Aave FlashLoan.sol sample for Ropsten network

FlashLoanReceiverBase.sol

contract FlashLoanReceiverBase is IFlashLoanReceiver {

    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    // TODO: Set here the address of the Aave protocol addresses provider.
    // See https://developers.aave.com/#the-lendingpooladdressesprovider. This address should not change once deployed.
    ILendingPoolAddressesProvider public constant addressesProvider =
    ILendingPoolAddressesProvider(address(0x1c8756FD2B28e9426CDBDcC7E3c4d64fa9A54728));
...