test: add usdt distribution test on mainnet fork

packages/splits-v2/test/splitters/PullSplit.t.sol

@@ -2,15 +2,21 @@
 pragma solidity ^0.8.23;
 
 import { Clone } from "../../src/libraries/Clone.sol";
+import { SplitV2Lib } from "../../src/libraries/SplitV2.sol";
 
 import { PullSplit } from "../../src/splitters/pull/PullSplit.sol";
+
+import { PullSplitFactory } from "../../src/splitters/pull/PullSplitFactory.sol";
 import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 
 import { BaseTest } from "../Base.t.sol";
 
 contract PullSplitTest is BaseTest {
     PullSplit private pullSplit;
 
+    string MAINNET_RPC_URL = vm.envString("MAINNET_RPC_URL");
+
     function setUp() public override {
         super.setUp();
 
@@ -48,4 +54,46 @@ contract PullSplitTest is BaseTest {
         vm.expectRevert();
         pullSplit.depositToWarehouse(_token, _amount);
     }
+
+    function test_distribute_USDT_Mainnet() public {
+        // create new mainnet fork
+        uint256 mainnetFork = vm.createFork(MAINNET_RPC_URL, 21_395_163);
+        vm.selectFork(mainnetFork);
+
+        // replicate v2.0 split on mainnet failing to distribute usdt
+        address[] memory recipients = new address[](2);
+        recipients[0] = 0xa7128c450131A6a39751D1B0E2aA44f21B55Ea73;
+        recipients[1] = 0xAe4B8c350BB31ce40eaf75F154a2d354450cBe0f;
+
+        uint256[] memory allocations = new uint256[](2);
+        allocations[0] = 500_000;
+        allocations[1] = 500_000;
+
+        SplitV2Lib.Split memory split = SplitV2Lib.Split(recipients, allocations, 1_000_000, 0);
+
+        address owner = 0x0F17233C18aEB1278C6814b979a37031d123cFB8;
+        address splitAddress = 0xb051D24BDa0CB26877A982870E7B02Fb426c1963;
+        address token = 0xdAC17F958D2ee523a2206206994597C13D831ec7;
+        address oldWarehouse = 0x8fb66F38cF86A3d5e8768f8F1754A24A6c661Fb8;
+
+        // deploy v2.1 split on mainnet
+        pullFactory = new PullSplitFactory(oldWarehouse);
+
+        // deploy new split
+        address newSplit = pullFactory.createSplit(split, owner, owner);
+
+        // try to distribute v2.0 split which should revert
+        vm.expectRevert();
+        PullSplit(splitAddress).distribute(split, token, owner);
+
+        vm.startPrank(splitAddress);
+        // transfer usdt to new split
+        SafeERC20.safeTransfer(IERC20(token), newSplit, IERC20(token).balanceOf(splitAddress));
+        vm.stopPrank();
+
+        // distribute usdt
+        PullSplit(newSplit).distribute(split, token, owner);
+
+        assertEq(IERC20(token).balanceOf(newSplit), 1);
+    }
 }