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React Testing Library (RTL) is a lightweight and easy-to-use tool for testing the document object model (DOM) output of components. This book will show you how to use this modern, user-friendly tool to test React components, reducing the risk that your application will not work as expected in production.The book demonstrates code snippets that will allow you to implement RTL easily, helping you to understand the guiding principles of the DOM Testing Library to write tests from the perspective of the user. You'll explore the advantages of testing components from the perspective of individuals who will actually use your components, and use test-driven development (TDD) to drive the process of writing tests. As you advance, you'll discover how to add RTL to React projects, test components using the Context API, and also learn how to write user interface (UI) end-to-end tests using the popular Cypress library. Throughout this book, you’ll work with practical examples and useful explanations to be able to confidently create tests that don't break when changes are made.By the end of this React book, you will have learned all you need to be able to test React components confidently.
W ostatnich latach zdecydowanie wzrosła popularność frameworka React, pozwalającego w pełni skorzystać z możliwości nowoczesnych przeglądarek i urządzeń mobilnych. Nowym narzędziem służącym do testowania obiektowego modelu dokumentu (DOM) jest React Testing Library. Zostało ono zaprojektowane tak, aby ułatwiać projektantom pracę zgodną z podejściem test-driven development (TDD). Jest to bardzo cenna właściwość, gdyż prawidłowo napisane komponenty testowe znacznie obniżają ryzyko wystąpienia poważnych błędów aplikacji. W tej książce przystępnie wyjaśniono, w jaki sposób używać nowoczesnego narzędzia, jakim jest React Testing Library (RTL), do testowania komponentów napisanych w React. Dzięki niej zrozumiesz główne aspekty działania tej biblioteki. Nauczysz się symulować interakcje użytkownika i zrozumiesz podejście TDD. Znajdziesz tu wskazówki, jak tworzyć testy jednostkowe komponentów, które wchodzą w interakcje z interfejsami API, a także jak testować komponenty za pomocą takich bibliotek jak GraphQL i Redux. Zapoznasz się też z technikami testowania aplikacji, które podległy poważnej refaktoryzacji. Na koniec dowiesz się, jak pisać całościowe testy funkcjonalne z wykorzystaniem biblioteki Cypress i które wzorce projektowe są najbardziej przydatne do ustrukturyzowania profesjonalnego zbioru testów. W książce między innymi: wprowadzenie do RTL i jego zastosowań użycie jest-dom do rozbudowy testów opartych na RTL techniki tworzenia komponentów testowych łatwych do modyfikacji integracja zestawów testowych z Cucumber i Cypress podejście TDD React: z łatwością napiszesz doskonałe komponenty testowe!