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Home > Web Development > Test Driven Development > Mastering React Test-Driven Development
Mastering React Test-Driven Development
Mastering React Test-Driven Development

Mastering React Test-Driven Development: Build rock-solid, well-tested web apps with React, Redux and GraphQL

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Profile Icon Daniel Irvine
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Mastering React Test-Driven Development

Test-driving Data Input with React

In this chapter, we'll explore React forms and controlled components. We'll work with textboxes, select boxes, and radio buttons to build out these forms:

  • CustomerForm, which is used when adding or modifying customers, with three fields: first name, last name, and phone number
  • AppointmentForm, for adding and modifying appointments, which contains two fields for choosing a salon service and an appointment time

In the process of building these forms, we'll dig deeper into testing complex DOM trees.

The following topics will be covered in this chapter:

  • Extracting a test helper
  • Adding a form element
  • Accepting text input
  • Selecting from a dropdown
  • Making a choice from radio buttons

But, first, we will start with a little tidy-up.

Extracting a test helper

The Git tag for this section is extracting-helpers. It contains solutions to the exercises from the previous chapter, so if you haven't completed the Exercises section yourself, then you should move to this tag now so that you're up to date.

For more detailed instructions, see the To get the most out of this book section in the Preface.

In the first chapter, our test suites shared common code for constructing a DOM container element before each test. This element was used as the React root element. By doing this for each test, we avoided modifying global state. Let's extract that code so that we can re-use it across all of our test suites.

The shared code can be split into four parts:

  • A common declaration of container in the describe block, accessible by all tests
  • A beforeEach call to set container to a newly constructed container element...

Adding a form element

Let's create our first form:

  1. Create a new file called test/CustomerForm.test.js and add the following:
import React from 'react';
import { createContainer } from './domManipulators';
import { CustomerForm } from '../src/CustomerForm';

describe('CustomerForm', () => {
  let render, container;

  beforeEach(() => {
    ({ render, container } = createContainer());
  });
});
The call in the beforeEach block looks a little odd; it's a destructuring assignment where the variables have already been declared. The declaration and assignment are split in this way because the variables must be accessible within the scope of the describe block, but they must also be reassigned for each and every test. Each test gets its own container, independent of the other tests.
  1. Add the following test into the describe block:
it(...

Accepting text input

The Git tag for this section is accepting-text-input.

Let's render an HTML text input field onto the page. Add the following test to test/CustomerForm.test.js:

it('renders the first name field as a text box', () => {
  render(<CustomerForm />);
  const field = form('customer').elements.firstName;
  expect(field).not.toBeNull();
  expect(field.tagName).toEqual('INPUT');
  expect(field.type).toEqual('text');
});
This test makes use of the DOM form API: any form allows access to all of its input elements using the elements indexer. This is a simpler way of accessing form fields than CSS selectors, so I prefer to use it when it's an option.

There are three expectations in this test:

  • For there to be a form element with the name firstName
  • For it to be an input element
  • For it to have a type of text

Let's...

Selecting from a dropdown

The Git tag for this section is appointment-form.

Let's move on to creating our appointment form. This form is used to book an appointment for a customer. The first field is the service the customer requires: cut, color, blow-dry, and so on:

  1. Create a new file, test/AppointmentForm.test.js, with the following test and setup:
import React from 'react';
import { createContainer } from './domManipulators';
import { AppointmentForm } from '../src/AppointmentForm';

describe('AppointmentForm', () => {
  let render, container;

  beforeEach(() => {
    ({ render, container } = createContainer());
  });

  const form = id =>
    container.querySelector(`form[id="${id}"]`);

  it('renders a form', () => {
    render(<AppointmentForm />);
    expect(form('appointment')).not.toBeNull(...

Making a choice from radio buttons

The Git tag for this section is time-slot-table.

