com/ee2yep0F\n\n\n**Output:**\n````npm test\n\n> test\n> jest --colors\n\n FAIL __tests__/test.jsx\n ✕ changes button text on click (1159 ms)\n\n ● changes button text on click\n\n connect ECONNREFUSED 127.0.0.1:80\n\n\n\n ● changes button text on click\n\n Unable to find role=\"listitem\"\n\n Ignored nodes: comments, script, style\n <body>\n <div>\n <div>\n <form>\n <div\n class=\"form-group\"\n >\n <input\n class=\"form-control\"\n placeholder=\"Enter Country\"\n type=\"text\"\n value=\"a\"\n />\n </div>\n </form>\n </div>\n </div>\n </body>\n\n 30 | await userEvent.type(textInput, 'a');\n 31 |\n > 32 | await waitFor(() => expect(screen.getAllByRole('listitem').find((listitem) => listitem.textContent === /afghanistan/i)).toBeInTheDocument());\n | ^\n 33 | });\n 34 | // END\n 35 |\n\n at waitForWrapper (../../local/lib/hexlet-javascript/node_modules/@testing-library/dom/dist/wait-for.js:187:27)\n at Object.<anonymous> (__tests__/test.jsx:32:9)````","topic_id":80596},{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":165410,"body":"**Helen Kyryliuk**, на всякий случай посмотрите статью https://help.hexlet.io/ru/articles/282174-kak-soxranit-svoe-resenie. Вы можете сохранить решение в упражнении, для этого можно обойтись без сторонних сервисов. По поводу ошибки: вы настраиваете мок запроса на `/countries`, при этом в тестах заполняется поле инпута, а значит запрос будет выглядеть так `/countries?term=a`, поэтому ошибка","topic_id":80596}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Testing Library React","entity_url":null,"active":true}}],"lesson":{"exercise":null,"units":[{"id":4570,"name":"theory","url":"/courses/frontend-testing-browser/lessons/testing-library-react/theory_unit"}],"links":[],"ordered_units":[{"id":4570,"name":"theory","url":"/courses/frontend-testing-browser/lessons/testing-library-react/theory_unit"}],"id":2036,"slug":"testing-library-react","state":"approved","name":"Testing Library React","course_order":600,"goal":"Учимся использовать React Testing Library","self_study":null,"theory_video_provider":"vimeo","theory_video_uid":"560742520","theory":"# React Testing Library \n\n## Hexlet\n\n<!-- https://github.com/skidding/react-testing-examples/tree/master/tests/jest-rtl\nhttps://react-testing-examples.com/jest-rtl/\nhttps://noriste.github.io/reactjsday-2019-testing-course/book/react-testing-library/dom-testing-library.html -->\n\n<!-- https://jaketrent.com/post/testing-react-with-jsdom\nhttps://www.robinwieruch.de/react-testing-library\nhttps://github.com/NoriSte/ui-testing-best-practices -->\n\n---\n\n# React Testing Library \n\n* Ставится поверх `DOM Testing Library` добавляя `API` для работы с `React` компонентами\n* То есть ваши тесты будут работать не с экземплярами отрендеренных React-компонентов, а с реальными DOM узлами\n\n---\n\n# Цели\n \n* Поддерживаемые тесты\n* Уверенность в тестах\n* Избегайте проверок деталей реализации\n * Внутреннее состояние компонента\n * Внутренние методы компонента\n * Методы жизненного цикла компонента\n * Дочерние компоненты\n* Долгоиграющие тесты\n * Рефакторинг не ломает ваши тесты\n\n---\n\n```javascript\n// import react-testing methods\nimport { render } from '@testing-library/react'\n\n// импорт тестируемого компонента\nimport Button from '../Button'\n\ntest('button', async () => {\n // Выбираем\n // Действуем\n // Проверяем\n})\n```\n\n---\n\n# Методы API\n\n---\n\n## render\n\n```jsx\nimport { render } from '@testing-library/react'\n\nrender(<div />)\nrender(<App />)\n```\n\n---\n\n```javascript\ntest('renders personalized greeting', async () => {\n const { getByText } = render(<HelloMessage name=\"Ruslan\" />)\n\n await waitForElement(() => getByText(/hello ruslan/i))\n})\n```\n\n---\n\n```jsx\ntest('renders a message', () => {\n const { container, getByText, rerender, unmount } = render(<Greeting name=\"Ivan\" />)\n expect(getByText('Hello, Ivan!')).toBeInTheDocument()\n expect(container.firstChild).toMatchInlineSnapshot(`\n <h1>Hello, Ivan!