无法在angular度示例项目上运行testing

我已经克隆了Angular Material-Start项目。 正如文件所述:

运行npm run tests来启动所有的Karmaunit testing。 但是这个提议给了我一个错误:

 npm ERR! Windows_NT 10.0.10586 npm ERR! argv "C:\\DevSoft\\NodeJs\\node.exe" "C:\\Users\\Taras\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "run" "tests" npm ERR! node v5.7.1 npm ERR! npm v3.8.9 npm ERR! missing script: tests npm ERR! npm ERR! If you need help, you may report this error at: npm ERR! <https://github.com/npm/npm/issues> npm ERR! Please include the following file with any support request: 

我做错了什么? 我怎样才能运行testing?