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: contract.rs
    path of file: ./repos/ethers-rs/ethers-etherscan/tests/it
    
    the code of the file until where you have to start completion: use crate::*;
use ethers_etherscan::contract::SourceCodeMetadata;
use serial_test::serial;

/// Abi of [0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413](https://api.etherscan.io/api?module=contract&action=getsourcecode&address=0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413).
const DAO_ABI: &str = include!("../../../testdata/the_dao_abi.expr");

#[tokio::test]
#[serial]
async fn can_fetch_ftm_contract_abi() {
    run_with_client(Chain::Fantom, |client| 
    
async fn can_fetch_contract_source_tree_for_singleton_contract() {
    run_with_client(Chain::Mainnet, |client| async move {
        let meta = client
            .contract_source_code("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
            .await
            .unwrap();

        assert_eq!(meta.items.len(), 1);
        let item = &meta.items[0];
        assert!(matches!(item.source_code, SourceCodeMetadata::SourceCode(_)));
        assert_eq!(item.source_code.sources().len(), 1);
        assert_eq!(item.abi().unwrap(), serde_json::from_str(DAO_ABI).unwrap());
    })
    .await
}