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<title>TDD vs BDD: основные отличия и выбор методологии</title>
<meta name="description" content="Узнайте о различиях между TDD и BDD, их принципах, плюсах и минусах, а также как выбрать подходящую методологию для разработки.">
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<meta property="og:description" content="Узнайте о различиях между TDD и BDD, их принципах, плюсах и минусах, а также как выбрать подходящую методологию для разработки.">
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Среди них выделяются две ключевые практики: TDD (Test-Driven Development) и BDD (Behavior-Driven Development). Оба подхода направлены на улучшение качества кода и минимизацию ошибок, но у них разные подходы и цели.","votes_count":3,"created_at":"2024-11-07T15:41:54.936Z","published_at":"2024-11-12T13:39:21.055Z","body":"В современной разработке ПО существует множество методологий, помогающих создавать качественные продукты. Среди них выделяются две ключевые практики: TDD (Test-Driven Development) и BDD (Behavior-Driven Development). Оба подхода направлены на улучшение качества кода и минимизацию ошибок, но у них разные подходы и цели.\r\n\r\n::programs\r\n\r\n## Содержание\r\n\r\n## Что такое TDD?\r\n\r\nTest-Driven Development (TDD) — это методология разработки программного обеспечения, при которой сначала пишутся тесты, а затем код, удовлетворяющий этим тестам. Идея состоит в том, чтобы написать минимальный тест для функциональности, затем написать минимальный код для успешного выполнения этого теста, после чего улучшать код, соблюдая требования теста.\r\n\r\nОсновные принципы TDD:\r\n- **Написание теста перед кодом.** Прежде чем начинать реализацию функционала, разработчик пишет тест, который проверяет его. \r\n- **Минимизация кода.** Код должен быть написан только для выполнения тестов, никакого лишнего функционала. \r\n- **Рефакторинг.** После того как тесты пройдены, код должен быть оптимизирован для повышения читаемости и производительности. \r\n\r\nПример теста для метода сложения чисел в TDD: \r\n\r\n```python\r\ndef add(a, b):\r\n return a + b\r\n\r\ndef test_addition():\r\n assert add(2, 3) == 5\r\n```\r\n\r\n\r\n> ### Читайте также:\r\n> Что такое [модульное тестирование](https://ru.hexlet.io/blog/posts/chto-takoe-modulnoe-testirovanie?promo_name=blog&promo_position=body&promo_type=link&promo_start=071124)?\r\n\r\n## Что такое BDD?\r\n\r\nBehavior-Driven Development (BDD) — это методология, фокусирующаяся на поведении системы с точки зрения пользователя. В отличие от TDD, где акцент делается на тестах для кода, в BDD ключевым является описание функциональности через поведение программы в терминах, понятных бизнесу и конечным пользователям. Это делает BDD особенно полезным при разработке требований совместно с заказчиком. \r\n\r\nОсновные принципы BDD:\r\n- **Понятные сценарии.** Сценарии описываются на естественном языке, чтобы их понимали все участники проекта, включая разработчиков, тестировщиков и представителей бизнеса. \r\n- **Поведенческое тестирование.** Тесты формулируются в терминах поведения программы, а не реализации кода. \r\n- **Использование специальных фреймворков.** Для BDD часто используются фреймворки вроде Cucumber или SpecFlow, которые позволяют писать тесты на естественном языке. \r\n\r\nПример сценария BDD для функциональности сложения:\r\n\r\n```bash\r\nFeature: Сложение чисел\r\n Scenario: Сложение двух положительных чисел\r\n Given два числа 2 и 3\r\n When я складываю их\r\n Then результат должен быть 5\r\n```\r\nТакой формат сценариев удобен для всех участников проекта, и его легко переводить в автоматические тесты.\r\n\r\n\r\n> ### Также полезно:\r\n> [Что такое спагетти-код](https://ru.hexlet.io/blog/posts/chto-takoe-spagetti-kod?promo_name=blog&promo_position=body&promo_type=link&promo_start=071124) и как его исправить\r\n\r\n## Различия между TDD и BDD\r\n\r\nХотя TDD и BDD имеют общую цель — улучшение качества кода, они решают эту задачу по-разному. \r\n\r\n- **Подход к тестам.** В TDD разработчик пишет тесты, фокусируясь на внутренней логике программы. В BDD акцент делается на поведение системы с точки зрения конечного пользователя. \r\n- **Язык тестов.** Тесты TDD пишутся на языке программирования, в котором создается приложение. В BDD используются сценарии на естественном языке (например, Gherkin), что делает их понятными для всех участников проекта. \r\n- **Сфокусированность.** TDD помогает улучшать структуру кода и его тестируемость. BDD же помогает обеспечить соответствие требований и поведения системы.\r\n\r\n\r\n> ### Читайте также:\r\n> 7 способов усовершенствовать [навыки чтения кода](https://ru.hexlet.io/blog/posts/improve-code-reading-skill?promo_name=blog&promo_position=body&promo_type=link&promo_start=071124) и как его исправить\r\n\r\n::posts \r\n\r\n## Как выбрать между TDD и BDD?