karma和Jasmine自动化单元测试

karma的安装

1.首先初始化一个项目：npm init
2.安装karma：npm install karma --save-dev
3.安装一些包：npm install karma-jasmine karma-chrome-launcher jasmine-core --save-dev
4.安装karma-cli：npm install -g karma-cli
5.初始化karma配置karma.conf.js文件
  输入karma init，按照下面进行配置

Which testing framework do you want to use ?
Press tab to list possible options. Enter to move to the next question.
> jasmine

Do you want to use Require.js ?
This will add Require.js plugin.
Press tab to list possible options. Enter to move to the next question.
> no

Do you want to capture any browsers automatically ?
Press tab to list possible options. Enter empty string to move to the next question.
> PhantomJS
>

What is the location of your source and test files ?
You can use glob patterns, eg. "js/*.js" or "test/**/*Spec.js".
Enter empty string to move to the next question.
>

Should any of the files included by the previous patterns be excluded ?
You can use glob patterns, eg. "**/*.swp".
Enter empty string to move to the next question.
>

Do you want Karma to watch all the files and run the tests on change ?
Press tab to list possible options.
> no


Config file generated at "E:\一灯\QA\test\karma.conf.js".

6.在项目下创建unit文件夹，在unit文件夹下创建index.js和index.spec.js
  index.js文件里写测试的单元

window.test = function(num){
    if(num == 1){
        return 1;
    }else{
        return num+1;
    }
}

  index.spec.js里写测试代码

describe("测试函数API",function(){
    it("+1测试的应用",function(){
        expect(window.test(1)).toBe(1);
        expect(window.test(2)).toBe(3);
    });
})

修改配置文件

files: [
   './unit/**/*.js',
   './unit/**/*.spec.js'
],
singleRun: true

7.安装无头浏览器的包
  npm install phantomjs --save-dev
  npm install karma-phantomjs-launcher --save-dev

8.装代码覆盖率的包：npm install karma-coverage --save-dev
  按照以下修改karma.conf.js

    files: [
     './unit/**/*.js',
     './unit/**/*.spec.js'
    ],
 
    // coverage reporter generates the coverage
    reporters: ['progress', 'coverage'],
 
    preprocessors: {
      // source files, that you wanna generate coverage for
      // do not include tests or libraries
      // (these files will be instrumented by Istanbul)
      'unit/**/*.js': ['coverage']
    },
 
    // optionally, configure the reporter
    coverageReporter: {
      type : 'html',
      dir : 'coverage/'
    }

9.大功告成:karma start 运行代码，在项目目录下会产生coverage文件夹，找到index.html在浏览器下打开，测试结果如下

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