React-native单元测试框架-Jest

Jest

安装

使用命令npm install jest-cli --save-dev来安装Jest命令行:

localhost:TesterHome wuxian$ npm install jest-cli --save-dev
jest-cli@0.7.1 node_modules/jest-cli
├── jasmine-pit@2.0.2
├── object-assign@4.0.1
├── graceful-fs@4.1.2
├── through@2.3.8
├── resolve@1.1.6
├── diff@2.2.0
├── optimist@0.6.1 (wordwrap@0.0.3, minimist@0.0.10)
├── json-stable-stringify@1.0.0 (jsonify@0.0.0)
├── mkdirp@0.5.1 (minimist@0.0.8)
├── which@1.2.0 (is-absolute@0.1.7)
├── worker-farm@1.3.1 (xtend@4.0.1, errno@0.1.4)
├── node-haste@1.2.8 (esprima-fb@4001.1001.0-dev-harmony-fb)
├── lodash.template@3.6.2 (lodash._basetostring@3.0.1, lodash._reinterpolate@3.0.0, lodash._basecopy@3.0.1, lodash._basevalues@3.0.0, lodash.restparam@3.6.1, lodash.templatesettings@3.1.0, lodash.escape@3.0.0, lodash._isiterateecall@3.0.9, lodash.keys@3.1.2)
├── sane@1.3.0 (watch@0.10.0, minimist@1.2.0, exec-sh@0.2.0, walker@1.0.7, minimatch@0.2.14, fb-watchman@1.6.0)
├── cover@0.2.9 (which@1.0.9, underscore@1.2.4, underscore.string@2.0.0, cli-table@0.0.2)
├── istanbul@0.3.22 (abbrev@1.0.7, wordwrap@1.0.0, nopt@3.0.4, async@1.5.0, once@1.3.2, esprima@2.5.0, escodegen@1.7.0, supports-color@3.1.2, fileset@0.2.1, js-yaml@3.4.3, handlebars@4.0.4)
└── jsdom@7.0.2 (acorn-globals@1.0.9, webidl-conversions@2.0.0, xml-name-validator@2.0.1, browser-request@0.3.3, abab@1.0.0, cssom@0.3.0, symbol-tree@3.1.3, nwmatcher@1.3.6, tough-cookie@2.2.0, parse5@1.5.0, acorn@2.5.2, cssstyle@0.2.30, whatwg-url-compat@0.6.5, escodegen@1.7.0, htmlparser2@3.8.3, request@2.65.0)

单元测试文件夹

Jest默认执行__tests__(左右各两个下划线)文件下的单测case，所以在你的根目录下创建该目录:

编写case

目标文件为sum.js:

// sum.js
function sum(value1, value2) {
  return value1 + value2;
}
module.exports = sum;

在__tests__目录下编写单元测试类sum-test.js:

// __tests__/sum-test.js
jest.dontMock('../sum');

describe('sum', function() {
 it('adds 1 + 2 to equal 3', function() {
   var sum = require('../sum');
   expect(sum(1, 2)).toBe(3);
 });
});

执行单测

命令为npm test:

localhost:TesterHome wuxian$ npm test

> TesterHome@0.0.1 test /Users/wuxian/Documents/sourcecode/self/react-native/TesterHome
> jest

Using Jest CLI v0.7.1
 PASS  __tests__/sum-test.js (0.018s)
1 test passed (1 total in 1 test suite, run time 0.555s)