mev-beta/tests/contracts/ArbitrageTest.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "forge-std/Test.sol";
import "forge-std/console.sol";

interface IERC20 {
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
}

interface IUniswapV3Pool {
    function token0() external view returns (address);
    function token1() external view returns (address);
    function fee() external view returns (uint24);
    function slot0() external view returns (
        uint160 sqrtPriceX96,
        int24 tick,
        uint16 observationIndex,
        uint16 observationCardinality,
        uint16 observationCardinalityNext,
        uint8 feeProtocol,
        bool unlocked
    );
    function liquidity() external view returns (uint128);
    function swap(
        address recipient,
        bool zeroForOne,
        int256 amountSpecified,
        uint160 sqrtPriceLimitX96,
        bytes calldata data
    ) external returns (int256 amount0, int256 amount1);
}

contract ArbitrageTest is Test {
    // Arbitrum One addresses
    address constant WETH = 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1;
    address constant USDC = 0xa0B86a33E6417Ab7D461A67E4d3f14F6b49D3e8B;  // USDC.e
    address constant USDT = 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9;
    address constant ARB = 0x912CE59144191C1204E64559FE8253a0e49E6548;
    
    // Uniswap V3 pools (examples - replace with actual pool addresses)
    address constant WETH_USDC_POOL = 0xC6962004f452bE9203591991D15f6b388e09E8D0; // 0.05% fee
    address constant WETH_USDT_POOL = 0x641C00A822e8b671738d32a431a4Fb6074E5c79d; // 0.05% fee
    address constant USDC_USDT_POOL = 0x8C29E3e71A2Af86E06A41B8D12b8E4d86e5CDD50; // 0.05% fee
    
    // Test user account
    address testUser = makeAddr("testUser");
    
    function setUp() public {
        // Fork Arbitrum at a specific block for consistent testing
        vm.createFork(vm.envString("ARBITRUM_RPC_URL"));
        
        // Fund test user with ETH
        vm.deal(testUser, 100 ether);
        
        console.log("Test environment setup complete");
        console.log("Test user address:", testUser);
        console.log("Test user ETH balance:", address(testUser).balance / 1e18, "ETH");
    }
    
    function test_TokenBalancesAndPools() public view {
        // Test that we can read token balances and pool states
        console.log("=== Token Information ===");
        
        // Check token decimals and symbols
        console.log("WETH decimals:", IERC20(WETH).decimals());
        console.log("USDC decimals:", IERC20(USDC).decimals());
        console.log("USDT decimals:", IERC20(USDT).decimals());
        
        // Check pool states
        console.log("=== Pool Information ===");
        
        if (WETH_USDC_POOL.code.length > 0) {
            IUniswapV3Pool pool = IUniswapV3Pool(WETH_USDC_POOL);
            (uint160 sqrtPriceX96, int24 tick,,,,,) = pool.slot0();
            uint128 liquidity = pool.liquidity();
            uint24 fee = pool.fee();
            
            console.log("WETH/USDC Pool:");
            console.log("  Fee:", fee);
            console.log("  Liquidity:", liquidity);
            console.log("  Current tick:", tick);
            console.log("  SqrtPriceX96:", sqrtPriceX96);
        }
    }
    
    function test_SimulateLargeSwap() public {
        // Simulate a large swap that could create arbitrage opportunities
        console.log("=== Simulating Large Swap ===");
        
        // Get a whale address with USDC
        address whale = 0x47c031236e19d024b42f8AE6780E44A573170703; // Known USDC whale
        
        if (IERC20(USDC).balanceOf(whale) > 0) {
            uint256 whaleBalance = IERC20(USDC).balanceOf(whale);
            console.log("Whale USDC balance:", whaleBalance / 1e6, "USDC");
            
            // Simulate large trade impact
            vm.startPrank(whale);
            
            // Record pool state before
            if (WETH_USDC_POOL.code.length > 0) {
                IUniswapV3Pool pool = IUniswapV3Pool(WETH_USDC_POOL);
                (uint160 priceBefore,,,,,,) = pool.slot0();
                console.log("Price before swap:", priceBefore);
                
                // This would require actual swap execution
                console.log("Large swap simulation would occur here");
                console.log("This creates price discrepancy for arbitrage testing");
            }
            
            vm.stopPrank();
        }
    }
    
    function test_ArbitrageOpportunity() public {
        // Test detection of arbitrage opportunities
        console.log("=== Testing Arbitrage Detection ===");
        
        // Create artificial price discrepancy between two pools
        // In a real test, this would involve manipulating pool states
        
        console.log("Checking for arbitrage between WETH/USDC pools");
        
        // This would integrate with our Go arbitrage detection code
        // For now, we log the setup for the Go tests to use
        
        console.log("Pool 1 (WETH/USDC):", WETH_USDC_POOL);
        console.log("Pool 2 (WETH/USDT):", WETH_USDT_POOL);
        console.log("Bridge Pool (USDC/USDT):", USDC_USDT_POOL);
        
        // The Go test suite will use this forked state to test arbitrage detection
    }
    
    function test_FlashSwapSetup() public {
        // Test flash swap prerequisites
        console.log("=== Flash Swap Setup Test ===");
        
        // Verify we can interact with pools for flash swaps
        if (WETH_USDC_POOL.code.length > 0) {
            IUniswapV3Pool pool = IUniswapV3Pool(WETH_USDC_POOL);
            
            address token0 = pool.token0();
            address token1 = pool.token1();
            uint24 fee = pool.fee();
            
            console.log("Flash swap pool ready:");
            console.log("  Token0:", token0);
            console.log("  Token1:", token1);
            console.log("  Fee:", fee);
            console.log("  Pool has code:", WETH_USDC_POOL.code.length > 0);
        }
    }
}