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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":"2026-02-26T20:01:36.052Z","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":"SkkvVaPegG-DhgHAS7XqyUmsi86qwNcr7kn3nRT0s8ilmORiUaAtDzXFJVhHuhq-iaWmZKL3KYlTqW3JRvNUpg","topics":[{"id":81860,"title":" Не совсем понятно почему теория урока об @testing-library/react а практика на \njest-puppeteer?","plain_title":" Не совсем понятно почему теория урока об @testing-library/react а практика на jest-puppeteer? ","creator":{"public_name":"Helen K","id":144490,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":167142,"body":"**Helen K**, направил вопрос автору урока. Подумаем с ним как поступить, возможно переделаем на testing-library","topic_id":81860}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Testing Library Best Practice","entity_url":null,"active":true}},{"id":88383,"title":"Выходит ошибка даже при вводе решения из ответа\nРешение: https://ru.hexlet.io/code_reviews/1028937\n\nmake: Entering directory '/usr/src/app'\nPORT=8080 suppressor pass 'make check'\n\nmake: *** [Makefile:8: test] Terminated\n\nstatus: finished → Упс, что то пошло не так, код работал слишком долго и был остановлен. Проверьте условия выхода из циклов.","plain_title":"Выходит ошибка даже при вводе решения из ответа Решение: https://ru.hexlet.io/code_reviews/1028937 make: Entering directory '/usr/src/app' PORT=8080 suppressor pass 'make check' make: *** [Makefile:8: test] Terminated status: finished → Упс, что то пошло не так, код работал слишком долго и был остановлен. Проверьте условия выхода из циклов. ","creator":{"public_name":"Evgeniy Valyaev","id":346674,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":176787,"body":"**Evgeniy Valyaev**, пока отключил упражнение. Разбираемся в чем проблема","topic_id":88383},{"creator":{"public_name":"Evgeniy Valyaev","id":346674,"is_tutor":false},"id":176736,"body":"Сделал сброс, ошибка все еще воспроизводится","topic_id":88383},{"creator":{"public_name":"Ivan Gagarinov","id":75907,"is_tutor":true},"id":176735,"body":"**Evgeniy Valyaev**, здравствуйте! Я обновил упражнение. Проверьте, пожалуйста, еще раз. Только нужно сделать сброс.","topic_id":88383}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Testing Library Best Practice","entity_url":null,"active":true}}],"lesson":{"exercise":null,"units":[{"id":4567,"name":"theory","url":"/courses/frontend-testing-browser/lessons/testing-library-best-practice/theory_unit"}],"links":[],"ordered_units":[{"id":4567,"name":"theory","url":"/courses/frontend-testing-browser/lessons/testing-library-best-practice/theory_unit"}],"id":2033,"slug":"testing-library-best-practice","state":"approved","name":"Testing Library Best Practice","course_order":700,"goal":"Знакомимся с Best Practice при тестировании","self_study":null,"theory_video_provider":"vimeo","theory_video_uid":"560864927","theory":"# Testing Library Best Practice\n\n## Hexlet\n\n<!-- https://www.youtube.com/watch?v=ROzqRsaL-yg -->\n\n---\n\n# Ограничения\n\n---\n\n```jsx\nimport { render, screen, fireEvent } from '@testing-library/react'\n\ntest('clicks on disabled button', () => {\n const handleClick = jest.fn()\n\n render(\n <button style={{ pointerEvents: 'none' }} onClick={handleClick}>\n Save\n </button>,\n )\n\n fireEvent.click(screen.getByRole('button'))\n expect(handleClick).not.toBeCalled()\n})\n```\n\n---\n\n\n\n---\n\n```jsx\ntest('styles', () => {\n const handleClick = jest.fn()\n\n render(\n <div style={{ position: 'absolute', left: '-300%' }}>\n <button onClick={handleClick}>\n Save\n </button>\n </div>,\n )\n\n fireEvent.click(screen.getByRole('button'))\n expect(handleClick).not.toBeCalled() // ❌\n})\n```\n\n---\n\n```jsx\ntest('click on hidden button', () => {\n const handleClick = jest.fn()\n\n render(\n <button data-testid=\"button\" style={{ display: 'none' }} onClick={handleClick}>\n Save\n </button>,\n )\n\n fireEvent.click(screen.getByTestId('button'))\n expect(handleClick).not.toBeCalled() // ❌\n})\n```\n\n---\n\n```jsx\ntest('click on hidden button', () => {\n const handleClick = jest.fn()\n\n render(\n <button style={{ display: 'none' }} onClick={handleClick}>\n Save\n </button>,\n )\n\n fireEvent.click(screen.getByRole('button')) // ❌\n expect(handleClick).not.toBeCalled()\n})\n```\n\n---\n\n\n\n---\n\n```jsx\ntest('bounding client rect', async () => {\n const handleClick = jest.fn()\n\n render(\n <button id=\"button\" style={{ width: 100, height: 100 }} onClick={handleClick}>\n Save\n </button>,\n )\n\n const button = screen.getByRole('button')\n expect(button.getBoundingClientRect().height).toBe(100)\n expect(button.getBoundingClientRect().width).toBe(100)\n})\n```\n\n---\n\n\n\n---\n\n```jsx\ntest('z-index', async () => {\n const handleClick = jest.fn()\n\n render(\n <>\n <button id=\"button\" style={{ width: 100, height: 100 }} onClick={handleClick}>\n Save\n </button>\n <div style={{ position: 'absolute', left: 0, right: 0, top: 0, botton: 0, zIndex: 100 }}></div>\n </>,\n )\n\n fireEvent.click(screen.getByRole('button'))\n expect(handleClick).not.toBeCalled() // ❌\n})\n```\n\n---\n\n```jsx\nconst ReadonlyInput = () => {\n const [value, setValue] = React.useState('')\n\n return (\n <input readOnly value={value} onChange={event => setValue(event.target.value)} />\n )\n}\n\ntest('readonly input', async () => {\n render(\n <ReadonlyInput />,\n )\n\n fireEvent.change(screen.getByRole('textbox'), {\n target: { value: 'Hello' },\n })\n\n expect(screen.getByRole('textbox').value).toBe('')\n})\n```\n\n---\n\n\n\n---\n\n* стили\n* реальные возможности\n* обязательные поля\n\n---\n\n# Best Practice\n\n---\n\nИспользование обертки\n\n```jsx\n// ❌\nconst wrapper = render(<Example prop=\"1\" />)\nwrapper.rerender(<Example prop=\"2\" />)\n```\n\n```jsx\n// ✅\nconst { rerender } = render(<Example prop=\"1\" />)\nrerender(<Example prop=\"2\" />)\n```\n\n```jsx\n// ✅\nconst view = render(<Example prop=\"1\" />)\nview.rerender(<Example prop=\"2\" />)\n```\n\n---\n\n\nДемонтирование деревьев в React, смонтированных при рендере\n\n```javascript\n// ❌\nimport { render, screen, cleanup } from '@testing-library/react'\nafterEach(cleanup)\n```\n\n```javascript\n// ✅\nimport { render, screen } from '@testing-library/react'\n```\n\n---\n\n```jsx\n// ❌\nconst { getByRole } = render(<Example />)\nconst errorMessageNode = getByRole('alert')\n```\n\n```jsx\n// ✅\nimport { render, screen } from '@testing-library/react'\nrender(<Example />)\nconst errorMessageNode = screen.getByRole('alert')\n```\n\n* Используйте screen\n * не деструктурируйте\n * можно использовать `screen.debug`\n\n---\n\n```javascript\nconst button = screen.getByRole('button', { name: /disabled button/i })\n```\n\n```javascript\n// ❌\nexpect(button.disabled).toBe(true)\n// Сообщение об ошибке:\n// expect(received).toBe(expected) // равенство проверяется Object.is\n//\n// Expected: true\n// Received: false\n```\n\n```javascript\n// ✅\nexpect(button).toBeDisabled()\n// Сообщение об ошибке:\n// Received element is not disabled:\n// <button />\n```\n\n---\n\n### Используйте верные селекторы\n\n```html\n<label>Username</label><input data-testid=\"username\" />\n```\n```javascript\n// ❌\nscreen.getByTestId('username')\n```\n\n<br>\n\n```html\n<label for=\"username\">Username</label><input id=\"username\" type=\"text\" />\n```\n\n```javascript\n// ✅\nscreen.getByRole('textbox', { name: /username/i })\n```\n\n---\n\n### Не используйте контейнер\n\n```jsx\n// ❌\nconst { container } = render(<Example />)\nconst button = container.querySelector('.btn-primary')\nexpect(button).toHaveTextContent(/click me/i)\n```\n\n```jsx\n// ✅\nrender(<Example />)\nscreen.getByRole('button', { name: /click me/i })\n```\n---\n\n# Не рекомендуется\n\n* button\n* .btn.btn-large\n* #main\n\n---\n\n### Селекторы по тексту\n\n```javascript\n// ❌\nscreen.getByTestId('submit-button')\n```\n\n```javascript\n// ✅\nscreen.getByRole('button', { name: /submit/i })\n```\n\n---\n\nВыбирайте элементы по информативному названию `aria`-свойств, которые читают скринридеры\nРаботает, даже если текстовое содержимое вашего элемента разбито на разные дочерние элементы\n\n```html\n<button><span>Hello</span> <span>World</span></button>\n```\n\n```javascript\n// ❌ падает со следующей ошибкой:\n// Unable to find an element with the text: /hello world/i. This could be\n// because the text is broken up by multiple elements. In this case, you can\n// provide a function for your text matcher to make your matcher more flexible.\nscreen.getByText(/hello world/i)\n```\n\n```javascript\n// ✅\nscreen.getByRole('button', { name: /hello world/i })\n```\n\n---\n\n### Используйте `find` вместо `waitFor`\n\n```javascript\n// ❌\nconst submitButton = await waitFor(() =>\n screen.getByRole('button', { name: /submit/i }),\n)\n```\n```javascript\n// ✅\nconst submitButton = await screen.findByRole('button', { name: /submit/i })\n```\n\n---\n\nПобочные эффекты в `waitFor`\n\nYou can't use snapshot assertions within waitFor\n\n```javascript\n// ❌\nawait waitFor(() => {\n fireEvent.keyDown(input, { key: 'ArrowDown' })\n expect(screen.getAllByRole('listitem')).toHaveLength(3)\n})\n```\n\n```javascript\n// ✅\nfireEvent.keyDown(input, { key: 'ArrowDown' })\nawait waitFor(() => {\n expect(screen.getAllByRole('listitem')).toHaveLength(3)\n})\n```\n\n---\n\n* Используйте только `query*` для утверждений о том, что элемент не может быть найден\n* Используйте `user-event`\n* Используйте плагины для линтера для Testing Library\n - `eslint-plugin-testing-library`\n - `eslint-plugin-jest-dom`\n\n<!