\r\n\r\nДля проектов, требующих строгого контроля за качеством кода, TDD — оптимальный выбор, обеспечивающий надежность через автоматические тесты. Если важно вовлечение бизнеса и понятность для всех участников процесса, BDD станет отличным решением. Узнать больше о применении этих подходов в разработке и протестировать их на реальных задачах можно на [курсе «Инженер по тестированию»](https://ru.hexlet.io/programs/qa-engineer?promo_name=prof-qa&promo_position=body&promo_type=link&promo_start=071124). Программа не только охватывает теорию, но и дает практические навыки, необходимые для успешной работы с TDD и BDD.","reading_time":2,"url":"https://ru.hexlet.io/blog/posts/tdd-vs-bdd-v-chem-razlichiya-i-chto-vybrat-dlya-razrabotki","cover_thumb_variant":"https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTI2LCJwdXIiOiJibG9iX2lkIn19--ba9f714fb034c965fa52f4fb5fc2686e431373f3/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbMTAwLDUwXSwic2F2ZXIiOnsicXVhbGl0eSI6ODV9fSwicHVyIjoidmFyaWF0aW9uIn19--f0d4342fcdbdffa15c37fb02bfb423ac88d5c0c9/TD%D0%92.png","cover_list_variant":"https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTI2LCJwdXIiOiJibG9iX2lkIn19--ba9f714fb034c965fa52f4fb5fc2686e431373f3/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX2FuZF9wYWQiOls3MDgsMzU0XSwic2F2ZXIiOnsicXVhbGl0eSI6ODV9fSwicHVyIjoidmFyaWF0aW9uIn19--324dc52aa55ebe818c2a887ebcb832b9ad1c0381/TD%D0%92.png","cover_main_variant":"https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTI2LCJwdXIiOiJibG9iX2lkIn19--ba9f714fb034c965fa52f4fb5fc2686e431373f3/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX2FuZF9wYWQiOlsxNDU2LDcyOF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--b2ecf6121248a24883cda19469732b47b57f4e80/TD%D0%92.png","related_stacks_count":5},"relatedPosts":[{"model_name":"BlogPost","id":2753,"title":"Начало работы с PyTorch: создание и обучение нейронных сетей на Python","slug":"nachalo-raboty-s-pytorch-sozdanie-i-obuchenie-neyronnyh-setey-na-python","summary":"PyTorch — один из самых популярных фреймворков для работы с нейронными сетями на Python. 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Почему он так популярен? Подробно разбираемся в возможностях решения и его преимуществах для работы QA-специалистов.","created_at":"2024-10-07T15:01:20.868Z","published_at":"2024-11-27T16:30:39.974Z","cover_list_variant":"https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTg3LCJwdXIiOiJibG9iX2lkIn19--da9924e01831c028fa8675f1e29423e475872d17/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX2FuZF9wYWQiOls3MDgsMzU0XSwic2F2ZXIiOnsicXVhbGl0eSI6ODV9fSwicHVyIjoidmFyaWF0aW9uIn19--324dc52aa55ebe818c2a887ebcb832b9ad1c0381/11.png"},{"model_name":"BlogPost","id":2751,"title":"Использование YAML для конфигурации приложений на Python","slug":"ispolzovanie-yaml-dlya-konfiguratsii-prilozheniy-na-python","summary":"Сегодня разработка приложений требует гибких и удобных способов настройки. 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mantine-Group-root"><div style="--group-gap:calc(0.1875rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-end:var(--mantine-spacing-lg)" class="m_4081bf90 mantine-Group-root">12 ноября 2024 г.</div><div style="--group-gap:calc(0.1875rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><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-clock "><path d="M3 12a9 9 0 1 0 18 0a9 9 0 0 0 -18 0"></path><path d="M12 7v5l3 3"></path></svg></div>2 минуты</div><div style="--group-gap:calc(0.1875rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><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-thumb-up "><path d="M7 11v8a1 1 0 0 1 -1 1h-2a1 1 0 0 1 -1 -1v-7a1 1 0 0 1 1 -1h3a4 4 0 0 0 4 -4v-1a2 2 0 0 1 4 0v5h3a2 2 0 0 1 2 2l-1 5a2 3 0 0 1 -2 2h-7a3 3 0 0 1 -3 -3"></path></svg></div>3</div></div><div style="--ar-ratio:2" class="m_71ac47fc mantine-AspectRatio-root"><img style="--image-radius:var(--mantine-radius-md);--image-object-fit:cover;width:100%;height:100%" class="m_9e117634 mantine-Image-root" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTI2LCJwdXIiOiJibG9iX2lkIn19--ba9f714fb034c965fa52f4fb5fc2686e431373f3/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX2FuZF9wYWQiOlsxNDU2LDcyOF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--b2ecf6121248a24883cda19469732b47b57f4e80/TD%D0%92.png" alt="TDD vs BDD: в чем различия и что выбрать для разработки"/></div></div><div role="link" tabindex="0" style="cursor:pointer"><button style="display:block;width:100%" class="mantine-focus-auto m_87cf2631 mantine-UnstyledButton-root" type="button" aria-label="Присоединяйтесь к нашему Telegram-сообществу"><div style="background-color:light-dark(var(--mantine-color-gray-1), var(--mantine-color-dark-6))" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:auto;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-brand-telegram "><path d="M15 10l-4 4l6 6l4 -16l-18 7l4 2l2 6l3 -4"></path></svg></div>Присоединяйтесь к нашему Telegram-сообществу</div></div></button></div><div style="margin-bottom:var(--mantine-spacing-xl)" class="m_d08caa0 mantine-Typography-root"><p>В современной разработке ПО существует множество методологий, помогающих создавать качественные продукты. Среди них выделяются две ключевые практики: TDD (Test-Driven Development) и BDD (Behavior-Driven Development). Оба подхода направлены на улучшение качества кода и минимизацию ошибок, но у них разные подходы и цели.</p>
