chromeos/test/data/network/valid_wifi_clientref.onc

{
    "GUID": "{77db0089-0bc8-4358-929c-123xcv}",
    "Type": "WiFi",
    "Name": "SomeWifi-XY",
    "WiFi": {
        "SSID": "SomeWifi-XY",
        "Security": "WPA-EAP",
        "Recommended": [ "AutoConnect" ],
        "EAP": {
            "Outer": "EAP-TLS",
            "Identity": "${LOGIN_ID}@my.domain.com",
            "UseSystemCAs": true,
            "ClientCertType": "Ref",
            "ClientCertRef": "{58ac1967-a0e7-49e9-be68-123abc}",
            "Recommended": [ "Identity" ],
            "SaveCredentials": true
        }
    },
    "ProxySettings": {
        "Type": "PAC",
        "PAC": "https://proxycfg.my.domain.com/proxy.dat"
    }
}