lcov gcov 去除 thirdparty https://blog.csdn.net/hanshuai584044490/article/details/83374617
单元测试入门 http://www.cnblogs.com/turtle-fly/archive/2013/01/09/2851474.html
基础 精华 http://www.voidcn.com/article/p-mlbosoco-uh.html单元测试
原文：https://www.cnblogs.com/nowheretrix/p/10482384.html
