Fin P5Ch4 - Enzyme

package.json

@@ -3,21 +3,30 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
+    "lodash.shuffle": "^4.2.0",
+    "prop-types": "^15.6.0",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",
-    "react-scripts": "1.0.14"
+    "react-scripts": "^1.0.17"
   },
   "scripts": {
     "start": "react-scripts start",
     "build": "react-scripts build",
-    "test": "react-scripts test --env=jsdom",
+    "test": "react-scripts test",
     "eject": "react-scripts eject"
   },
   "devDependencies": {
+    "chai": "^4.1.2",
+    "chai-enzyme": "^1.0.0-beta.0",
+    "chai-jest-diff": "^1.0.1",
+    "dirty-chai": "^2.0.1",
+    "enzyme": "^3.2.0",
+    "enzyme-adapter-react-16": "^1.1.0",
     "eslint-config-prettier": "^2.6.0",
     "eslint-config-react-app": "^2.0.1",
     "eslint-plugin-prettier": "^2.3.1",
-    "prettier": "^1.7.4"
+    "prettier": "^1.7.4",
+    "react-test-renderer": "^16.2.0"
   },
   "prettier": {
     "semi": false,

public/index.html

@@ -1,16 +1,17 @@
 <!doctype html>
 <html lang="en">
-  <head>
-    <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
-    <meta name="theme-color" content="#000000">
-    <!--
+
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+  <meta name="theme-color" content="#000000">
+  <!--
       manifest.json provides metadata used when your web app is added to the
       homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
     -->
-    <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
-    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
-    <!--
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
+  <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
+  <!--
       Notice the use of %PUBLIC_URL% in the tags above.
       It will be replaced with the URL of the `public` folder during the build.
       Only files inside the `public` folder can be referenced from the HTML.
@@ -19,14 +20,15 @@
       work correctly both with client-side routing and a non-root public URL.
       Learn how to configure a non-root public URL by running `npm run build`.
     -->
-    <title>React App</title>
-  </head>
-  <body>
-    <noscript>
-      You need to enable JavaScript to run this app.
-    </noscript>
-    <div id="root"></div>
-    <!--
+  <title>React Memory</title>
+</head>
+
+<body>
+  <noscript>
+    You need to enable JavaScript to run this app.
+  </noscript>
+  <div id="root"></div>
+  <!--
       This HTML file is a template.
       If you open it directly in the browser, you will see an empty page.
 
@@ -36,5 +38,6 @@
       To begin the development, run `npm start` or `yarn start`.
       To create a production bundle, use `npm run build` or `yarn build`.
     -->
-  </body>
+</body>
+
 </html>

src/App.css

@@ -1,32 +1,7 @@
-.App {
-  text-align: center;
-}
-
-.App-logo {
-  animation: App-logo-spin infinite 20s linear;
-  height: 80px;
-}
-
-.App-header {
-  background-color: #222;
-  height: 150px;
-  padding: 20px;
-  color: white;
-}
-
-.App-title {
-  font-size: 1.5em;
-}
-
-.App-intro {
-  font-size: large;
-}
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
+.memory {
+  display: flex;
+  flex-wrap: wrap;
+  width: 300px;
+  margin: auto;
+  user-select: none;
 }

src/App.js

@@ -1,16 +1,110 @@
 import React, { Component } from 'react'
-import logo from './logo.svg'
+import shuffle from 'lodash.shuffle'
+
 import './App.css'
 
