pub trait FakeEndpointProxyInterface: Send + Sync {
type WriteResponseFut: Future<Output = Result<(), Error>> + Send;
type ReadResponseFut: Future<Output = Result<(Vec<u8>, u64), Error>> + Send;
// Required methods
fn write(&self, data: &[u8]) -> Self::WriteResponseFut;
fn read(&self) -> Self::ReadResponseFut;
}