TransactiveEnergy-TDD

pragma solidity ^0.8.0;

contract TransactiveEnergy-TDD {
    // Define variables for pricing and trading
    uint public energyPrice;
    mapping(address => uint) public energyBalance;
    mapping(address => uint) public etherBalance;

    // Define events for logging
    event EnergyPurchased(address buyer, uint energyAmount);
    event EnergySold(address seller, uint energyAmount);
    event EnergyPriceUpdated(uint newPrice);

    // Define functions for pricing and trading
    function setEnergyPrice(uint _energyPrice) public {
        energyPrice = _energyPrice;
        emit EnergyPriceUpdated(energyPrice);
    }

    function buyEnergy(uint _energyAmount) public payable {
        require(msg.value == energyPrice * _energyAmount, "Invalid amount of ether sent.");
        energyBalance[msg.sender] += _energyAmount;
        etherBalance[address(this)] += msg.value;
        emit EnergyPurchased(msg.sender, _energyAmount);
    }

    function sellEnergy(uint _energyAmount) public {
        require(energyBalance[msg.sender] >= _energyAmount, "Insufficient energy balance.");
        uint energyValue = energyPrice * _energyAmount;
        energyBalance[msg.sender] -= _energyAmount;
        etherBalance[msg.sender] += energyValue;
        emit EnergySold(msg.sender, _energyAmount);
    }

    // Define functions for testing
    function getEnergyBalance(address _account) public view returns (uint) {
        return energyBalance[_account];
    }

    function getEtherBalance(address _account) public view returns (uint) {
        return etherBalance[_account];
    }

    function testEnergyPricing() public {
        setEnergyPrice(10);
        assert(energyPrice == 10);
    }

    function testEnergyTrading() public {
        setEnergyPrice(10);
        address buyer = address(0x123);
        address seller = address(0x456);
        uint initialEtherBalance = etherBalance[address(this)];
        uint initialBuyerEnergyBalance = energyBalance[buyer];
        uint initialSellerEtherBalance = etherBalance[seller];
        buyEnergy{value: 100}(5);
        assert(energyBalance[buyer] == initialBuyerEnergyBalance + 5);
        assert(etherBalance[address(this)] == initialEtherBalance + 100);
        sellEnergy(3);
        assert(energyBalance[seller] == 3);
        assert(etherBalance[seller] == initialSellerEtherBalance + 30);
    }
}