无法 运行 测试 angular 示例项目

Can't run tests on angular sample project

我克隆了 Angular Material-Start 项目。正如文档所说:

run npm run tests to start all your Karma unit tests. But this conmmand gives me an error:

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 测试?

package.json 文件中没有 tests 脚本:

https://github.com/angular/material-start/blob/master/package.json

测试已被禁用:

https://github.com/angular/material-start/commit/3a525fe89581c5b945388c1714ca3e4b64027d1e