</h1>\n `)\n\n // ре-рендер того же компонента с другими пропсами\n rerender(<Greeting name=\"Ruslan\" />)\n expect(getByText('Hello, Ruslan!')).toBeInTheDocument()\n\n unmount()\n})\n```\n\n---\n\n```jsx\nimport { render, screen } from '@testing-library/react'\nimport App from './App'\n\ndescribe('App', () => {\n test('renders App component', () => {\n render(<App />)\n\n screen.debug() // выведет весь DOM\n })\n})\n```\n\n---\n\n* Замена библиотеке `Enzyme`\n * Концептуальное отличие\n * НЕ поддерживает shallow rendering\n* На RTL невозможно мигрировать с `Enzyme`\n* Избегайте мока компонентов\n * если очень нужно -> `jest.fn`\n\n\n---\n\n<style scoped>\nsection {\n background: white;\n}\n</style>\n\n\n\n\n---\n\nРекомендуем использовать библиотеку `Mock Service Worker` library для декларативного мока взаимодействия с API в ваших тестах вместо того, чтобы делать стаб `window.fetch`.\n\n---\n\n\n```javascript\n// объявляем какой запрос к API мокать\nconst server = setupServer(\n rest.get('/users', (req, res, ctx) => {\n return res(ctx.json({ users: [...] }));\n });\n);\n\nbeforeAll(() => server.listen());\nafterEach(() => server.resetHandlers());\nafterAll(() => server.close());\n\n// ... \n\ntest('filter users list', async () => {\n // ...\n});\n```\n\n---\n\n\n\n# Events\n\n---\n\n```jsx\ntest('change values via the fireEvent.change method', () => {\n const handleChange = jest.fn()\n const { container } = render(<input type=\"text\" onChange={handleChange} />)\n const input = container.firstChild\n fireEvent.change(input, { target: { value: 'a' } })\n expect(handleChange).toHaveBeenCalledTimes(1)\n expect(input.value).toBe('a')\n})\n```\n\n---\n\n```jsx\ntest('change values via the fireEvent.change method', () => {\n const handleChange = jest.fn()\n const { findByRole } = render(<input type=\"text\" onChange={handleChange} />)\n const input = findByRole('textbox')\n fireEvent.change(input, { target: { value: 'a' } })\n expect(handleChange).toHaveBeenCalledTimes(1)\n expect(input.value).toBe('a')\n})\n```\n\n---\n\n```jsx\n\ntest('checkboxes (and radios) must use fireEvent.click', () => {\n const handleChange = jest.fn();\n const { findByRole } = render(;\n <input type=\"checkbox\" onChange={handleChange} />\n );\n const checkbox = findByRole('checkbox');\n fireEvent.click(checkbox);\n expect(handleChange).toHaveBeenCalledTimes(1);\n expect(checkbox.checked).toBe(true);\n});\n\n```\n\n\n---\n\n```jsx\nconst Button = ({ onClick, children }) => (\n <button onClick={onClick}>{children}</button>\n)\n```\n\n```jsx\nimport { render, screen, fireEvent } from '@testing-library/react'\nimport Button from '../Button'\n\ntest('calls onClick prop when clicked', () => {\n const handleClick = jest.fn()\n render(<Button onClick={handleClick}>Click Me</Button>)\n fireEvent.click(screen.getByText(/click me/i))\n expect(handleClick).toHaveBeenCalledTimes(1)\n})\n```\n\n---\n\nReact Testing Library не особо заботят реальные компоненты\n\n---\n\n```jsx\nimport React from 'react'\n\nfunction App() {\n const [search, setSearch] = React.useState('')\n\n function handleChange(event) {\n setSearch(event.target.value)\n }\n\n return (\n <div>\n <Search value={search} onChange={handleChange}>\n Search:\n </Search>\n\n <p>\n Searches for\n {search ? search : '...'}\n </p>\n </div>\n )\n}\n\nfunction Search({ value, onChange, children }) {\n return (\n <div>\n <label htmlFor=\"search\">{children}</label>\n <input\n id=\"search\"\n type=\"text\"\n value={value}\n onChange={onChange}\n />\n </div>\n )\n}\n\nexport default App\n```\n\n---\n\n```html\n<body>\n <div>\n <div>\n <div>\n <label for=\"search\">Search:</label>\n <input id=\"search\" type=\"text\" value=\"\" />\n </div>\n <p>\n Searches for\n ...\n </p>\n </div>\n </div>\n</body>\n```\n\n---\n\n\n```jsx\n// Выбираем\nrender(<Fetch url=\"/user\" />)\n\n// Действуем\nfireEvent.click(screen.getByText('Load User'))\n\nawait waitFor(() =>\n // getByRole выбросит ошибку, если не найдет компонент\n screen.getByRole('heading'),\n)\n\n// Проверяем\nexpect(screen.getByRole('alert')).toHaveTextContent('Oops, failed to fetch!')