Top 5 Bugs from Fuel Attackathon 33227-3(test case).rs

#[tokio::test]
async fn pow_bug() {
    //Setup
    let (instance, _id) = get_contract_instance().await;

    println!("------------u8 pow function overflow----------------");
    let asset_id = instance.methods().demonstrate_bug_u8(Identity::Address(instance.account().address().into()), 20)
        .append_variable_outputs(1)
        .call()
        .await
        .unwrap()
        .value;
    
    let balance = instance.account().get_asset_balance(&asset_id).await.unwrap();
    println!("balance: {:#?}", balance); 

    println!("------------u32 pow function overflow----------------");
    let coins_to_keep = instance.methods().demonstrate_bug_u32(1000).call().await.unwrap().value;
    println!("coins_to_keep: {:#?}", coins_to_keep);
    
    let coins_before = instance.account().get_coins(AssetId::zeroed()).await.unwrap()[0].amount;
    println!("coins_before: {:#?}", coins_before); 

    instance.account().transfer(
        &Bech32Address::from_str("fuel1glsm9rc8ysh9yjt8ljkuatalvdad3rs3wpqjznd3p7daydw2gg6sftwvvr").unwrap(),
        coins_before - TryInto::<u64>::try_into(coins_to_keep).unwrap(), 
        AssetId::zeroed(),
        TxPolicies::default()
    ).await.unwrap();

    let coins_after = instance.account().get_coins(AssetId::zeroed()).await.unwrap()[0].amount;
    println!("coins after: {:#?}", coins_after);
}