test: fuzz test exact input v4 against v4 quoter

.gas-snapshot

@@ -0,0 +1,3 @@
+MixedRouteQuoterV2TestOnSepolia:test_FuzzQuoteExactInput(uint256) (runs: 5000, μ: 74013, ~: 74014)
+MixedRouteQuoterV2TestOnSepolia:test_QuoteExactInput() (gas: 74116)
+MixedRouteQuoterV2TestOnSepolia:test_QuoteExactInputSingleV4() (gas: 69120)

package.json

@@ -9,6 +9,7 @@
     "src/**/*.json"
   ],
   "scripts": {
+    "fmt": "forge fmt",
     "build": "forge build",
     "test": "forge test"
   },

test/MixedRouteQuoterV2OnSepolia.t.sol

@@ -8,10 +8,14 @@ import {Test, console} from "forge-std/Test.sol";
 import {PoolKey} from "@uniswap/v4-core/src/types/PoolKey.sol";
 import {Currency} from "@uniswap/v4-core/src/types/Currency.sol";
 import {IHooks} from "@uniswap/v4-core/src/interfaces/IHooks.sol";
+import {IQuoter} from "@uniswap/v4-periphery/src/interfaces/IQuoter.sol";
 import {Constants} from "../src/libraries/Constants.sol";
+import {Quoter} from "v4-periphery/src/lens/Quoter.sol";
+import {PathKey} from "@uniswap/v4-periphery/src/libraries/PathKey.sol";
 
 contract MixedRouteQuoterV2TestOnSepolia is Test {
     IMixedRouteQuoterV2 public mixedRouterQuoterV2;
+    IQuoter public quoter;
     IPoolManager public poolManager;
     address public immutable uniswapV4PoolManager = 0xc021A7Deb4a939fd7E661a0669faB5ac7Ba2D5d6;
     address public immutable uniswapV3PoolFactory = 0x0227628f3F023bb0B980b67D528571c95c6DaC1c;
@@ -24,6 +28,7 @@ contract MixedRouteQuoterV2TestOnSepolia is Test {
         vm.createSelectFork(vm.envString("SEPOLIA_RPC_URL"));
         poolManager = IPoolManager(uniswapV4PoolManager);
         mixedRouterQuoterV2 = new MixedRouteQuoterV2(poolManager, uniswapV3PoolFactory, uniswapV2PoolFactory);
+        quoter = new Quoter(poolManager);
     }
 
     function test_QuoteExactInputSingleV4() public {
@@ -94,8 +99,9 @@ contract MixedRouteQuoterV2TestOnSepolia is Test {
         uint24 fee = 500;
         uint24 tickSpacing = 10;
         address hooks = address(0);
+        bytes memory hookData = "0x";
         IMixedRouteQuoterV2.NonEncodableData[] memory nonEncodableData = new IMixedRouteQuoterV2.NonEncodableData[](1);
-        nonEncodableData[0] = (IMixedRouteQuoterV2.NonEncodableData({hookData: "0x"}));
+        nonEncodableData[0] = (IMixedRouteQuoterV2.NonEncodableData({hookData: hookData}));
 
         // bytes memory path = abi.encodePacked(V4_SEPOLIA_OP_ADDRESS, fee,tickSpacing, hooks, V4_SEPOLIA_USDC_ADDRESS);
         IMixedRouteQuoterV2.ExtraQuoteExactInputParams memory extraParams = IMixedRouteQuoterV2.ExtraQuoteExactInputParams({
@@ -106,8 +112,60 @@ contract MixedRouteQuoterV2TestOnSepolia is Test {
             poolVersions, V4_SEPOLIA_OP_ADDRESS, fee, tickSpacing, hooks, V4_SEPOLIA_USDC_ADDRESS
         );
 
