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: footer.rs
    path of file: ./repos/solana/accounts-db/src/tiered_storage
    
    the code of the file until where you have to start completion: use {
    crate::tiered_storage::{
        error::TieredStorageError,
        file::TieredStorageFile,
        index::IndexBlockFormat,
        mmap_utils::{get_pod, get_type},
        owners::OwnersBlockFormat,
        TieredStorageResult,
    },
    bytemuck::{Pod, Zeroable},
    memmap2::Mmap,
    num_enum::TryFromPrimitiveError,
    solana_sdk::{hash::Hash, pubkey::Pubkey},
    std::{mem, path::Path},
    thiserror::Error,
};

pub const FOOTER_FORMAT_VERSION: u64 = 1;

/// The size of the footer struct + the magic number at the end.
pub const FOOTER_SIZE: usize =
    mem::size_of::<TieredStorageFooter>() + mem::size_of::<TieredStorageMagicNumber>();
static_assertions::const_assert_eq!(mem::size_of::<TieredStorageFooter>(), 160);

/// The size of the ending part of the footer.  This size should remain unchanged
/// even when the footer's format changes.
pub const FOOTER_TAIL_SIZE: usize = 24;

///
    
    fn test_footer() {
        let path = get_append_vec_path("test_file_footer");
        let expected_footer = TieredStorageFooter {
            account_meta_format: AccountMetaFormat::Hot,
            owners_block_format: OwnersBlockFormat::AddressesOnly,
            index_block_format: IndexBlockFormat::AddressesThenOffsets,
            account_block_format: AccountBlockFormat::AlignedRaw,
            account_entry_count: 300,
            account_meta_entry_size: 24,
            account_block_size: 4096,
            owner_count: 250,
            owner_entry_size: 32,
            index_block_offset: 1069600,
            owners_block_offset: 1081200,
            hash: Hash::new_unique(),
            min_account_address: Pubkey::default(),
            max_account_address: Pubkey::new_unique(),
            format_version: FOOTER_FORMAT_VERSION,
            footer_size: FOOTER_SIZE as u64,
        };

        // Persist the expected footer.
        {
            let file = TieredStorageFile::new_writable(&path.path).unwrap();
            expected_footer.write_footer_block(&file).unwrap();
        }

        // Reopen the same storage, and expect the persisted footer is
        // the same as what we have written.
        {
            let footer = TieredStorageFooter::new_from_path(&path.path).unwrap();
            assert_eq!(expected_footer, footer);
        }
    }