???????????????校??????????????????????????????????妫�?????????????????????????????????????????????????????????????????????????
??????????????????????????????????椋�?????????????些未??????????????????????尾?????些???????????????????????????????????懈??????????

???????????????y???????????????????????????????????位??????????????????????????????????????????????斜???校?????????????????唯????????????????????械???????????????????????????????????????????????????????????????????????????????????????????????????????????????????椋�???????????????????????????????????????
???????????????
????Istanbul??JavaScript??????????????????????????????????????????Istanbul????????????????????????????????位???????????????????????????????????????????械??????????????????????Istanbul?????test runner??????mocha?????????????????????????????妾�
????Mocha?????????????????胁????????????Jasmine??Karma??Ava????JUnit??????????mocha????????????descibe??it????????????test suit?????????????椤ocha?????????assert?????????????????斜??????????????????chai???????????????nodejs????assert??椤�
???????????????校???????些????????????????io????????????????????????????????????????sinon??????????????Sinon???????Test Double?????????????????????????????些???????????婊�???????????????????????????????????????????????????????????????????????????????????小?
?????nodejs??????貌??????
????1 ??????????????
????mocha??istanbul?????????????????????????????
npm install --save-dev mocha chai sinon istanbul
???????????????package.json?????scripts?锟�??????胁???????????????????
??{
????  ...
????  "scripts":{
????    "coverage": "istanbul cover _mocha -- -R spec --timeout 5000 --recursive"??
????    "coverage:check": "istanbul check-coverage"??
????  }
????  ...
????}
????????npm run coverage??npm run coverage:check???????????????妫�????????????妫�?????????????????????????

????2 ????Istanbul
????istanbul??????胁????????????????????????????????????????????yaml?????.istanbul.yml????????谩????????些???????????
????instrumentation:
????  root: .   # ??械????
????  extensions:
????    - .js   # ??榇�??????????????
????  excludes: ['**/benchmark/**']
????  ... ...
????reporting:
????  print: summary
????  reports: [lcov?? text?? html?? text-summary] # ??????????
????  dir: ./coverage   # ??????姹�?????
????  watermarks:       # ??????????????????貌?????
????    statements: [80?? 95]
????    ... ...
????check:
????  global:
????    statements: 100
????    branches: 100
????    lines: 100
????    functions: 100
???????check???????????????????????????????????????????????????????????涓�????????????????懈????????????????????????瓒�?????????械???????????????????????????????????伞?
??????写???????
???????????????械???????????????????????写???????????????????????????????????写???????????????????????????????????????????????????????
????1 ??渭???mocha???????
????????chai????expect??????????????BDD??????写?????????????????????????????
??var chai = require('chai')
????chai.should()
????var expect = chai.expect
????var assert = chai.assert
????describe('basic test'?? function () {
????  describe('simple'?? function () {
????    it('data check'?? function () {
????      var data = { name: "test" }
????      assert.isNotNull(data?? 'data should not be null')
????      expect(data).to.be.an('object')
????      expect(data).to.have.all.keys(['name'])
????      expect(data).to.deep.include({name: 'test'});
????    });
????  });
????});
????2 ??Sinon????????写
??... ??? ...
????var sinon = require('sinon')
????var fs = require('fs')
????describe('sinon'?? function () {
????  it("should mock readFile"?? function(done){
????    sinon.stub(fs?? 'readFile').callsFake(function (path?? callback) { callback(new Error('read error')) })
????    fs.readFile("any file path"?? function(err??data){
????      assert.isNotNull(err)
????      done()
????    })
????    assert(fs.readFile.calledOnce)
????  });
????});
??????mocha???????校???????????????????????????????????it?????????done??????????mocha??????????????????????????????????????????????????
????Sinon????????????spy??stub??mock?????校?
????Spy?? ???????????????????????????浜�???????
????Stub?? ??????????????????????????????????????????stubbed??????????魏???????????????
????Mock?? ??????spies??stubs????婊�?????????????????
????????????????????????????????????sinon????梅????????????????????????????
????????????
??????????写??????????????????????github???????贸??????????travis????????????????????????coverall?????????????????????????????????????badges??
??????????梅?????????慰????????????coveralls?????????邪????????npm i -D coveralls?????????package.json??????istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js
?????????nodejs???.travis.yml???????锟�?
??language: node_js
????node_js:
????  - "7.6.0"
????install:
????  - npm install
????script:
????  - npm test
????after_script:
????  - npm run coverall
?????????婕�??????????????慰??????????????????????????????????婕�?????????
????https://github.com/liuwill/find-ip-location