+import Card from './Card'
+import GuessCount from './GuessCount'
+import HallOfFame, { FAKE_HOF } from './HallOfFame'
+import HighScoreInput from './HighScoreInput'
+
+const SIDE = 6
+const SYMBOLS = '😀🎉💖🎩🐶🐱🦄🐬🌍🌛🌞💫🍎🍌🍓🍐🍟🍿'
+const VISUAL_PAUSE_MSECS = 750
+
 class App extends Component {
+  state = {
+    cards: this.generateCards(),
+    currentPair: [],
+    guesses: 0,
+    hallOfFame: null,
+    matchedCardIndices: [],
+  }
+
+  // Arrow fx for binding
+  displayHallOfFame = hallOfFame => {
+    this.setState({ hallOfFame })
+  }
+
+  generateCards() {
+    const result = []
+    const size = SIDE * SIDE
+    const candidates = shuffle(SYMBOLS)
+    while (result.length < size) {
+      const card = candidates.pop()
+      result.push(card, card)
+    }
+    return shuffle(result)
+  }
+
+  getFeedbackForCard(index) {
+    const { currentPair, matchedCardIndices } = this.state
+    const indexMatched = matchedCardIndices.includes(index)
+
+    if (currentPair.length < 2) {
+      return indexMatched || index === currentPair[0] ? 'visible' : 'hidden'
+    }
+
+    if (currentPair.includes(index)) {
+      return indexMatched ? 'justMatched' : 'justMismatched'
+    }
+
+    return indexMatched ? 'visible' : 'hidden'
+  }
+
+  // Arrow fx for binding
+  handleCardClick = index => {
+    const { currentPair } = this.state
+
+    if (currentPair.length === 2) {
+      return
+    }
+
+    if (currentPair.length === 0) {
+      this.setState({ currentPair: [index] })
+      return
+    }
+
+    this.handleNewPairClosedBy(index)
+  }
+
+  handleNewPairClosedBy(index) {
+    const { cards, currentPair, guesses, matchedCardIndices } = this.state
+
+    const newPair = [currentPair[0], index]
+    const newGuesses = guesses + 1
+    const matched = cards[newPair[0]] === cards[newPair[1]]
+    this.setState({ currentPair: newPair, guesses: newGuesses })
+    if (matched) {
+      this.setState({ matchedCardIndices: [...matchedCardIndices, ...newPair] })
+    }
+    setTimeout(() => this.setState({ currentPair: [] }), VISUAL_PAUSE_MSECS)
+  }
+
   render() {
+    const { cards, guesses, hallOfFame, matchedCardIndices } = this.state
+    const won = matchedCardIndices.length === cards.length
     return (
-      <div className="App">
-        <header className="App-header">
-          <img src={logo} className="App-logo" alt="logo" />
-          <h1 className="App-title">Welcome to React</h1>
-        </header>
-        <p className="App-intro">React c’est cool !</p>
+      <div className="memory">
+        <GuessCount guesses={guesses} />
+        {cards.map((card, index) => (
+          <Card
+            card={card}
+            feedback={this.getFeedbackForCard(index)}
+            index={index}
+            key={index}
+            onClick={this.handleCardClick}
+          />
+        ))}
+        {won &&
+          (hallOfFame ? (
+            <HallOfFame entries={hallOfFame} />
+          ) : (
+            <HighScoreInput
+              guesses={guesses}
+              onStored={this.displayHallOfFame}
+            />
+          ))}
       </div>
     )
   }

src/App.spec.js

@@ -0,0 +1,23 @@
+import { expect } from 'chai'
+import React from 'react'
+import { shallow } from 'enzyme'
+
+import App from './App'
+import GuessCount from './GuessCount'
+
+describe('<App/>', () => {
+  it('renders without crashing', () => {
+    const wrapper = shallow(<App />)
+  })
+
+  it('contains a zero-guess counter', () => {
+    const wrapper = shallow(<App />)
+
+    expect(wrapper).to.contain(<GuessCount guesses={0} />)
+  })
+
+  it('has 36 cards', () => {
+    const wrapper = shallow(<App />)
+    expect(wrapper.find('Card')).to.have.length(36)
+  })
+})

src/App.test.js

@@ -1,8 +0,0 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
-import App from './App';
-
-it('renders without crashing', () => {
-  const div = document.createElement('div');
-  ReactDOM.render(<App />, div);
-});