\nexpect(screen.getByRole('button')).not.toBeDisabled()\n```\n\n---\n\n```jsx\n// Redux\nconst renderComponent = ({ count }) =>\n render(\n <Provider store={createStore(counterReducer, { count })}>\n <ReduxCounter />\n </Provider>,\n )\n\ntest('renders initial count', async () => {\n // рендерим новый экземпляр каждый раз чтобы избежать утечки стейта\n const { getByText } = renderComponent({ count: 5 })\n\n await waitForElement(() => getByText(/clicked 5 times/i))\n})\n\ntest('increments count', async () => {\n // рендерим новый экземпляр каждый раз чтобы избежать утечки стейта\n const { getByText } = renderComponent({ count: 5 })\n\n fireEvent.click(getByText('+1'))\n await waitForElement(() => getByText(/clicked 6 times/i))\n})\n```\n\n---\n\n```jsx\nimport { render } from '@testing-library/react'\n\nfunction App() {\n const [text, setText] = React.useState('start')\n\n React.useEffect(() => {\n setTimeout(() => {\n setText('finish')\n }, 500)\n }, [text])\n\n return (\n <div>\n <h1>{text}</h1>\n </div>\n )\n}\n\ntest('render app', async () => {\n const { getByText, findByText } = render(<App />)\n\n getByText('start')\n await findByText('finish')\n})\n```\n\n---\n\n```jsx\nimport { render, waitForElementToBeRemoved } from '@testing-library/react'\n\nfunction App() {\n const [show, setShow] = React.useState(true)\n\n React.useEffect(() => {\n setTimeout(() => {\n setShow(false)\n }, 500)\n }, [])\n\n return <div>{show ? <h1>hello</h1> : null}</div>\n}\n\ntest('render app', async () => {\n const { getByText } = render(<App />)\n\n await waitForElementToBeRemoved(() => getByText('hello'))\n})\n```\n\n---\n\n```javascript\ntest('validation unique', async () => {\n nock('https://cors-anywhere.herokuapp.com')\n .get(`/${rssUrl}`)\n .reply(200, rssData)\n\n render(html)\n userEvent.type(elements.input, rssUrl)\n userEvent.click(elements.submit)\n\n await waitFor(() => {\n expect(screen.getByText(/RSS has been loaded/i)).toBeInTheDocument()\n })\n\n userEvent.type(elements.input, rssUrl)\n userEvent.click(elements.submit)\n\n await waitFor(() => {\n expect(screen.getByText(/RSS already exists/i)).toBeInTheDocument()\n })\n})\n```\n\n---\n\n```javascript\nimport { render, fireEvent } from '@testing-library/?????'\n\nimport Comp from '../Comp'\n\ntest('shows proper heading when rendered', () => {\n const { getByText } = render(Comp, { name: 'World' })\n\n expect(getByText('Hello World!')).toBeInTheDocument()\n})\n\n// Важно: это асинхронный тест, т.к. мы используем `fireEvent`\ntest('changes button text on click', async () => {\n const { getByText } = render(Comp, { name: 'World' })\n const button = getByText('Button')\n\n await fireEvent.click(button)\n\n expect(button).toHaveTextContent('Button Clicked')\n})\n```\n\n<!--\n---\n\n# Домашнее задание\n\n\nПротестируйте поле с автодополнением списка стран\n\n```\n\nhexlet program download frontend-testing-react testing-library-react\n\n```\n-->\n"},"lessonMember":null,"courseMember":null,"course":{"start_lesson":{"exercise":null,"units":[{"id":4569,"name":"theory","url":"/courses/frontend-testing-browser/lessons/web-drivers/theory_unit"}],"links":[],"ordered_units":[{"id":4569,"name":"theory","url":"/courses/frontend-testing-browser/lessons/web-drivers/theory_unit"}],"id":2035,"slug":"web-drivers","state":"approved","name":"WebDrivers","course_order":100,"goal":"Знакомимся с инструментами для взаимодействия с браузерами","self_study":null,"theory_video_provider":"vimeo","theory_video_uid":"558045248","theory":"## Web Drivers\n\nWeb Drivers - это инструменты для взаимодействия с браузером.\n\n* Интерфейс удаленного управления, который позволяет анализировать и управлять браузером\n* Платформонезависимый и не зависит от языка\n* Предоставляет набор интерфейсов для нахождения и управления элементами DOM\n* Не имеет прямого отношения к тестированию\n\n## Selenium\n\nSelenium — один из популярных фреймворков для тестирования. Поддерживается всеми основными платформами и на всех браузерах. Он позволяет автоматизировать тестирование, имитировать действия пользователей.