使用yo angular建立專案時，專案目錄沒有產生karma.conf.js這個東西，提示You don't seem to have a generator with the name “karma:app” installed，是yeoman缺少這個生成器嗎，這個生成器的名字是什麼？
You don't seem to have a generator with the name “karma:app” installed
npm install -g 生成器-karma
npm install -g 生成器-karma