wct.conf.json

{
  "plugins": {
    "local": {
      "browsers": ["chrome", "firefox"]
    },
    "sauce": {
      "disabled": false,
      "browsers": [{
          "browserName": "microsoftedge",
          "platform": "Windows 10",
          "version": ""
        }, {
          "browserName": "internet explorer",
          "platform": "Windows 8.1",
          "version": "11"
        },
        {
          "browserName": "safari",
          "platform": "OS X 10.11",
          "version": "9"
        }
      ]
    }
  }
}