test: add SwapExactYtForSyTest

test/unit/SwapExactYtForSy.t.sol

@@ -1,6 +1,36 @@
 /// SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.13;
 
+import {ERC20} from "solmate/tokens/ERC20.sol";
+import {console} from "forge-std/Test.sol";
+import {PYIndexLib, IPYieldToken} from "pendle/core/StandardizedYield/PYIndex.sol";
 import {SetUp} from "../SetUp.sol";
 
-contract SwapExactYtForSyTest is SetUp {}
+contract SwapExactYtForSyTest is SetUp {
+    using PYIndexLib for IPYieldToken;
+
+    function test_swapExactYtForSy_TransfersTokens() public initSYPool {
+        address to = address(0xbeef);
+        deal(address(YT), address(this), 10 ether);
+        uint256 preSYBalance = ERC20(address(SY)).balanceOf(address(this));
+        uint256 preYTBalance = ERC20(address(YT)).balanceOf(to);
+
+        uint256 preSYBalanceRMM = ERC20(address(SY)).balanceOf(address(rmm));
+        uint256 preYTBalanceRMM = ERC20(address(YT)).balanceOf(address(rmm));
+
+        /*
+        (uint256 amountInWad, uint256 amountOutWad, uint256 amountIn, int256 deltaLiquidity, uint256 strike_) =
+            rmm.prepareSwapSyForExactPt(1 ether, block.timestamp, YT.newIndex());
+            */
+
+        uint256 amountIn = 1 ether;
+        (uint256 amountOut,,) = rmm.swapExactYtForSy(amountIn, 1000 ether, address(to));
+
+        /*
+        assertEq(ERC20(address(YT)).balanceOf(address(this)), preYTBalance - amountIn);
+        assertEq(ERC20(address(SY)).balanceOf(to), preSYBalance + amountOut);
+        assertEq(ERC20(address(YT)).balanceOf(address(rmm)), preYTBalanceRMM + amountIn);
+        assertEq(ERC20(address(SY)).balanceOf(address(rmm)), preSYBalanceRMM - amountOut);
+        */
+    }
+}