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环境搭建

初始化项目生成package.json

npm init -y

安装jest

yarn add --dev jest

所有代码采用最新ES6语法编写,所以需要使用babel

yarn add --dev @babel/core @babel/preset-env babel-core babel-preset-env babel-jest regenerator-runtime

编辑package.json

{
  "scripts": {
    "test": "jest"
  }
}

编辑.babelrc

{
  "presets": ["env"]
}

创建js文件

// sum.js
function sum(a, b) {
  return a + b;
}
export default sum;
// sum.test.js
import sum from '../code/sum';

test('adds 1 + 2 to equal 3', () => {
	expect(sum(1, 2)).toBe(3);
});

启动测试

yarn test

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