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mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">1 месяц</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Pytest</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Получите навык тестирования на Pytest</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzYyOSwicHVyIjoiYmxvYl9pZCJ9fQ==--f7aaf7f059fd35008c7c2fb722680196834212ab/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Usability%20testing-bro.png" alt="Pytest" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 3 900 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/js-jest-testing?promo_name=programs_list&promo_position=blog_post&promo_creative=catalog_card&promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">4 месяца</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Jest</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Навык тестирование с Jest </p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzk0NCwicHVyIjoiYmxvYl9pZCJ9fQ==--066dd4c0ae699132560b2d488e69d3f5c0e47eff/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Mobile%20testing-cuate.png" alt="Jest" loading="eager"/></div><div 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data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">6 месяцев</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Автоматизатор тестирования на Python</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Изучите Python, фреймворки для тестирования, автоматизация UI и API</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzkyMCwicHVyIjoiYmxvYl9pZCJ9fQ==--71cd9d863b21d7bfbd927cf623a7a2baaf4530ca/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Bug%20fixing-cuate.png" alt="Автоматизатор тестирования на Python" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 4 281 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/qa-auto-engineer-javascript?promo_name=programs_list&promo_position=blog_post&promo_creative=catalog_card&promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">6 месяцев</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Автоматизатор тестирования на JavaScript</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Изучите: Git, JavaScript, Playwright, юнит-, API- и UI-тесты, Docker и SQL</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzk0MSwicHVyIjoiYmxvYl9pZCJ9fQ==--9a9cd0863661374e7c92ea27b1270ac3299c0979/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Usability%20testing-pana.png" alt="Автоматизатор тестирования на JavaScript" loading="eager"/></div><div 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src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzkyNiwicHVyIjoiYmxvYl9pZCJ9fQ==--a6cffb3f9d8b79cd8231a2320e70f02b1975e66d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Mobile%20testing-amico.png" alt="Junit" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 3 900 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses?promo_name=programs_list&promo_position=blog_post&promo_creative=catalog_card&promo_type=card"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md);font-size:var(--mantine-font-size-h3)" class="m_8a5d1357 mantine-Title-root" data-order="2" data-responsive="true">Каталог</h2><p style="margin-bottom:auto" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Полный список доступных курсов по разным направлениям</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="/vite/assets/development-BVihs_d5.png" alt="Orientation"/></div></div></div></a></div></div></div></div></div>
<h2 id="heading-2-1">Содержание</h2>
<ul>
<li><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="#heading-2-2">Что такое TDD?</a></li>
<li><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="#heading-2-4">Что такое BDD?</a></li>
<li><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="#heading-2-6">Различия между TDD и BDD</a></li>
<li><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="#heading-2-8">Как выбрать между TDD и BDD?</a></li>
</ul>
<h2 id="heading-2-2">Что такое TDD?</h2>
<p>Test-Driven Development (TDD) — это методология разработки программного обеспечения, при которой сначала пишутся тесты, а затем код, удовлетворяющий этим тестам. Идея состоит в том, чтобы написать минимальный тест для функциональности, затем написать минимальный код для успешного выполнения этого теста, после чего улучшать код, соблюдая требования теста.</p>
<p>Основные принципы TDD:</p>
<ul>
<li><strong>Написание теста перед кодом.</strong> Прежде чем начинать реализацию функционала, разработчик пишет тест, который проверяет его.</li>
