add susds integration test

test/integration/sdai/SUsdsEthereum.t.sol

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import { BaseIntegration, IERC20, IERC4626 } from "../BaseIntegration.t.sol";
+
+contract SUsdsEthereumIntegrationTest is BaseIntegration {
+    uint256 fork;
+    uint256 forkBlock = 20772374;
+    uint256 forkBlockTimestamp = 1726600823;
+
+    address internal _asset = address(0xdC035D45d973E3EC169d2276DDab16f1e407384F);
+    address internal _assetWhale = address(0x2621CC0B3F3c079c1Db0E80794AA24976F0b9e3c);
+    address internal _yieldVault = address(0xa3931d71877C0E7a3148CB7Eb4463524FEc27fbD);
+
+    /* ============ setup ============ */
+
+    function setUpUnderlyingAsset() public virtual override returns (IERC20 asset, uint8 decimals, uint256 approxAssetUsdExchangeRate) {
+        return (IERC20(_asset), 18, 1e18);
+    }
+
+    function setUpYieldVault() public virtual override returns (IERC4626) {
+        return IERC4626(_yieldVault);
+    }
+
+    function setUpFork() public virtual override {
+        fork = vm.createFork(vm.rpcUrl("mainnet"), forkBlock);
+        vm.selectFork(fork);
+        vm.warp(forkBlockTimestamp);
+    }
+
+    function beforeSetup() public virtual override {
+        lowGasPriceEstimate = 7 gwei;
+    }
+
+    function afterSetup() public virtual override { }
+
+    /* ============ helpers to override ============ */
+
+    /// @dev The max amount of assets than can be dealt.
+    function maxDeal() public virtual override returns (uint256) {
+        return underlyingAsset.balanceOf(_assetWhale);
+    }
+
+    /// @dev May revert if the amount requested exceeds the amount available to deal.
+    function dealAssets(address to, uint256 amount) public virtual override prankception(_assetWhale) {
+        underlyingAsset.transfer(to, amount);
+    }
+
+    /// @dev Accrues yield by letting some time pass
+    function _accrueYield() internal virtual override {
+        vm.warp(block.timestamp + 1 days); // let 1 day pass by
+    }
+
+    /// @dev Since it's difficult to simulate any loss in the DSR system, we'll simulate loss by removing sDAI from the prize vault
+    function _simulateLoss() internal virtual override prankception(address(prizeVault)) {
+        yieldVault.transfer(_assetWhale, yieldVault.balanceOf(address(prizeVault)) / 2);
+    }
+
+}