\n\nИспользование:\n\n```javascript\nimport { Builder, By, Key, until } from 'selenium-webdriver'\n\ndescribe('web driver', () => {\n let driver\n\n test('google first result', async () => {\n // Создаём инстанс вебдрайвера\n driver = new Builder().forBrowser('chrome').build()\n\n // Выполняем переход на страницу\n driver.get('https://www.google.com')\n\n // Получаем элемент ввода\n const input = driver.findElement(By.name('q'))\n\n // Вызываем на элементе события нажатия клавиш (ввод в поиск и Enter)\n await input.sendKeys('hello', Key.ENTER)\n\n // Дожидаемся пока не появится элемент и получаем его\n const firstResult = await driver.wait(until.elementLocated(By.css('h3')), 10000)\n\n // Выводим содержимое элемента\n console.log(await firstResult.getAttribute('textContent'))\n }, 10000)\n\n afterEach(() => {\n driver.quit()\n })\n})\n```\n\nВ асинхронных запросах промисы должны возвращаться из тестов, иначе тесты не дожидаются выполнение асинхронных операций. Либо нужно использовать `async await`\n\n```javascript\nimport { Builder, By, Key } from 'selenium-webdriver'\n\nconst URL = 'http://svelte3-todo.surge.sh/'\n\ndescribe('web driver', () => {\n let driver\n\n // Создаём драйвер перед выполнением тестов\n beforeAll(() => {\n driver = new Builder()\n .forBrowser('chrome')\n .build()\n })\n\n // Тест добавления таска\n test('add a task', async () => {\n // Выполняем переход на страницу\n driver.get(URL)\n\n // Возвращаем промис из теста\n return driver.findElement(By.className('js-todo-input')).sendKeys('Build App', Key.ENTER)\n // Асинхнронные запросы оборачиваем в цепочку промиса\n .then(() => driver.getPageSource())\n .then((source) => {\n expect(source.includes('Build App')).toBe(true)\n })\n }, 1000)\n\n // Тест отметки таска как пройденного\n test('mark a task complete', () => {\n driver.get(URL)\n\n return driver.findElement(By.className('js-todo-input')).sendKeys('Build App', Key.ENTER) // Создаём таск\n // Перед изменением таска, проверяем что он не завершен, для этого проверяем класс\n .then(() => driver.findElement(By.className('todo-item')).getAttribute('class')) // получаем класс, асинхронный запрос\n .then((className) => {\n // проверяем что класс не содержит 'done'\n expect(className.includes('done')).toBe(false)\n // Вызываем клик по задаче (отмечаем что она завершена)\n // это асинхронная операция, поэтому возвращаем промис\n return driver.findElement(By.css('label')).click()\n })\n // Снова получаем класс, асинхронный запрос, поэтому оборачиваем в цепочку then\n .then(() => driver.findElement(By.className('todo-item')).getAttribute('class'))\n .then((className) => {\n // Проверяем имя класса\n expect(className.includes('done')).toBe(true)\n })\n }, 1000)\n\n test('delete a task', () => {\n driver.get(URL)\n\n // Перед удалением также создаем таск\n return driver.findElement(By.className('js-todo-input')).sendKeys('Build App', Key.ENTER)\n // Кликаем по кнопке удаления\n .then(() => driver.findElement(By.className('delete-todo')).click())\n // Получаем содержимое страницы\n .then(() => driver.getPageSource())\n .then((source) => {\n // Проверяем что таск удалён\n expect(source.includes('Build App')).toBe(false)\n })\n }, 1000)\n\n afterAll(() => {\n driver.quit()\n })\n})\n```\n\nТоже самое с `async await`:\n\n```javascript\nimport { Builder, By, Key } from 'selenium-webdriver'\n\nconst URL = 'http://svelte3-todo.surge.sh/'\n\ndescribe('web driver', () => {\n let driver\n\n // Создаём драйвер перед выполнением тестов\n beforeAll(() => {\n driver = new Builder()\n .forBrowser('chrome')\n .build()\n })\n\n // Тест добавления таска\n test('add a task', async () => {\n // Выполняем переход на страницу\n driver.get(URL)\n\n // Создаём таск\n await driver.findElement(By.className('js-todo-input')).sendKeys('Build App', Key.ENTER)\n const source = await driver.getPageSource()\n expect(source.includes('Build App')).toBe(true)\n }, 1000)\n\n // Тест отметки таска как пройденного\n test('mark a task complete', async () => {\n driver.get(URL)\n\n // Создаём таск\n await driver.findElement(By.className('js-todo-input')).sendKeys('Build App', Key.ENTER)\n // Перед изменением таска, проверяем что он не завершен, для