src/Card.css

@@ -0,0 +1,28 @@
+.memory > .card {
+  font-size: 2em;
+  flex: 1 1 calc(100% / 6 - 0.4em);
+  outline: 0.08em solid silver;
+  margin: 0.2em;
+  display: flex;
+  cursor: default;
+}
+
+.memory > .card.hidden {
+  background: silver;
+}
+
+.memory > .card.justMatched,
+.memory > .card.justMismatched {
+  outline: 0.1em solid green;
+}
+.memory > .card.justMismatched {
+  outline-color: red;
+}
+
+.memory > .card.visible {
+  cursor: not-allowed;
+}
+
+.memory > .card > .symbol {
+  margin: auto;
+}

src/Card.js

@@ -0,0 +1,28 @@
+import PropTypes from 'prop-types'
+import React from 'react'
+
+import './Card.css'
+
+const HIDDEN_SYMBOL = '❓'
+
+const Card = ({ card, feedback, index, onClick }) => (
+  <div className={`card ${feedback}`} onClick={() => onClick(index)}>
+    <span className="symbol">
+      {feedback === 'hidden' ? HIDDEN_SYMBOL : card}
+    </span>
+  </div>
+)
+
+Card.propTypes = {
+  card: PropTypes.string.isRequired,
+  feedback: PropTypes.oneOf([
+    'hidden',
+    'justMatched',
+    'justMismatched',
+    'visible',
+  ]).isRequired,
+  index: PropTypes.number.isRequired,
+  onClick: PropTypes.func.isRequired,
+}
+
+export default Card

src/GuessCount.css

@@ -0,0 +1,7 @@
+.memory > .guesses {
+  font-size: 1em;
+  width: calc(100% - 0.4em);
+  margin: 0.2em;
+  text-align: right;
+  font-family: Menlo, Monaco, Consolas, Inconsolata, 'Courier New', monospace;
+}

src/GuessCount.js

@@ -0,0 +1,12 @@
+import PropTypes from 'prop-types'
+import React from 'react'
+
+import './GuessCount.css'
+
+const GuessCount = ({ guesses }) => <div className="guesses">{guesses}</div>
+
+GuessCount.propTypes = {
+  guesses: PropTypes.number.isRequired,
+}
+
+export default GuessCount

src/HallOfFame.css

@@ -0,0 +1,14 @@
+.hallOfFame {
+  width: 100%;
+  border-collapse: collapse;
+}
+
+.hallOfFame .date,
+.hallOfFame .guesses {
+  width: 20%;
+  text-align: center;
+}
+
+.hallOfFame tr:nth-child(even) {
+  background: #eee;
+}

src/HallOfFame.js

@@ -0,0 +1,65 @@
+import PropTypes from 'prop-types'
+import React from 'react'
+
+import './HallOfFame.css'
+
+const HallOfFame = ({ entries }) => (
+  <table className="hallOfFame">
+    <tbody>
+      {entries.map(({ date, guesses, id, player }) => (
+        <tr key={id}>
+          <td className="date">{date}</td>
+          <td className="guesses">{guesses}</td>
+          <td className="player">{player}</td>
+        </tr>
+      ))}
+    </tbody>
+  </table>
+)
+
+HallOfFame.propTypes = {
+  entries: PropTypes.arrayOf(
+    PropTypes.shape({
+      date: PropTypes.string.isRequired,
+      guesses: PropTypes.number.isRequired,
+      id: PropTypes.number.isRequired,
+      player: PropTypes.string.isRequired,
+    })
+  ).isRequired,
+}
+
+export default HallOfFame
+
+// == Internal helpers ==============================================
+
+export const FAKE_HOF = [
+  { id: 3, guesses: 18, date: '10/10/2017', player: 'Jane' },
+  { id: 2, guesses: 23, date: '11/10/2017', player: 'Kevin' },
+  { id: 1, guesses: 31, date: '06/10/2017', player: 'Louisa' },
+  { id: 0, guesses: 48, date: '14/10/2017', player: 'Marc' },
+]
+
+const HOF_KEY = '::Memory::HallofFame'
+const HOF_MAX_SIZE = 10
+
+export function saveHOFEntry(entry, onStored) {
+  entry.date = new Date().toLocaleDateString()
+  entry.id = Date.now()
+
+  const entries = JSON.parse(localStorage.getItem(HOF_KEY) || '[]')
+  const insertionPoint = entries.findIndex(
+    ({ guesses }) => guesses >= entry.guesses
+  )
+
+  if (insertionPoint === -1) {
+    entries.push(entry)
+  } else {
+    entries.splice(insertionPoint, 0, entry)
+  }
+  if (entries.length > HOF_MAX_SIZE) {
+    entries.splice(HOF_MAX_SIZE, entries.length)
+  }
+
+  localStorage.setItem(HOF_KEY, JSON.stringify(entries))
+  onStored(entries)
+}

