chore: rename fee variable in calculateRedemptionFee

src/FeeCalculator.sol

@@ -93,20 +93,20 @@ contract FeeCalculator is IDepositFeeCalculator, IRedemptionFeeCalculator {
     /// @notice Calculates the redemption fees for a given amount.
     /// @param tco2 The address of the TCO2 token.
     /// @param pool The address of the pool.
-    /// @param depositAmount The amount to be redeemed.
+    /// @param redemptionAmount The amount to be redeemed.
     /// @return recipients The addresses of the fee recipients.
     /// @return feesDenominatedInPoolTokens The amount of fees each recipient should receive.
-    function calculateRedemptionFee(address tco2, address pool, uint256 depositAmount)
+    function calculateRedemptionFee(address tco2, address pool, uint256 redemptionAmount)
         external
         view
         override
         returns (address[] memory recipients, uint256[] memory feesDenominatedInPoolTokens)
     {
-        require(depositAmount > 0, "depositAmount must be > 0");
+        require(redemptionAmount > 0, "redemptionAmount must be > 0");
 
-        uint256 totalFee = getRedemptionFee(depositAmount, getTokenBalance(pool, tco2), getTotalSupply(pool));
+        uint256 totalFee = getRedemptionFee(redemptionAmount, getTokenBalance(pool, tco2), getTotalSupply(pool));
 
-        require(totalFee <= depositAmount, "Fee must be lower or equal to redemption amount");
+        require(totalFee <= redemptionAmount, "Fee must be lower or equal to redemption amount");
         require(totalFee > 0, "Fee must be greater than 0");
 
         return distributeFeeAmongShares(totalFee);

test/FeeCalculator.t.sol

@@ -533,6 +533,20 @@ contract FeeCalculatorTest is Test {
         assertEq(fees[0], 35999999999999999154);
     }
 
+    function testCalculateRedemptionFees_ZeroDeposit_ExceptionShouldBeThrown() public {
+        // Arrange
+        // Set up your test data
+        uint256 redemptionAmount = 0;
+
+        // Set up mock pool
+        mockPool.setTotalSupply(1000 * 1e18);
+        mockToken.setTokenBalance(address(mockPool), 500 * 1e18);
+
+        // Act
+        vm.expectRevert("redemptionAmount must be > 0");
+        feeCalculator.calculateRedemptionFee(address(mockToken), address(mockPool), redemptionAmount);
+    }
+
     function testCalculateRedemptionFees_TotalEqualCurrent_FeeCappedAt10Percent() public {
         // Arrange
         // Set up your test data