It's time to apply what we've learn to a more complicated HTML setup. In this section, we'll test-drive a whole bunch of interconnected elements. To make things harder, we'll also be manipulating times and dates using the standard JavaScript Date object. As you'll soon see, our tests give us a structure to our work that makes even complicated scenarios straightforward.

We'd like to display available time slots over the next seven days as a grid, with columns representing days and rows representing 30-minute time slots, just like a standard calendar view. The user will be able to quickly find a time slot that works for them and then select the right radio button before submitting the form:

Here's an example of the HTML structure that we're aiming to build...

Summary

This chapter has covered usage of four HTML form elements: textboxes, selects, radio buttons, and, of course, labels.

Although these controls are basic, we've used this opportunity to dig much deeper into test-driven React. We've built controlled components, used defaultProps, and split our top-level component into a hierarchy of smaller components and plain JavaScript functions.

We've also gone much further with Jest. We extracted common test logic into modules, used nested describe blocks, and built assertions using the document.form property and CSS selectors.

In Chapter 3, Exploring Test Doubles, we'll discover how to get data into and out of our components using the fetch API.

Exercises

The Git tag for this section is chapter-2-exercises.

  • Add the ability to choose a stylist before choosing a time slot. This should be a dropdown that filters based on the service required, as not all stylists will be qualified to provide all services. You'll need to decide on a suitable data structure to hold this data. Modify availableTimeSlots to list which stylists are available at each time, and update the table to reflect which stylist has been chosen and their availability during the week.

Further learning

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Key benefits

  • Learn the TDD process using the React framework
  • Build complex, real-world applications with a pragmatic approach to TDD
  • Use Cucumber for acceptance and BDD testing, bringing TDD to the wider team

Description

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.

Who is this book for?

The target audience for this book is JavaScript developers who are looking to implement test-driven and behavior-driven approaches for their React applications.

What you will learn

  • Build test-driven applications using React 16.9+ and Jest
  • Build complete web applications using a variety of HTML input elements
  • Understand the different types of test double and when to apply them
  • Test-drive the Integration of libraries such as React Router, Redux, and Relay (GraphQL)
  • Learn when to be pragmatic and how to apply TDD shortcuts
  • Test-drive interaction with browser APIs including fetch and WebSocket
  • Use Cucumber.js and Puppeteer to build BDD-style acceptance tests for your applications
  • Build and test async Redux code using redux-saga and expect-redux
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Table of Contents

