I'm new to Node.js and testing. What is the correct setup to avoid getting the following error in the terminal when running tests with JestJS?
Cannot read property 'addEventListener' of null
The test for the sum function passes as soon as I comment out adding the event listener in the app.js file. I'm not even sure why is this line as well as the console.log('Not part...') even executed by Jest since I only export the sum function.
The contents of my index.html file:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<button id="button">JavaScript</button>
<script src="./app.js"></script>
</body>
</html>
The contents of my app.js file:
function sum(a, b) {
return a + b;
}
console.log('Not part of module.exports but still appearing in terminal, why?');
var button = document.getElementById('button');
button.addEventListener('click', function(e) {
console.log('button was clicked');
});
module.exports = {
sum
};
The contents of my app.test.js file:
var { sum } = require('./app');
describe('sum', () => {
test('adds numbers', () => {
expect(sum(1, 2)).toBe(3);
});
});
My package.json:
"scripts": {
"test": "jest --coverage",
"test:watch": "npm run test -- --watch"
},
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