src/lib/fuchsia-async/meta/fuchsia_async_lib_test.cmx

{
    "facets": {
        "fuchsia.test": {
            "injected-services": {
                "fuchsia.posix.socket.Provider": "fuchsia-pkg://fuchsia.com/netstack#meta/netstack.cmx"
            }
        }
    },
    "program": {
        "binary": "test/fuchsia_async_lib_test"
    },
    "sandbox": {
        "services": [
            "fuchsia.posix.socket.Provider"
        ]
    }
}