单元测试UI

cnpm install -g --save mocha   

cnpm install  -g --save chai  

cnpm install -g --save istanbul

const {should,expect,assert} = require('chai');
const {add,mul} = require('./math')
describe("#math",()=>{
    describe('add',()=>{
        it('shoule return 5 when 2+3',()=>{
            expect(add(2,3),5);
        });
        it('shoule return 5 when 2+3',()=>{
            expect(add(2,-3),-1);
        })
    })
    describe('mul',()=>{
        it('shoule return 5 when 2*3',()=>{
            expect(add(2,3),6);
        });
        it('shoule return 5 when 2*3',()=>{
            expect(add(2,-3),-6);
        })
    })
})

这里很重要
"scripts": {
  "test": "mocha test/mocha.js",
  "cover": "istanbul cover ./node_modules/mocha/bin/_mocha test/mocha.js"
},