15 Chapters
First Steps with Test-Driven Development Chevron down icon Chevron up icon
First Steps with Test-Driven Development
Technical requirements
Creating a new React project from scratch
Displaying data with your first test
Refactoring your work
Writing great tests
Rendering lists and detail views
Summary
Exercises
Further learning
Test-driving Data Input with React Chevron down icon Chevron up icon
Test-driving Data Input with React
Extracting a test helper
Adding a form element
Accepting text input
Selecting from a dropdown
Making a choice from radio buttons
Summary
Exercises
Further learning
Exploring Test Doubles Chevron down icon Chevron up icon
Exploring Test Doubles
What is a test double?
Submitting forms using spies
Stubbing the fetch API
Extracting test helpers
Summary
Exercises
Further learning
Creating a User Interface Chevron down icon Chevron up icon
Creating a User Interface
Fetching data on load with useEffect
Using props within useEffect
Passing customer data through to AppointmentForm
Working with the shallow renderer
Building a new root component
Summary
Further learning
Humanizing Forms Chevron down icon Chevron up icon
Humanizing Forms
Performing client-side validation
Handling server errors
Indicating that the form has been submitted
Summary
Exercises
Further learning
Filtering and Searching Data Chevron down icon Chevron up icon
Filtering and Searching Data
Displaying tabular data fetched from an endpoint
Paging through a large data set
Filtering data
Adding table row actions
Summary
Exercises
Test-driving React Router Chevron down icon Chevron up icon
Test-driving React Router
General rules for test-driving React Router
Building a root component
Using the location query string to store component state
Summary
Exercises
Further learning
Test-driving Redux Chevron down icon Chevron up icon
Test-driving Redux
Prerequisites
Test-driving a Redux saga
Making asynchronous requests with sagas
Switching out component state for Redux state
Shifting workflow to Redux
Summary
Exercises
Further learning
Test-driving GraphQL Chevron down icon Chevron up icon
Test-driving GraphQL
Installing Relay
Testing the Relay environment
Building the GraphQL reducer
Building the CustomerHistory component
Summary
Exercises
Further learning
Building a Logo Interpreter Chevron down icon Chevron up icon
Building a Logo Interpreter
Studying the Spec Logo user interface
Undoing and redoing user actions in Redux
Saving to LocalStorage via Redux middleware
Changing keyboard focus
Summary
Further learning
Adding Animation Chevron down icon Chevron up icon
Adding Animation
Isolating components for animation
Animating with requestAnimationFrame
Summary
Exercises
Working with WebSockets Chevron down icon Chevron up icon
Working with WebSockets
Designing a WebSocket interaction
Test-driving a WebSocket connection
Streaming events with redux-saga
Updating the app
Summary
Exercises
Further learning
Writing Your First Acceptance Test Chevron down icon Chevron up icon
Writing Your First Acceptance Test
Integrating Cucumber and Puppeteer into your code base
Writing your first Cucumber test
Using data tables to perform setup
Summary
Adding Features Guided by Acceptance Tests Chevron down icon Chevron up icon
Adding Features Guided by Acceptance Tests
Adding acceptance tests for a dialog box
Fixing acceptance tests by test-driving production code
Adding better wait support
Exercises
Summary
Understanding TDD in the Wider Testing Landscape Chevron down icon Chevron up icon
Understanding TDD in the Wider Testing Landscape
Test-driven development as a testing technique
Manual testing
Automated testing
Not testing at all
Summary
Further learning

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窪田　昌二 Aug 14, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
このreact本は、reactを知りつくした著者がすごく丁寧にreactの開発手順を書いてくれていると思いました。まだ途中ですが、十分私には役に立っています。もっとも感動したのは、redux-sagaです。最初、全然分からなくて、何故こんなややこしいことするのだろう。非同期でなくてもいいから簡単な方法でまず書いて欲しいと思っていました。しかし、ソースコードを見て段々分かってくるとこれが一番簡単な方法であることが分かりました。redux-sagaについてはネットでもあまり情報がありませんのでこの本のソースコードだけが頼りでした。今はreactがより好きになりました。著者の方、ありがとうございます！
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Alexandre PINON Jan 12, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book with all steps covered. Excellent even for absolute TDD beginners.Also a good book to discover on how to use react associated libraries (redux, graphql, react router).Recommended to learn testing react.May need to supply with some research to better understand some of the libraries used.The best part: exercices and solutions on github
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Valentyn Solovyov Jan 26, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Being a seasoned react developer I found a lot of new information about testing react applications in all flavors.
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Amazon Customer Apr 12, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
good
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manandearth Aug 12, 2019
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I find Daniel Irvine's approach sound and helpful from the first page.Spending some few months building apps in React and Redux, I felt like I was writing Javascript in the wild ( I saw this term somewhere, I don't remember where...) With the clear steps described in Mastering React Test-Driven Development, I know that I am in good hands. The methods are clearly explained and reasoned.And the good practices introduced ( practically ) are most useful regardless of language or framework.Absolutely fantastic work by a good and experienced developer.
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Daniel Irvine
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Daniel Irvine is a UK-based software consultant. He helps businesses simplify their existing codebases and assists dev teams in improving the quality of their software using eXtreme programming (XP) practices. He has been coaching developers for many years and co-founded the Queer Code London meetup.
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact [email protected] with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at [email protected] using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on [email protected] with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on [email protected] within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on [email protected] who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on [email protected] within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
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