этого проверяем класс\n const classNameBefore = await driver.findElement(By.className('todo-item')).getAttribute('class') // получаем класс\n\n // проверяем что класс не содержит 'done'\n expect(classNameBefore.includes('done')).toBe(false)\n // Вызываем клик по задаче (отмечаем что она завершена)\n await driver.findElement(By.css('label')).click()\n // Снова получаем класс\n const classNameAfter = await driver.findElement(By.className('todo-item')).getAttribute('class')\n\n // Проверяем имя класса\n expect(classNameAfter.includes('done')).toBe(true)\n }, 1000)\n\n test('delete a task', async () => {\n driver.get(URL)\n\n // Перед удалением также создаем таск\n await driver.findElement(By.className('js-todo-input')).sendKeys('Build App', Key.ENTER)\n // Кликаем по кнопке удаления\n await driver.findElement(By.className('delete-todo')).click()\n // Получаем содержимое страницы\n const source = await driver.getPageSource()\n // Проверяем что таск удалён\n expect(source.includes('Build App')).toBe(false)\n }, 1000)\n\n afterAll(() => {\n driver.quit()\n })\n})\n```\n\n## Cypress\n\nCypress — это e2e фреймворк для тестирования на JS, имеет свой тест-раннер, поддерживает множество языков.\n\nКомпонентное тестирование:\n\n```jsx\nimport * as React from 'react'\nimport { mount } from '@cypress/react'\nimport Button from './Button.jsx'\n\nit('Button', () => {\n // Рендерим кнопку\n mount(<Button>Text button</Button>)\n // Кликаем по кнопке\n cy.get('button').contains('Test button').click()\n})\n```\n\n```javascript\n// Тестируем завершения таска\nit('complete todo', () => {\n // Отрываем страницу\n cy.visit('/')\n // Находим элемент ввода, имитируем ввод имени таска и нажатие Enter\n cy.get('.new-todo').type('write tests{enter}')\n // Отмечаем выполнение таска\n cy.contains('.todo-list li', 'write tests').find('.toggle').check()\n\n // Проверяем наличие класса\n cy.contains('.todo-list li', 'write tests').should('have.class', 'completed')\n\n // При установленном плагине cypress-plugin-snapshots можно создавать скриншоты\n cy.get('.todoapp').toMatchImageSnapshot({\n imageConfig: {\n threshold: 0.001,\n },\n })\n})\n\n// Тест добавления таска\nit('adds todos', () => {\n // Открываем страницу\n cy.visit('/')\n\n // Создаём два таска\n cy.get('.new-todo')\n .type('write E2E tests{enter}')\n .type('add API tests as needed{enter}')\n\n // Проверяем что запросы были отправлены\n cy.request('/todos')\n .its('body')\n .should('have.length', 2)\n .and((items) => {\n // ...\n })\n})\n```\n\n## Playwright\n\nPlaywright — библиотека от Microsoft, так же поддерживает множество языков. Не имеет своего тестраннера.\n\nПример использования:\n\n```javascript\n// Подключаем библиотеку\nimport playwright from 'playwright';\n\n(async () => {\n // Тестируем на разных браузеров в цикле\n for (const browserType of ['chromium', 'firefox', 'webkit']) {\n // Запускаем браузер, получаем инстанс браузера\n const browser = await playwright[browserType].launch()\n // Получаем контекст браузера\n const context = await browser.newContext()\n // Получаем инстанс страницы\n const page = await context.newPage()\n // Открываем страницу\n await page.goto('https://mail.ru')\n // Вызываем событие\n await page.click('[data-testid=\"enter-password\"]')\n // Создаем скриншот\n await page.screenshot({ path: `mail-${browserType}.png` })\n // Закрываем браузер\n await browser.close()\n }\n})()\n```\n\nИмитация другого устройства:\n\n```javascript\nimport { webkit, devices } from 'playwright'\n\nconst iPhone11 = devices['iPhone 11 Pro']\n\ndescribe(() => {\n test('Main test', async () => {\n // Запускаем браузер, получаем инстанс браузера\n const browser = await webkit.launch()\n // Получаем контекст устройства, задаём свои настройки\n const context = await browser.newContext({\n ...iPhone11,\n locale: 'en-US',\n geolocation: { longitude: 12.492507, latitude: 41.889938 },\n permissions: ['geolocation'],\n })\n // Получаем инстанс страницы\n const page = await context.newPage()\n // Открываем страницу\n await page.goto('https://maps.google.com')\n // Вызываем событие\n await page.click('text=\"Your location\"')\n // Ждём выполнение запроса\n await page.waitForRequest(/.