Finish tests

evm/src/libraries/FractionMath.sol

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+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity ^0.8.13;
+
+import "src/interfaces/ISwapAdapterTypes.sol";
+
+library FractionMath {
+    /// @dev Compares two Fraction instances from ISwapAdapterTypes.
+    /// @param frac1 The first Fraction instance.
+    /// @param frac2 The second Fraction instance.
+    /// @return int8 Returns 0 if fractions are equal, 1 if frac1 is greater, -1
+    /// if frac1 is lesser.
+    function compareFractions(
+        ISwapAdapterTypes.Fraction memory frac1,
+        ISwapAdapterTypes.Fraction memory frac2
+    ) internal pure returns (int8) {
+        uint256 crossProduct1 = frac1.numerator * frac2.denominator;
+        uint256 crossProduct2 = frac2.numerator * frac1.denominator;
+
+        // fractions are equal
+        if (crossProduct1 == crossProduct2) return 0;
+        // frac1 is greater than frac2
+        else if (crossProduct1 > crossProduct2) return 1;
+        // frac1 is less than frac2
+        else return -1;
+    }
+}