兼容新版本依赖下，运行测试用例时重复监听同一端口的问题 #166
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兼容高版本环境下的测试用例
高版本环境下：
Node.js: 10.15.2
mocha: 6.1.4
should: 13.2.3
supertest: 4.0.2
express: 4.17.0
运行测试用例会占用3000端口，可能导致：
1.app已运行的情况下，会报端口已被占用的错误
2.app没有运行，测试用例运行后没有退出，继续监听端口
解决方法：
根据module.parent判断是否为运行测试用例，是的话则不监听端口