You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hc_stress_test.rs
    path of file: ./repos/holochain/crates/holochain/src/test_utils
    
    the code of the file until where you have to start completion: //! automated behavioral testing of hc-stress-test zomes

use crate::sweettest::*;
use holochain_types::prel
    
    pub async fn get_file(&mut self, cell: u8, hash: ActionHash) -> Option<Record> {
        self.conductor
            .as_ref()
            .unwrap()
            .call_fallible(
                &self.cells[cell as usize].zome(TestCoordinatorWasm::HcStressTestCoordinator),
                "get_file",
                hash,
            )
            .await
            .ok()
    }