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Mastering React Test-Driven Development

Mastering React Test-Driven Development

By : Daniel Irvine
4.6 (12)
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Mastering React Test-Driven Development

Mastering React Test-Driven Development

4.6 (12)
By: Daniel Irvine

Overview of this book

Many programmers are aware of TDD but struggle to apply it beyond basic examples. This book teaches how to build complex, real-world applications using Test-Driven Development (TDD). It takes a first principles approach to the TDD process using plain Jest and includes test-driving the integration of libraries including React Router, Redux, and Relay (GraphQL). Readers will practice systematic refactoring while building out their own test framework, gaining a deep understanding of TDD tools and techniques. They will learn how to test-drive features such as client- and server-side form validation, data filtering and searching, navigation and user workflow, undo/redo, animation, LocalStorage access, WebSocket communication, and querying GraphQL endpoints. The book covers refactoring codebases to use the React Router and Redux libraries. via TDD. Redux is explored in depth, with reducers, middleware, sagas, and connected React components. The book also covers acceptance testing using Cucumber and Puppeteer. The book is fully up to date with React 16.9 and has in-depth coverage of hooks and the ‘act’ test helper.
Table of Contents (21 chapters)
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Section 1: First Principles of TDD
6
Section 2: Building a Single-Page Application
12
Section 3: Interactivity
16
Section 4: Acceptance Testing with BDD

Using the location query string to store component state

In the current implementation of CustomerSearch, we save the search configuration—the search term, the row limit, and the last row IDs—in a component state. But if we move the search configuration to the browser's query string, the user will be able to bookmark search pages, or share them with colleagues.

A search URL might look as follows:

/searchCustomers?searchTerm=An&limit=20&previousRowIds=20

What will need to change in our implementation to support this design change?

We'll replace onClick handlers with Link components. That skips the need to use the useState hook. Our search parameters will be passed back into our component when React Router re-renders the component with new props values.

One unfortunate thing about URLs as states, is that they tend to have a longer life than component...
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