I use Jest and dom testing library and I DON’T USE REACT.
Also I use webpack in my project. I keep on geting the same problem:
expect(element).toBeInTheDocument()
element could not be found in the document
How can I test if a button is in the document? And how can I correctly test the modules of the project if I use static HTML with no scripts? Should I manually add the scripts? I do it for the first time, please help me
My test file:
import { getByRole } from '@testing-library/dom';
import '@testing-library/jest-dom';
import '@testing-library/jest-dom/extend-expect';
function getExampleDOM() {
const div = document.createElement('div');
div.innerHTML = `
<div class="screen">
<h1 class="game__title">GAME 2048</h1>
<button type="button" class="btn btn-start">Start</button>
</div>
<div class="screen">
<h2 class="game__title">Choose board size</h2>
<ul class="size-list">
<li>
<button type="button" class="btn btn-size" data-size="3">3 x 3</button>
</li>
<li>
<button type="button" class="btn btn-size" data-size="4">4 x 4 (classic)</button>
</li>
<li>
<button type="button" class="btn btn-size" data-size="5">5 x 5</button>
</li>
</ul>
</div>
<div class="game__wrapper">
<h2 class="game__score-title">Your score:<span class="game__score">0</span></h2>
<div class="game-board"></div>
</div>
`;
return div;
}
describe('startGame', () => {
test('renders all necessary elements', () => {
const container = getExampleDOM();
const startBtn = getByRole(container, 'button', { name: /start/i });
expect(startBtn).toBeInTheDocument();
});
});
my package.json:
{
"name": "2048",
"version": "1.0.0",
"repository": {
"url": "https://github.com/EkaterinaMuz/GAME2048.git"
},
"description": "",
"scripts": {
"test": "jest --w",
"build": "webpack --mode development",
"start": "webpack-dev-server --mode development --open",
"predeploy": "npm run build",
"deploy": "gh-pages -d dist"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"@babel/eslint-parser": "^7.21.8",
"@babel/polyfill": "^7.12.1",
"@babel/preset-env": "^7.21.5",
"@testing-library/user-event": "^14.4.3",
"babel-loader": "^9.1.2",
"clean-webpack-plugin": "^4.0.0",
"css-loader": "^6.7.4",
"eslint": "^8.2.0",
"eslint-config-airbnb-base": "^15.0.0",
"eslint-config-prettier": "^8.8.0",
"eslint-plugin-import": "^2.27.5",
"eslint-plugin-jest-dom": "^4.0.3",
"eslint-plugin-prettier": "^4.2.1",
"eslint-plugin-testing-library": "^5.11.0",
"eslint-webpack-plugin": "^4.0.1",
"file-loader": "^6.2.0",
"gh-pages": "^5.0.0",
"html-webpack-plugin": "^5.5.1",
"jest": "^29.5.0",
"jest-webpack": "^0.5.1",
"style-loader": "^3.3.3",
"webpack": "^5.83.1",
"webpack-cli": "^5.1.1",
"webpack-dev-server": "^4.15.0"
},
"dependencies": {
"@testing-library/jest-dom": "^5.16.5",
"hammerjs": "^2.0.8",
"jest-environment-jsdom": "^29.5.0"
}
}
Also I added Jest config
const config = {
testEnvironment: 'jsdom',
testEnvironmentOptions: {
html: '<html lang="zh-cmn-Hant"></html>',
url: 'https://jestjs.io/',
userAgent: 'Agent/007',
},
};
module.exports = config;
And also I have webpack in the project:
const path = require('path');
const HTMLWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
// const ESLintPlugin = require('eslint-webpack-plugin');
module.exports = {
mode: 'development',
context: path.resolve(__dirname, 'src'),
entry: ['@babel/polyfill', './scripts/index.js'],
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js',
assetModuleFilename: 'assets/[name][ext][query]',
},
devServer: {
port: 3000,
},
plugins: [
new HTMLWebpackPlugin({
template: './index.html',
}),
new CleanWebpackPlugin(),
// new ESLintPlugin({
// fix: true,
// }),
],
module: {
rules: [
{
test: /.css$/,
use: ['style-loader', 'css-loader'],
},
// {
// test: /.(png|jpg)$/,
// type: 'asset/resource',
// },
{
test: /.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
options: {
presets: ['@babel/preset-env'],
},
},
},
],
},
};
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