--\n---\n# Домашнее задание\n\n\nПротестируйте простую записную книжку с помощью `React Testing Library`\n\nСледуйте `best practices`\n\n```\n\nhexlet program download frontend-testing-react testing-library-best-practice\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. Знания из курса помогают программистам избежать ошибок и повысить надежность своих приложений.","kind":"sandbox","updated_at":"2026-01-20T11:44:42.610Z","language":"javascript","duration_cache":7200,"skills":["Писать надежные тесты в браузерной среде","Писать e2e тесты, используя веб-драйверы","Использовать паттерн Page Object","Тестировать фронтенд с помощью testing-library","Работать с асинхронностью"],"keywords":["e2e","page object","JSDOM","testing 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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 Best Practice</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Testing Library Best Practice","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">Testing Library Best Practice</h1>
<h2 id="heading-2-2">Hexlet</h2>
<!-- -->
<hr/>
<h1 id="heading-1-3">Ограничения</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">import { render, screen, fireEvent } from '@testing-library/react'
test('clicks on disabled button', () => {
const handleClick = jest.fn()
render(
<button style={{ pointerEvents: 'none' }} onClick={handleClick}>
Save
</button>,
)
fireEvent.click(screen.getByRole('button'))
expect(handleClick).not.toBeCalled()
})</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/>
<p><img style="--image-object-fit:contain;width:auto" class="m_9e117634 mantine-Image-root" src="/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEzNSwicHVyIjoiYmxvYl9pZCJ9fQ==--89d2331253664e02388bba85b7161b5323ec8b44/1.png" alt="width" loading="lazy"/></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">test('styles', () => {
const handleClick = jest.fn()
render(
<div style={{ position: 'absolute', left: '-300%' }}>
<button onClick={handleClick}>
Save
</button>
</div>,
)
fireEvent.click(screen.getByRole('button'))
expect(handleClick).not.toBeCalled() // ❌
})</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('click on hidden button', () => {
const handleClick = jest.fn()
render(
<button data-testid="button" style={{ display: 'none' }} onClick={handleClick}>
Save
</button>,
)
fireEvent.click(screen.getByTestId('button'))
expect(handleClick).not.toBeCalled() // ❌
})</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('click on hidden button', () => {
const handleClick = jest.fn()
render(
<button style={{ display: 'none' }} onClick={handleClick}>
Save
</button>,
)
fireEvent.click(screen.getByRole('button')) // ❌
expect(handleClick).not.toBeCalled()
})</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/>
<p><img style="--image-object-fit:contain;width:auto" class="m_9e117634 mantine-Image-root" src="/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEzNywicHVyIjoiYmxvYl9pZCJ9fQ==--0898b9b556966955e0fb718ead51c6b0d17105b2/2.png" alt="width" loading="lazy"/></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">test('bounding client rect', async () => {
const handleClick = jest.fn()
render(
<button id="button" style={{ width: 100, height: 100 }} onClick={handleClick}>
Save
</button>,
)
const button = screen.getByRole('button')
expect(button.getBoundingClientRect().height).toBe(100)
expect(button.getBoundingClientRect().width).toBe(100)
})</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/>
<p><img style="--image-object-fit:contain;width:auto" class="m_9e117634 mantine-Image-root" src="/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzE0MiwicHVyIjoiYmxvYl9pZCJ9fQ==--0b03810ade32b71c2aab52eb544b777391689c0e/3.png" alt="width" loading="lazy"/></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">test('z-index', async () => {
const handleClick = jest.fn()
render(
<>
<button id="button" style={{ width: 100, height: 100 }} onClick={handleClick}>
Save
</button>
<div style={{ position: 'absolute', left: 0, right: 0, top: 0, botton: 0, zIndex: 100 }}></div>
</>,
)
fireEvent.click(screen.getByRole('button'))
expect(handleClick).not.toBeCalled() // ❌
})</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">const ReadonlyInput = () => {
const [value, setValue] = React.useState('')
return (
<input readOnly value={value} onChange={event => setValue(event.target.value)} />
)
}
test('readonly input', async () => {
render(
<ReadonlyInput />,
)
fireEvent.change(screen.getByRole('textbox'), {
target: { value: 'Hello' },
})
expect(screen.getByRole('textbox').value).toBe('')
})</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/>
<p><img style="--image-object-fit:contain;width:auto" class="m_9e117634 mantine-Image-root" src="/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzE0MywicHVyIjoiYmxvYl9pZCJ9fQ==--e4e2bedc31896d8be66eebeea24af736a202cdf4/4.png" alt="width" loading="lazy"/></p>
<hr/>
<ul>
<li>стили</li>
<li>реальные возможности</li>
<li>обязательные поля</li>
</ul>
<hr/>
<h1 id="heading-1-4">Best Practice</h1>
