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: read.rs
    path of file: ./repos/namada/crates/ethereum_bridge/src/protocol/transactions
    
    the code of the file until where you have to start completion: //! Helpers for reading from storage
use borsh::BorshDeserialize;
use eyre::{eyre, Result};
use namada_core::storage;
use namada_core::token::Amount;
use namada_state::{DBIter, StorageHasher, WlState, DB};
use nama
    
    fn test_amount_returns_stored_amount() {
        let key = storage::Key::parse("some arbitrary key").unwrap();
        let amount = Amount::from(1_000_000);
        let mut fake_storage = TestState::default();
        fake_storage.write(&key, amount).unwrap();

        let amt = read::amount_or_default(&fake_storage, &key).unwrap();
        assert_eq!(amt, amount);
    }