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my first commit
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‎.gitignore‎

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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# testing
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/coverage
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# production
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/build
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# misc
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.DS_Store
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*

‎README.md‎

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# [React testing tutorial using Jest](https://reactgo.com/react-testing-tutorial-jest/)
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## Available Scripts
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In the project directory, you can run:
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### `npm test`
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Launches the test runner in the interactive watch mode.<br>
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See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
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### `npm run test:update`
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It is used to update the snapshots
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### `npm run test:coverage`
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it is used to generate codecoverage reports

‎package-lock.json‎

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‎package.json‎

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{
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"name": "react-testing",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"react": "^16.7.0",
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"react-dom": "^16.7.0",
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"react-scripts": "2.1.3"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"test:update": "react-scripts test --updateSnapshot",
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"test:coverage": "react-scripts test --coverage",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": [
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">0.2%",
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"not dead",
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"not ie <= 11",
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"not op_mini all"
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],
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"devDependencies": {
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"react-test-renderer": "^16.7.0"
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}
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}

‎public/favicon.ico‎

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‎public/index.html‎

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

‎public/manifest.json‎

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{
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"short_name": "React App",
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"name": "Create React App Sample",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}

‎src/App.css‎

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.App {
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text-align: center;
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}
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.App-logo {
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animation: App-logo-spin infinite 20s linear;
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height: 40vmin;
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}
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.App-header {
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background-color: #282c34;
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min-height: 100vh;
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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font-size: calc(10px + 2vmin);
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color: white;
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}
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.App-link {
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color: #61dafb;
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}
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@keyframes App-logo-spin {
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from {
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transform: rotate(0deg);
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}
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to {
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transform: rotate(360deg);
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}
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}

‎src/App.js‎

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import React, { Component } from 'react';
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class App extends Component {
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state = {
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isActive: false
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}
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handleClick = () => {
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this.setState({ isActive: !this.state.isActive })
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}
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render() {
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return (
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<div className="App">
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<button onClick={this.handleClick}>
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{this.state.isActive ? "Hide" : "Show"}
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</button>
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</div>
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);
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}
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}
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export default App;

‎src/__tests__/App.test.js‎

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import React from 'react';
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import App from '../App';
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import { create, update } from 'react-test-renderer'
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describe('My first snapshot test', () => {
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test('testing app button', () => {
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let tree = create(<App />)
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expect(tree.toJSON()).toMatchSnapshot();
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})
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})
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describe("Changing our button name to Hide", () => {
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test('toggle the button', () => {
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let tree = create(<App />);
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let instance = tree.getInstance();
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expect(instance.state.isActive).toBe(false)
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// changing the state
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instance.handleClick();
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expect(instance.state.isActive).toBe(true);
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expect(tree.toJSON()).toMatchSnapshot()
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})
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})

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