<hr/>
<p>Использование обертки</p>
<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><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 wrapper = render(<Example prop="1" />)
wrapper.rerender(<Example prop="2" />)</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>Демонтирование деревьев в React, смонтированных при рендере</p>
<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>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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">// ❌
import { render, screen, cleanup } from '@testing-library/react'
afterEach(cleanup)</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/>
<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 { getByRole } = render(<Example />)
const errorMessageNode = getByRole('alert')</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><ul>
<li>Используйте screen
<ul>
<li>не деструктурируйте</li>
<li>можно использовать <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">screen.debug</code></li>
</ul>
</li>
</ul>
<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>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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 = screen.getByRole('button', { name: /disabled button/i })</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/>
<h3 id="heading-3-5">Используйте верные селекторы</h3>
<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>html</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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"><label>Username</label><input data-testid="username" /></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><br/>
<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>html</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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"><label for="username">Username</label><input id="username" type="text" /></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/>
<h3 id="heading-3-6">Не используйте контейнер</h3>
<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 { container } = render(<Example />)
const button = container.querySelector('.btn-primary')
expect(button).toHaveTextContent(/click me/i)</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/>
<h1 id="heading-1-7">Не рекомендуется</h1>
<ul>
<li>button</li>
<li>.btn.btn-large</li>
<li>#main</li>
</ul>
<hr/>
<h3 id="heading-3-8">Селекторы по тексту</h3>
<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>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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">// ❌
screen.getByTestId('submit-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>Выбирайте элементы по информативному названию <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">aria</code>-свойств, которые читают скринридеры
Работает, даже если текстовое содержимое вашего элемента разбито на разные дочерние элементы</p>
<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>html</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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"><button><span>Hello</span> <span>World</span></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/>
<h3 id="heading-3-9">Используйте <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">find</code> вместо <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">waitFor</code></h3>
<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>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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 submitButton = await waitFor(() =>
screen.getByRole('button', { name: /submit/i }),
)</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>Побочные эффекты в <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">waitFor</code></p>
<p>You can't use snapshot assertions within waitFor</p>
<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>javascript</span></button><button class="mantine-focus-auto m_5cac2e62 mantine-CodeHighlightTabs-file m_87cf2631 mantine-UnstyledButton-root" type="button"><span>javascript</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">// ❌
await waitFor(() => {
fireEvent.keyDown(input, { key: 'ArrowDown' })
expect(screen.getAllByRole('listitem')).toHaveLength(3)
})</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/>
<ul>
<li>Используйте только <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">query*</code> для утверждений о том, что элемент не может быть найден</li>
<li>Используйте <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">user-event</code></li>
<li>Используйте плагины для линтера для Testing Library
<ul>
<li><code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">eslint-plugin-testing-library</code></li>
<li><code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">eslint-plugin-jest-dom</code></li>
</ul>
</li>
</ul>
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