plugins/ckeditor/bender-runner.config.json

{
  "bender": {
    "port": 9001
  },
  "server": {
    "port": 9002
  },
  "paths": {
    "ckeditor4": "../ckeditor4/",
    "runner": "./src/runner.html"
  },
  "browsers": {
    "linux": [ "chrome", "firefox" ],
    "macos": [ "safari" ]
  }
}