-        (uint256 amountOut, , , uint256 gasEstimate) = mixedRouterQuoterV2.quoteExactInput(path, extraParams, amountIn);
-        assertGt(amountOut, 0);
+        (
+            uint256 amountOut,
+            uint160[] memory sqrtPriceX96After,
+            uint32[] memory initializedTicksLoaded,
+            uint256 gasEstimate
+        ) = mixedRouterQuoterV2.quoteExactInput(path, extraParams, amountIn);
+
         assertGt(gasEstimate, 0);
+
+        PathKey[] memory exactInPathKey = new PathKey[](1);
+        exactInPathKey[0] = PathKey({
+            intermediateCurrency: Currency.wrap(V4_SEPOLIA_USDC_ADDRESS),
+            fee: fee,
+            tickSpacing: int24(tickSpacing),
+            hooks: IHooks(hooks),
+            hookData: hookData
+        });
+
+        IQuoter.QuoteExactParams memory exactInParams = IQuoter.QuoteExactParams({
+            exactCurrency: Currency.wrap(V4_SEPOLIA_OP_ADDRESS),
+            path: exactInPathKey,
+            exactAmount: uint128(amountIn)
+        });
+
+        (
+            int128[] memory expectedDeltaAmounts,
+            uint160[] memory expectedSqrtPriceX96After,
+            uint32[] memory expectedInitializedTicksLoaded
+        ) = quoter.quoteExactInput(exactInParams);
+
+        uint256 expectedAmountOut = uint256(uint128(-expectedDeltaAmounts[exactInPathKey.length])); // negate the final delta amount out
+        assertEqUint(amountOut, expectedAmountOut);
+        assertEqUint(sqrtPriceX96After[0], expectedSqrtPriceX96After[0]);
+        assertEqUint(initializedTicksLoaded[0], expectedInitializedTicksLoaded[0]);
+
+        // mixed quoter doesn't support exact out by design, but we can cross check the final amount in will equate the original input amount in,
+        // if we call the v4 quoter for the exact out quote. v3 and v4 quoter support exact out quote
+        PathKey[] memory exactOutPathKey = new PathKey[](1);
+        exactOutPathKey[0] = PathKey({
+            intermediateCurrency: Currency.wrap(V4_SEPOLIA_OP_ADDRESS),
+            fee: fee,
+            tickSpacing: int24(tickSpacing),
+            hooks: IHooks(hooks),
+            hookData: hookData
+        });
+
+        IQuoter.QuoteExactParams memory exactOutParams = IQuoter.QuoteExactParams({
+            exactCurrency: Currency.wrap(V4_SEPOLIA_USDC_ADDRESS),
+            path: exactOutPathKey,
+            exactAmount: uint128(expectedAmountOut)
+        });
+
+        (int128[] memory expectedDeltaAmountsIn, , ) = quoter.quoteExactOutput(exactOutParams);
+        uint256 expectedAmountIn = uint256(uint128(expectedDeltaAmountsIn[0])); // final delta amount in is the positive amount in the first array element
+        assertApproxEqAbs(amountIn, expectedAmountIn, 1);
     }
 }

yarn.lock

@@ -0,0 +1,27 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@openzeppelin/[email protected]":
+  version "4.7.0"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.7.0.tgz#3092d70ea60e3d1835466266b1d68ad47035a2d5"
+  integrity sha512-52Qb+A1DdOss8QvJrijYYPSf32GUg2pGaG/yCxtaA3cu4jduouTdg4XZSMLW9op54m1jH7J8hoajhHKOPsoJFw==
+
+"@uniswap/[email protected]":
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/@uniswap/universal-router/-/universal-router-1.6.0.tgz#3d7372e98a0303c70587802ee6841b8b6b42fc6f"
+  integrity sha512-Gt0b0rtMV1vSrgXY3vz5R1RCZENB+rOkbOidY9GvcXrK1MstSrQSOAc+FCr8FSgsDhmRAdft0lk5YUxtM9i9Lg==
+  dependencies:
+    "@openzeppelin/contracts" "4.7.0"
+    "@uniswap/v2-core" "1.0.1"
+    "@uniswap/v3-core" "1.0.0"
+
+"@uniswap/[email protected]":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@uniswap/v2-core/-/v2-core-1.0.1.tgz#af8f508bf183204779938969e2e54043e147d425"
+  integrity sha512-MtybtkUPSyysqLY2U210NBDeCHX+ltHt3oADGdjqoThZaFRDKwM6k1Nb3F0A3hk5hwuQvytFWhrWHOEq6nVJ8Q==
+
+"@uniswap/[email protected]":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@uniswap/v3-core/-/v3-core-1.0.0.tgz#6c24adacc4c25dceee0ba3ca142b35adbd7e359d"
+  integrity sha512-kSC4djMGKMHj7sLMYVnn61k9nu+lHjMIxgg9CDQT+s2QYLoA56GbSK9Oxr+qJXzzygbkrmuY6cwgP6cW2JXPFA==