UniswapV2Factory.test.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {Test, console2} from "forge-std/Test.sol";
import {IERC20} from "../../../src/interfaces/IERC20.sol";
import {IWETH} from "../../../src/interfaces/IWETH.sol";
import {IUniswapV2Factory} from
    "../../../src/interfaces/uniswap-v2/IUniswapV2Factory.sol";
import {IUniswapV2Pair} from
    "../../../src/interfaces/uniswap-v2/IUniswapV2Pair.sol";
import {
    DAI,
    WETH,
    UNISWAP_V2_PAIR_DAI_WETH,
    UNISWAP_V2_FACTORY
} from "../../../src/Constants.sol";
import {ERC20} from "../../../src/ERC20.sol";

contract UniswapV2FactoryTest is Test {
    IWETH private constant weth = IWETH(WETH);
    IUniswapV2Factory private constant factory =
        IUniswapV2Factory(UNISWAP_V2_FACTORY);

    function test_createPair() public {
        ERC20 token = new ERC20("test", "TEST", 18);

        // Exercise - deploy token + WETH pair contract
        // Write your code here
        // Don’t change any other code
        address pair;

        address token0 = IUniswapV2Pair(pair).token0();
        address token1 = IUniswapV2Pair(pair).token1();

        if (address(token) < WETH) {
            assertEq(token0, address(token), "token 0");
            assertEq(token1, WETH, "token 1");
        } else {
            assertEq(token0, WETH, "token 0");
            assertEq(token1, address(token), "token 1");
        }
    }
}