<li><strong>Минимизация кода.</strong> Код должен быть написан только для выполнения тестов, никакого лишнего функционала.</li>
<li><strong>Рефакторинг.</strong> После того как тесты пройдены, код должен быть оптимизирован для повышения читаемости и производительности.</li>
</ul>
<p>Пример теста для метода сложения чисел в TDD:</p>
<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">def add(a, b):
return a + b
def test_addition():
assert add(2, 3) == 5</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>
<blockquote>
<h3 id="heading-3-3">Читайте также:</h3>
<p>Что такое <a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/blog/posts/chto-takoe-modulnoe-testirovanie?promo_name=blog&promo_position=body&promo_type=link&promo_start=071124" rel="noopener noreferrer" target="_blank">модульное тестирование</a>?</p>
</blockquote>
<h2 id="heading-2-4">Что такое BDD?</h2>
<p>Behavior-Driven Development (BDD) — это методология, фокусирующаяся на поведении системы с точки зрения пользователя. В отличие от TDD, где акцент делается на тестах для кода, в BDD ключевым является описание функциональности через поведение программы в терминах, понятных бизнесу и конечным пользователям. Это делает BDD особенно полезным при разработке требований совместно с заказчиком.</p>
<p>Основные принципы BDD:</p>
<ul>
<li><strong>Понятные сценарии.</strong> Сценарии описываются на естественном языке, чтобы их понимали все участники проекта, включая разработчиков, тестировщиков и представителей бизнеса.</li>
<li><strong>Поведенческое тестирование.</strong> Тесты формулируются в терминах поведения программы, а не реализации кода.</li>
<li><strong>Использование специальных фреймворков.</strong> Для BDD часто используются фреймворки вроде Cucumber или SpecFlow, которые позволяют писать тесты на естественном языке.</li>
</ul>
<p>Пример сценария BDD для функциональности сложения:</p>
<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">Feature: Сложение чисел
Scenario: Сложение двух положительных чисел
Given два числа 2 и 3
When я складываю их
Then результат должен быть 5</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>
<p>Такой формат сценариев удобен для всех участников проекта, и его легко переводить в автоматические тесты.</p>
<blockquote>
<h3 id="heading-3-5">Также полезно:</h3>
<p><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/blog/posts/chto-takoe-spagetti-kod?promo_name=blog&promo_position=body&promo_type=link&promo_start=071124" rel="noopener noreferrer" target="_blank">Что такое спагетти-код</a> и как его исправить</p>
</blockquote>
<h2 id="heading-2-6">Различия между TDD и BDD</h2>
<p>Хотя TDD и BDD имеют общую цель — улучшение качества кода, они решают эту задачу по-разному.</p>
<ul>
<li><strong>Подход к тестам.</strong> В TDD разработчик пишет тесты, фокусируясь на внутренней логике программы. В BDD акцент делается на поведение системы с точки зрения конечного пользователя.</li>
<li><strong>Язык тестов.</strong> Тесты TDD пишутся на языке программирования, в котором создается приложение. В BDD используются сценарии на естественном языке (например, Gherkin), что делает их понятными для всех участников проекта.</li>
<li><strong>Сфокусированность.</strong> TDD помогает улучшать структуру кода и его тестируемость. BDD же помогает обеспечить соответствие требований и поведения системы.</li>
</ul>
<blockquote>
<h3 id="heading-3-7">Читайте также:</h3>
<p>7 способов усовершенствовать <a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/blog/posts/improve-code-reading-skill?promo_name=blog&promo_position=body&promo_type=link&promo_start=071124" rel="noopener noreferrer" target="_blank">навыки чтения кода</a> и как его исправить</p>
</blockquote>
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<h2 id="heading-2-8">Как выбрать между TDD и BDD?</h2>
<p>Для проектов, требующих строгого контроля за качеством кода, TDD — оптимальный выбор, обеспечивающий надежность через автоматические тесты. Если важно вовлечение бизнеса и понятность для всех участников процесса, BDD станет отличным решением. Узнать больше о применении этих подходов в разработке и протестировать их на реальных задачах можно на <a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ru.hexlet.io/programs/qa-engineer?promo_name=prof-qa&promo_position=body&promo_type=link&promo_start=071124" rel="noopener noreferrer" target="_blank">курсе «Инженер по тестированию»</a>. Программа не только охватывает теорию, но и дает практические навыки, необходимые для успешной работы с TDD и BDD.</p></div><div class=""><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap;margin-bottom:var(--mantine-spacing-lg)" class="m_4081bf90 mantine-Group-root"><div class="m_4451eb3a mantine-Center-root" data-inline="true"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><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-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 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