test: add WETH, fix wrong constructor param for DFMM

src/test/helpers/SetUp.sol

@@ -4,6 +4,7 @@ pragma solidity ^0.8.13;
 import "forge-std/Test.sol";
 import { MockERC20 } from "solmate/test/utils/mocks/MockERC20.sol";
 import { DFMM } from "src/DFMM.sol";
+import { WETH } from "solmate/tokens/WETH.sol";
 import { IDFMM } from "src/interfaces/IDFMM.sol";
 import { LPToken } from "src/LPToken.sol";
 import { Lex } from "src/test/helpers/Lex.sol";
@@ -13,7 +14,7 @@ contract SetUp is Test {
     Lex lex;
     MockERC20 tokenX;
     MockERC20 tokenY;
-    LPToken lpTokenImplementation;
+    WETH weth;
 
     uint256 public constant TEST_SWAP_FEE = 0.003 ether;
 
@@ -24,8 +25,8 @@ contract SetUp is Test {
         tokenY.mint(address(this), 100e18);
 
         lex = new Lex(address(tokenX), address(tokenY), 1 ether);
-        LPToken lpToken = new LPToken();
-        dfmm = new DFMM(address(lpToken));
+        weth = new WETH();
+        dfmm = new DFMM(address(weth));
 
         tokenX.approve(address(dfmm), type(uint256).max);
         tokenY.approve(address(dfmm), type(uint256).max);
@@ -39,4 +40,8 @@ contract SetUp is Test {
         IDFMM.Pool memory pool = dfmm.getPool(poolId);
         return pool.liquidityToken;
     }
+
+    function skip() public {
+        vm.skip(true);
+    }
 }