hatelove · October 10, 2022 20:59
diff --git a/babel with jest b/babel with jest
 yarn add --dev babel-jest @babel/core @babel/preset-env
diff --git a/babel.config.js b/babel.config.js
 module.exports = {
    presets: [
        ['@babel/preset-env', {targets: {node: 'current'}}],
    ],
 };
diff --git a/calculator.test.js b/calculator.test.js
 class Calculator {
    sum(first, second) {
        return first+second;
    }
 }

 describe('calculator add', function () {
    it('positive add positive', () => {
        let calculator = new Calculator();
        let sum = calculator.sum(1,2);
        expect(sum).toBe(3);
    });
 });
diff --git a/install jest by yarn b/install jest by yarn
 yarn add --dev jest
	module.exports = {
	presets: [
	['@babel/preset-env', {targets: {node: 'current'}}],
	],
	};
	class Calculator {
	sum(first, second) {
	return first+second;
	}
	}

	describe('calculator add', function () {
	it('positive add positive', () => {
	let calculator = new Calculator();
	let sum = calculator.sum(1,2);
	expect(sum).toBe(3);
	});
	});