*preview\\/pwa/)\n // Создаём скриншот\n await page.screeshot({ path: 'iphone-11.png' })\n // Закрываем браузер\n await browser.close()\n })\n})\n```\n\n## Puppeteer\n\nPuppeteer — библиотека с упором на chrome. Синтаксис очень похож на playwright:\n\n```javascript\n// Подключаем библиотеку\nimport puppeteer from 'puppeteer'\n\ndescribe(() => {\n test('Main test', async () => {\n // Запускаем браузер и получаем инстанс браузера\n const browser = await puppeteer.launch()\n // Получаем инстанс страницы\n const page = await browser.newPage()\n // Открываем страницу\n await page.goto('https://mail.ru')\n // Вызываем событие\n await page.click('[data-testid=\"enter-password\"]')\n // Создаем скриншот\n await page.screenshot({ path: 'example.png' })\n\n // Закрываем браузер\n await browser.close()\n })\n})\n```\n"},"id":236,"slug":"frontend-testing-browser","challenges_count":0,"name":"Тестирование фронтенда","allow_indexing":true,"state":"approved","course_state":"finished","pricing_type":"paid","description":"На этом курсе вы изучите тестирование фронтенда. Вы узнаете больше о написании e2e-тестов с использованием веб-драйверов, работе с ошибками и фантомными падениями. В итоге вы научитесь создавать надежные тесты в браузерной среде с помощью паттерна Page Object для уменьшения хрупкости и дублирования. Вы также научитесь изолировать бэкенд и тестировать фронтенд с помощью быстрого testing-library в связке с Jest и JSDOM. 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stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-lock "><path d="M5 13a2 2 0 0 1 2 -2h10a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-6"></path><path d="M11 16a1 1 0 1 0 2 0a1 1 0 0 0 -2 0"></path><path d="M8 11v-4a4 4 0 1 1 8 0v4"></path></svg></div><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Тестирование фронтенда</p></div><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size);margin-bottom:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="1">Теория: Testing Library React</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Testing Library React","inLanguage":"ru","isPartOf":{"@type":"LearningResource","name":"Тестирование фронтенда"},"isAccessibleForFree":"False","hasPart":{"@type":"WebPageElement","isAccessibleForFree":"False","cssSelector":".paywalled"}}</script><div class=""><div style="--alert-color:var(--mantine-color-indigo-light-color);margin-bottom:var(--mantine-spacing-lg);font-size:var(--mantine-font-size-lg)" class="m_66836ed3 mantine-Alert-root" id="mantine-_R_remqrdub_" role="alert" aria-describedby="mantine-_R_remqrdub_-body" aria-labelledby="mantine-_R_remqrdub_-title"><div class="m_a5d60502 mantine-Alert-wrapper"><div class="m_667f2a6a mantine-Alert-icon"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-rocket "><path d="M4 13a8 8 0 0 1 7 7a6 6 0 0 0 3 -5a9 9 0 0 0 6 -8a3 3 0 0 0 -3 -3a9 9 0 0 0 -8 6a6 6 0 0 0 -5 3"></path><path d="M7 14a6 6 0 0 0 -3 6a6 6 0 0 0 6 -3"></path><path d="M14 9a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path></svg></div><div class="m_667c2793 mantine-Alert-body"><div class="m_6a03f287 mantine-Alert-title"><span id="mantine-_R_remqrdub_-title" class="m_698f4f23 mantine-Alert-label">Полный доступ к материалам</span></div><div id="mantine-_R_remqrdub_-body" class="m_7fa78076 mantine-Alert-message"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Зарегистрируйтесь и получите доступ к этому и десяткам других курсов</p><a style="--button-height:var(--button-height-xs);--button-padding-x:var(--button-padding-x-xs);--button-fz:var(--mantine-font-size-xs);--button-bg:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-hover:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-color:var(--mantine-color-white);--button-bd:none" class="mantine-focus-auto mantine-active m_77c9d27d mantine-Button-root m_87cf2631 mantine-UnstyledButton-root" data-variant="gradient" data-size="xs" href="/u/new"><span class="m_80f1301b mantine-Button-inner"><span class="m_811560b9 mantine-Button-label">Зарегистрироваться</span></span></a></div></div></div></div></div><div class="paywalled m_d08caa0 mantine-Typography-root"><h1 id="heading-1-1">React Testing Library</h1>
