src/sys/build/tests/echo_client_test.cmx

{
    "include": [
        "sdk/lib/diagnostics/syslog/client.shard.cmx"
    ],
    "program": {
        "binary": "bin/echo_client_test"
    },
    "sandbox": {
        "services": [
            "fidl.examples.echo.Echo",
            "fuchsia.sys.Launcher"
        ]
    }
}