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: in_memory_db.rs
    path of file: ./repos/revm/crates/revm/src/db
    
    the code of the file until where you have to start completion: use super::{DatabaseCommit, DatabaseRef, EmptyDB};
use crate::primitives::{
    hash_map::Entry, Account, AccountInfo, Address, Bytecode, HashMap, Log, B256, KECCAK_EMPTY,
    U256,
};
use crate::Database;
use core::convert::Infallible;
use std::vec::Vec;

/// A [Database] implementation that stores all state changes in memory.
pub type InMemoryDB = CacheDB<EmptyDB>;

/// A [Database] implementation that stores all state changes in memory.
///
/// This implementation wraps a [DatabaseRef] that is used to load data ([AccountInfo]).
///
/// Accounts and code are stored in two separate maps, the `ac
    
    fn test_serialize_deserialize_cachedb() {
        let account = Address::with_last_byte(69);
        let nonce = 420;
        let mut init_state = CacheDB::new(EmptyDB::default());
        init_state.insert_account_info(
            account,
            AccountInfo {
                nonce,
                ..Default::default()
            },
        );

        let serialized = serde_json::to_string(&init_state).unwrap();
        let deserialized: CacheDB<EmptyDB> = serde_json::from_str(&serialized).unwrap();

        assert!(deserialized.accounts.get(&account).is_some());
        assert_eq!(
            deserialized.accounts.get(&account).unwrap().info.nonce,
            nonce
        );
    }