sdk/lib/fdio/tests/meta/fdio_test.cmx

{
    "program": {
        "binary": "test/fdio-test"
    },
    "sandbox": {
        "dev": [
            "zero"
        ],
        "features": [
            "deprecated-ambient-replace-as-executable",
            "isolated-temp"
        ],
        "services": [
            "fuchsia.process.Launcher"
        ]
    }
}