初始化

mkdir leetcode && cd leetcode
# 初始化
cnpm init -y
#依赖安装
cnpm i jest @types/jest ts-jest typescript -D

目录结构

截屏2021-03-29 上午11.02.53.png

Package.js

{
  "name": "leetcode",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "npx jest",
    "coverage": "npx jest --coverage" // 生成测试报告
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/jest": "^26.0.22",
    "jest": "^26.6.3",
    "ts-jest": "^26.5.4",
    "typescript": "^4.2.3"
  }
}

jest.config.js

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

测试

源文件

// src/1/index.ts
/**
 * @param {number[]} nums
 * @param {number} target
 * @return {number[]}
 */
function twoSum(nums: number[], target: number) {
  let map = new Map();
  for (let i = 0; i < nums.length; i++) {
    let temp = target - nums[i];
    if (map.has(temp)) {
      return [map.get(temp), i];
    } else {
      map.set(nums[i], i);
    }
  }
  return [];
}
export default twoSum;
// src/1/index.spec.ts
import twoSum from "./index";
describe.each([
  [[2, 7, 11, 15], 9, [0, 1]],
  [[3, 2, 4], 6, [1, 2]],
  [[3, 3], 6, [0, 1]],
])("两数之和", (arr, target, expected) => {
  test(`${arr} + ${target} => ${expected}`, () => {
    expect(twoSum(arr, target)).toStrictEqual(expected);
  });
});