使用yo angular创建项目时，项目目录没有生成karma.conf.js这个东西，提示You don’t seem to have a generator with the name “karma:app” installed，是yeoman缺少这个生成器吗，这个生成器的名字是什么？
You don’t seem to have a generator with the name “karma:app” installed
npm install -g Generator-karma
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npm install -g Generator-karma