wct.conf.json

{
    "verbose": false,
    "plugins": {
        "local": {
            "browsers": ["chrome", "firefox"]
        },
        "sauce": {
            "disabled": true,
            "browsers": [{
                "browserName": "microsoftedge",
                "platform": "Windows 10",
                "version": ""
            }, {
                "browserName": "safari",
                "platform": "OS X 10.13"
            }]
        }
    }
}