初始化vue-cli项目之后，运行npm run unit报错，解决方法如下（亲测可行）。
问题1： Option "mapCoverage" has been removed, as it's no longer necessary.
解决：此属性已移除，详细可以见 https://jestjs.io/docs/en/configuration 官方公布的属性，在test/unit/jest.conf.js找到并删除该属性
//mapCoverage: true,
问题2：localStorage is not available for opaque origins
解决：在jest.config.js里，增加这两个属性定义
module.exports = {
verbose:true,
testURL:"http://localhost/",
...}
可参考https://stackoverflow.com/questions/51554366/jest-securityerror-localstorage-is-not-available-for-opaque-origins#
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