test: calculate incremental unittest coverage #1783
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背景
现在统计增量覆盖率，比较粗放。直接统计每个修改文件的单测覆盖率。这就导致修改老文件时，覆盖率一直失败。
修复
目前，没有已有的工具能够计算本次提交中代码的覆盖率。所以，写了一个python脚本，大概原理如下：