Uniswapv2pairlike https://chatgpt.com/share/677e0386-f0ac-800f-a922-f23ed299c55e

Uniswapv2pairlike.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./SimpleERC20.sol";
import "./UniswapV2PairLike.sol";

contract TestUniswapV2Pair {
    SimpleERC20 public tokenA;
    SimpleERC20 public tokenB;
    UniswapV2PairLike public pair;

    constructor() {
        // Deploy two ERC20 tokens
        tokenA = new SimpleERC20(1000 ether); // 1000 tokens with 18 decimals
        tokenB = new SimpleERC20(1000 ether); // 1000 tokens with 18 decimals

        // Deploy the UniswapV2PairLike contract
        pair = new UniswapV2PairLike(address(tokenA), address(tokenB));

        // Approve the pair contract to spend tokens on behalf of this contract
        tokenA.approve(address(pair), type(uint256).max);
        tokenB.approve(address(pair), type(uint256).max);

        // Add initial liquidity to the pool
        pair.addLiquidity(100 ether, 200 ether); // Add 100 TokenA and 200 TokenB
    }

    function testSwap() public {
        // Transfer tokens to simulate a user having them
        tokenA.transfer(address(pair), 10 ether); // Send 10 TokenA to the pair contract

        // Perform a swap, expecting TokenB in return
        pair.swap(0, 5 ether); // Request 5 TokenB as output
    }

    function getReserves() public view returns (uint256, uint256) {
        return pair.getReserves();
    }

    function balances() public view returns (uint256 balanceA, uint256 balanceB) {
        balanceA = tokenA.balanceOf(address(this));
        balanceB = tokenB.balanceOf(address(this));
    }
}