作为软件质量保证的重要一环,测试代码覆盖率是评判单元测试的重要标准。既然已经为你的代码编写了自动回归的单元测试,你当然想知道是不是所有的代码都测到了,完整的测试代码覆盖率可以说是零缺陷软件的决定性因素之一。
说到.net下的代码覆盖统计软件,当属NCover大名鼎鼎了,我们将其和NAant,Nunit一起配合使用,在每日构建和自动化测试领域是非常方便的,正如我前面所说的,对许多程序员而言,还是集成到一起比较方便使用,方便快捷地调用我想要的功能。因此,我将Ncover集成到了我的Nunit中。
由于现在的开发还是基于fw1.1,所以我也只用版本较低的NCover
那么.net部分做了些什么呢?看看我调用Ncover实现功能的代码:
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NCover必须要传入一个可执行文件来进行检查哪些代码被调用了,被检查的引用组件必须有pdb调试文件,否则是不分析。在上面的代码中,我传入nunit的控制台程序,让他跑一遍当前的测试dll,然后设置输出文件到被测试的组件的目录下,开启nunit-console进程,待进程结束后,就会有一个converage.xml文件产生,浏览此文件就能看到统计结果。
这中间都发生了什么,究竟是谁完成了这一切?.net部分的代码也没什么特别的地方:
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我对ncover的代码作了些改动,使新进程在后台运行,否则一运行nunit-console就弹出来一个命令行,很是不爽。从上面的代码可以看出系统仅仅设置了下进程初始状态和环境变量,就完成了覆盖统计和xml文件生成。来看看环境变量的配置代码:
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其实这部分代码就是把相关变量存起来,好让真正的负责人-ConverLib.dll来进行处理。ConverLib.dll负责根据环境变量的值来进行代码的跟踪和记录,生成相关的XML文件。为了使xml更可读,需要把一个xsl文件也自动拷过去。
最后,我们在tools菜单上添加一项查看代码覆盖率报表: