Implement integration test with updated price calculation, set-prices script with validation, configure USDC deployment address, and fix ES module import errors

contracts/MockERC20.sol

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract MockERC20 is ERC20 {
+    uint8 private _decimals;
+
+    constructor(
+        string memory name,
+        string memory symbol,
+        uint8 decimalsValue
+    ) ERC20(name, symbol) {
+        _decimals = decimalsValue;
+        // Mint initial supply to deployer for testing
+        _mint(msg.sender, 1000000 * 10**decimalsValue);
+    }
+
+    function decimals() public view virtual override returns (uint8) {
+        return _decimals;
+    }
+
+    function mint(address to, uint256 amount) public {
+        _mint(to, amount);
+    }
+}

contracts/SEQICO.sol

@@ -22,7 +22,7 @@ contract SEQICO is Ownable {
         uint256 _pricePerTokenETH,
         uint256 _pricePerTokenUSDT,
         uint256 _pricePerTokenUSDC
-    ) {
+    ) Ownable(msg.sender) {
         seqToken = IERC20(_seqToken);
         usdt = IERC20(_usdt);
         usdc = IERC20(_usdc);
@@ -35,9 +35,21 @@ contract SEQICO is Ownable {
         seqToken = IERC20(_seqToken);
     }
 
+    function updatePriceETH(uint256 _pricePerTokenETH) external onlyOwner {
+        pricePerTokenETH = _pricePerTokenETH;
+    }
+
+    function updatePriceUSDT(uint256 _pricePerTokenUSDT) external onlyOwner {
+        pricePerTokenUSDT = _pricePerTokenUSDT;
+    }
+
+    function updatePriceUSDC(uint256 _pricePerTokenUSDC) external onlyOwner {
+        pricePerTokenUSDC = _pricePerTokenUSDC;
+    }
+
     function buyWithETH(uint256 tokenAmount) external payable {
         require(tokenAmount > 0, "Amount must be greater than 0");
-        uint256 requiredETH = pricePerTokenETH * tokenAmount;
+        uint256 requiredETH = pricePerTokenETH * tokenAmount / 1e18;
         require(msg.value >= requiredETH, "Insufficient ETH sent");
         require(seqToken.balanceOf(address(this)) >= tokenAmount, "Not enough SEQ tokens");
 

contracts/SEQToken.sol

@@ -9,15 +9,14 @@ contract SEQToken is ERC20, Ownable {
         uint256 totalSupply,
         address owner,
         address icoContract
-    ) ERC20("SEQ Token", "SEQ") {
+    ) ERC20("SEQ Token", "SEQ") Ownable(owner) {
         // Mint 10% to owner, 90% to ICO contract
         uint256 ownerAmount = (totalSupply * 10) / 100;
         uint256 icoAmount = totalSupply - ownerAmount;
 
         _mint(owner, ownerAmount);
         _mint(icoContract, icoAmount);
 
-        // Transfer ownership to the specified owner
-        _transferOwnership(owner);
+        // Ownership is already set in constructor
     }
 }

hardhat.config.js → hardhat.config.cjs

@@ -1,7 +1,7 @@
 require("@nomicfoundation/hardhat-toolbox");
 
 /** @type import('hardhat/config').HardhatUserConfig */
-const config = {
+module.exports = {
   solidity: "0.8.24",
   networks: {
     hardhat: {},
@@ -29,6 +29,4 @@ const config = {
   etherscan: {
     apiKey: process.env.ETHERSCAN_API_KEY,
   },
-};
-
-module.exports = config;
+};