<h2 id="heading-2-2">Hexlet</h2>
<!-- -->
<!-- -->
<hr/>
<h1 id="heading-1-3">React Testing Library</h1>
<ul>
<li>Ставится поверх <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">DOM Testing Library</code> добавляя <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">API</code> для работы с <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">React</code> компонентами</li>
<li>То есть ваши тесты будут работать не с экземплярами отрендеренных React-компонентов, а с реальными DOM узлами</li>
</ul>
<hr/>
<h1 id="heading-1-4">Цели</h1>
<ul>
<li>Поддерживаемые тесты</li>
<li>Уверенность в тестах</li>
<li>Избегайте проверок деталей реализации
<ul>
<li>Внутреннее состояние компонента</li>
<li>Внутренние методы компонента</li>
<li>Методы жизненного цикла компонента</li>
<li>Дочерние компоненты</li>
</ul>
</li>
<li>Долгоиграющие тесты
<ul>
<li>Рефакторинг не ломает ваши тесты</li>
</ul>
</li>
</ul>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">// import react-testing methods
import { render } from '@testing-library/react'
// импорт тестируемого компонента
import Button from '../Button'
test('button', async () => {
// Выбираем
// Действуем
// Проверяем
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<h1 id="heading-1-5">Методы API</h1>
<hr/>
<h2 id="heading-2-6">render</h2>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">import { render } from '@testing-library/react'
render(<div />)
render(<App />)</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">test('renders personalized greeting', async () => {
const { getByText } = render(<HelloMessage name="Ruslan" />)
await waitForElement(() => getByText(/hello ruslan/i))
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">test('renders a message', () => {
const { container, getByText, rerender, unmount } = render(<Greeting name="Ivan" />)
expect(getByText('Hello, Ivan!')).toBeInTheDocument()
expect(container.firstChild).toMatchInlineSnapshot(`
<h1>Hello, Ivan!</h1>
`)
// ре-рендер того же компонента с другими пропсами
rerender(<Greeting name="Ruslan" />)
expect(getByText('Hello, Ruslan!')).toBeInTheDocument()
unmount()
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">import { render, screen } from '@testing-library/react'
import App from './App'
describe('App', () => {
test('renders App component', () => {
render(<App />)
screen.debug() // выведет весь DOM
})
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<ul>
<li>Замена библиотеке <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">Enzyme</code>
<ul>
<li>Концептуальное отличие</li>
<li>НЕ поддерживает shallow rendering</li>
</ul>
</li>
<li>На RTL невозможно мигрировать с <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">Enzyme</code></li>
<li>Избегайте мока компонентов
<ul>
<li>если очень нужно -> <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">jest.fn</code></li>
</ul>
</li>
</ul>
<hr/>
<style scoped="">
section {
background: white;
}
</style>
<p><img style="--image-object-fit:contain;width:auto" class="m_9e117634 mantine-Image-root" src="/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEyNSwicHVyIjoiYmxvYl9pZCJ9fQ==--32b20e32232ccaf2484438dbae5d11ced0422b7e/react-testing-library.png" alt="width" loading="lazy"/></p>
<hr/>
<p>Рекомендуем использовать библиотеку <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">Mock Service Worker</code> library для декларативного мока взаимодействия с API в ваших тестах вместо того, чтобы делать стаб <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">window.fetch</code>.</p>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">// объявляем какой запрос к API мокать
const server = setupServer(
rest.get('/users', (req, res, ctx) => {
return res(ctx.json({ users: [...] }));
});
);
beforeAll(() => server.listen());
afterEach(() => server.resetHandlers());
afterAll(() => server.close());
// ...
test('filter users list', async () => {
// ...
