start-server-and-test not detecting loaded server

[bahmutov]

Use command npm run cy that is very simple to see.

$ DEBUG=start-server-and-test npm run cy

> ng-cli-test1@0.0.0 cy /Users/gleb/git/ng-cli-test1
> start-server-and-test start http://localhost:4200 message

starting server using command "npm run start"
and when url "http://localhost:4200" is responding
running tests using command "message"
  start-server-and-test starting server +0ms

> ng-cli-test1@0.0.0 start /Users/gleb/git/ng-cli-test1
> ng serve

** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
Date: 2018-03-29T21:10:38.674Z                                                          
Hash: 0f5884ebddb64cc764cb
Time: 5335ms
chunk {inline} inline.bundle.js (inline) 3.85 kB [entry] [rendered]
chunk {main} main.bundle.js (main) 17.9 kB [initial] [rendered]
chunk {polyfills} polyfills.bundle.js (polyfills) 549 kB [initial] [rendered]
chunk {styles} styles.bundle.js (styles) 41.5 kB [initial] [rendered]
chunk {vendor} vendor.bundle.js (vendor) 7.42 MB [initial] [rendered]

webpack: Compiled successfully.

Keeps hanging after that.