安装

npm install --save-dev @types/jest

npm install --save-dev ts-jest

配置

tsconfig.json

{"compilerOptions": {"types": ["jest"]}
}

jest.config.js

module.exports = {preset: 'ts-jest',testEnvironment: 'node',
};

使用

// add.js
function add(a, b) {return a + b;
}module.exports = add;

测试文件

// add.test.js
const add = require('./add');describe('add function', () => {let result;beforeEach(() => {result = add(1, 2);});test('adds 1 + 2 to equal 3', () => {expect(result).toBe(3);});
});