});</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<h1 id="heading-1-7">Events</h1>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">test('change values via the fireEvent.change method', () => {
const handleChange = jest.fn()
const { container } = render(<input type="text" onChange={handleChange} />)
const input = container.firstChild
fireEvent.change(input, { target: { value: 'a' } })
expect(handleChange).toHaveBeenCalledTimes(1)
expect(input.value).toBe('a')
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">test('change values via the fireEvent.change method', () => {
const handleChange = jest.fn()
const { findByRole } = render(<input type="text" onChange={handleChange} />)
const input = findByRole('textbox')
fireEvent.change(input, { target: { value: 'a' } })
expect(handleChange).toHaveBeenCalledTimes(1)
expect(input.value).toBe('a')
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">test('checkboxes (and radios) must use fireEvent.click', () => {
const handleChange = jest.fn();
const { findByRole } = render(;
<input type="checkbox" onChange={handleChange} />
);
const checkbox = findByRole('checkbox');
fireEvent.click(checkbox);
expect(handleChange).toHaveBeenCalledTimes(1);
expect(checkbox.checked).toBe(true);
});</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div class="m_5cb1b9c8 mantine-CodeHighlightTabs-root"><div style="--sa-corner-width:0px;--sa-corner-height:0px" class="m_7b14120b mantine-CodeHighlightTabs-filesScrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><div class="m_38d99e51 mantine-CodeHighlightTabs-files"><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" data-active="true" type="button"><span>jsx</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>jsx</span></button></div></div></div><div data-orientation="horizontal" class="m_c44ba933 mantine-ScrollArea-scrollbar" data-hidden="true" style="position:absolute;--sa-thumb-width:18px" data-mantine-scrollbar="true"></div><div class="m_c44ba933 mantine-ScrollArea-scrollbar" data-hidden="true" data-orientation="vertical" style="position:absolute;--sa-thumb-height:18px" data-mantine-scrollbar="true"></div></div><div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlightTabs-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlightTabs-controls" data-with-offset="true"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlightTabs-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlightTabs-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlightTabs-pre" data-with-offset="true"><code class="m_5caae6d3 mantine-CodeHighlightTabs-code">const Button = ({ onClick, children }) => (
<button onClick={onClick}>{children}</button>
)</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlightTabs-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><hr/>
<p>React Testing Library не особо заботят реальные компоненты</p>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">import React from 'react'
function App() {
const [search, setSearch] = React.useState('')
function handleChange(event) {
setSearch(event.target.value)
}
return (
<div>
<Search value={search} onChange={handleChange}>
Search:
</Search>
<p>
Searches for
{search ? search : '...'}
</p>
</div>
)
}
function Search({ value, onChange, children }) {
return (
<div>
<label htmlFor="search">{children}</label>
<input
id="search"
type="text"
value={value}
onChange={onChange}
/>
</div>
)
}
export default App</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code"><body>
<div>
<div>
<div>
<label for="search">Search:</label>
<input id="search" type="text" value="" />
</div>
<p>
Searches for
...
</p>
</div>
</div>
</body></code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">// Выбираем
render(<Fetch url="/user" />)
// Действуем
fireEvent.click(screen.getByText('Load User'))
await waitFor(() =>
// getByRole выбросит ошибку, если не найдет компонент
screen.getByRole('heading'),
)
// Проверяем
expect(screen.getByRole('alert')).toHaveTextContent('Oops, failed to fetch!')
expect(screen.getByRole('button')).not.toBeDisabled()</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">// Redux
const renderComponent = ({ count }) =>
render(
<Provider store={createStore(counterReducer, { count })}>
<ReduxCounter />
</Provider>,
)
test('renders initial count', async () => {
// рендерим новый экземпляр каждый раз чтобы избежать утечки стейта
const { getByText } = renderComponent({ count: 5 })
await waitForElement(() => getByText(/clicked 5 times/i))
})
test('increments count', async () => {
// рендерим новый экземпляр каждый раз чтобы избежать утечки стейта
const { getByText } = renderComponent({ count: 5 })
fireEvent.click(getByText('+1'))
await waitForElement(() => getByText(/clicked 6 times/i))
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">import { render } from '@testing-library/react'
function App() {
const [text, setText] = React.useState('start')
React.useEffect(() => {
setTimeout(() => {
setText('finish')
}, 500)
}, [text])
return (
<div>
<h1>{text}</h1>
</div>
)
}
test('render app', async () => {
const { getByText, findByText } = render(<App />)
getByText('start')
await findByText('finish')
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">import { render, waitForElementToBeRemoved } from '@testing-library/react'
function App() {
const [show, setShow] = React.useState(true)
React.useEffect(() => {
setTimeout(() => {
setShow(false)
}, 500)
}, [])
return <div>{show ? <h1>hello</h1> : null}</div>
}
test('render app', async () => {
const { getByText } = render(<App />)
await waitForElementToBeRemoved(() => getByText('hello'))
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">test('validation unique', async () => {
nock('https://cors-anywhere.herokuapp.com')
.get(`/${rssUrl}`)
.reply(200, rssData)
render(html)
userEvent.type(elements.input, rssUrl)
userEvent.click(elements.submit)
await waitFor(() => {
expect(screen.getByText(/RSS has been loaded/i)).toBeInTheDocument()
})
userEvent.type(elements.input, rssUrl)
userEvent.click(elements.submit)
await waitFor(() => {
expect(screen.getByText(/RSS already exists/i)).toBeInTheDocument()
})
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<hr/>
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import Comp from '../Comp'
test('shows proper heading when rendered', () => {
const { getByText } = render(Comp, { name: 'World' })
expect(getByText('Hello World!')).toBeInTheDocument()
})
// Важно: это асинхронный тест, т.к. мы используем `fireEvent`
test('changes button text on click', async () => {
const { getByText } = render(Comp, { name: 'World' })
const button = getByText('Button')
await fireEvent.click(button)
expect(button).toHaveTextContent('Button Clicked')
})</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
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