src/HighScoreInput.css

@@ -0,0 +1,11 @@
+.highScoreInput {
+  font-size: 1em;
+  width: calc(100% - 0.4em);
+  margin: 0.2em;
+}
+.highScoreInput input {
+  display: block;
+  width: 100%;
+  margin-bottom: 0.2em;
+  font-family: Menlo, Monaco, Consolas, Inconsolata, 'Courier New', monospace;
+}

src/HighScoreInput.js

@@ -0,0 +1,48 @@
+import PropTypes from 'prop-types'
+import React, { Component } from 'react'
+
+import './HighScoreInput.css'
+
+import { saveHOFEntry } from './HallOfFame'
+
+class HighScoreInput extends Component {
+  state = { winner: '' }
+
+  // Arrow fx for binding
+  handleWinnerUpdate = event => {
+    this.setState({ winner: event.target.value.toUpperCase() })
+  }
+
+  // Arrow fx for binding
+  persistWinner = event => {
+    event.preventDefault()
+    const newEntry = { guesses: this.props.guesses, player: this.state.winner }
+    saveHOFEntry(newEntry, this.props.onStored)
+  }
+
+  render() {
+    return (
+      <form className="highScoreInput" onSubmit={this.persistWinner}>
+        <p>
+          <label>
+            Bravo ! Entre ton prénom :
+            <input
+              autoComplete="given-name"
+              type="text"
+              onChange={this.handleWinnerUpdate}
+              value={this.state.winner}
+            />
+          </label>
+          <button type="submit">J’ai gagné !</button>
+        </p>
+      </form>
+    )
+  }
+}
+
+HighScoreInput.propTypes = {
+  guesses: PropTypes.number.isRequired,
+  onStored: PropTypes.func.isRequired,
+}
+
+export default HighScoreInput

src/index.css

@@ -1,5 +0,0 @@
-body {
-  margin: 0;
-  padding: 0;
-  font-family: sans-serif;
-}

src/index.js

@@ -1,8 +1,7 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
-import './index.css';
-import App from './App';
-import registerServiceWorker from './registerServiceWorker';
+import React from 'react'
+import ReactDOM from 'react-dom'
+import App from './App'
+import registerServiceWorker from './registerServiceWorker'
 
-ReactDOM.render(<App />, document.getElementById('root'));
-registerServiceWorker();
+ReactDOM.render(<App />, document.getElementById('root'))
+registerServiceWorker()

src/logo.svg

@@ -1,7 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
-    <g fill="#61DAFB">
-        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
-        <circle cx="420.9" cy="296.5" r="45.7"/>
-        <path d="M520.5 78.1z"/>
-    </g>
-</svg>

src/setupTests.js

@@ -0,0 +1,13 @@
+import Adapter from 'enzyme-adapter-react-16'
+import chai from 'chai'
+import { configure as configureEnzyme } from 'enzyme'
+import createChaiEnzyme from 'chai-enzyme'
+import createChaiJestDiff from 'chai-jest-diff'
+import dirtyChai from 'dirty-chai'
+
+chai
+  .use(dirtyChai)
+  .use(createChaiJestDiff())
+  .use(createChaiEnzyme())
+
+configureEnzyme({ adapter: new Adapter() })