src/developer/cmd/meta/cmd_unittests.cmx

{
    "facets": {
        "fuchsia.test": {
            "system-services": [
                "fuchsia.hardware.pty.Device"
            ]
        }
    },
    "program": {
        "binary": "test/cmd_unittests"
    },
    "sandbox": {
        "services": [
            "fuchsia.hardware.pty.Device",
            "fuchsia.process.Launcher"
        ]
    }
}