报错：No coverage information was collected, exit without writing coverage information

先贴出报错：

注意：我的mocha单元测试均通过，但是istanbul的测试覆盖率却无法生效。

本地的test命令如下：

"scripts": {"test": "istanbul cover ./node_modules/.bin/_mocha",},

安装的istanbul的版本是：v0.4.5, 官方安装的。

解决方法：

重新安装istanbul，版本是v1.0.0-alpha.2。安装完成之后，命令行不需要改动，即可跑。

参考：https://stackoverflow.com/questions/34538964/es6-react-istanbul-no-coverage-information-was-collected-exit-without-writing-c

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