artiq/lit-test/test/devirtualization/device_db.pyon

{
    "comm": {
        "type": "local",
        "module": "artiq.coredevice.comm_dummy",
        "class": "Comm",
        "arguments": {}
    },
    "core": {
        "type": "local",
        "module": "artiq.coredevice.core",
        "class": "Core",
        "arguments": {"ref_period": 1e-9}
    }
}