gru_emoney_token-factory/test/fuzz/TransferFuzz.t.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "forge-std/Test.sol";
import "../../src/eMoneyToken.sol";
import "../../src/PolicyManager.sol";
import "../../src/ComplianceRegistry.sol";
import "../../src/DebtRegistry.sol";
import "../../src/errors/TokenErrors.sol";
import "../../src/libraries/ReasonCodes.sol";
import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";

contract TransferFuzz is Test {
    eMoneyToken public token;
    PolicyManager public policyManager;
    ComplianceRegistry public complianceRegistry;
    DebtRegistry public debtRegistry;

    address public admin;
    address public issuer;
    address public user1;
    address public user2;

    function setUp() public {
        admin = address(0x1);
        issuer = address(0x2);
        user1 = address(0x10);
        user2 = address(0x20);

        complianceRegistry = new ComplianceRegistry(admin);
        debtRegistry = new DebtRegistry(admin);
        policyManager = new PolicyManager(admin, address(complianceRegistry), address(debtRegistry));

        eMoneyToken implementation = new eMoneyToken();

        bytes memory initData = abi.encodeWithSelector(
            eMoneyToken.initialize.selector,
            "Test Token",
            "TEST",
            18,
            issuer,
            address(policyManager),
            address(debtRegistry),
            address(complianceRegistry)
        );

        ERC1967Proxy proxy = new ERC1967Proxy(address(implementation), initData);
        token = eMoneyToken(address(proxy));

        vm.startPrank(admin);
        policyManager.grantRole(policyManager.POLICY_OPERATOR_ROLE(), admin);
        policyManager.setLienMode(address(token), 2); // Encumbered mode
        complianceRegistry.grantRole(complianceRegistry.COMPLIANCE_ROLE(), admin);
        complianceRegistry.setCompliance(user1, true, 1, bytes32(0));
        complianceRegistry.setCompliance(user2, true, 1, bytes32(0));
        debtRegistry.grantRole(debtRegistry.DEBT_AUTHORITY_ROLE(), admin);
        vm.stopPrank();
    }

    function testFuzz_transferWithLien(
        uint256 mintAmount,
        uint256 lienAmount,
        uint256 transferAmount
    ) public {
        // Bound inputs to reasonable ranges
        mintAmount = bound(mintAmount, 1, type(uint128).max);
        lienAmount = bound(lienAmount, 0, mintAmount);
        transferAmount = bound(transferAmount, 0, mintAmount);

        // Mint to user1
        vm.prank(issuer);
        token.mint(user1, mintAmount, ReasonCodes.OK);

        // Place lien
        if (lienAmount > 0) {
            vm.prank(admin);
            debtRegistry.placeLien(user1, lienAmount, 0, 1, ReasonCodes.LIEN_BLOCK);
        }

        uint256 freeBalance = token.freeBalanceOf(user1);
        bool shouldSucceed = transferAmount <= freeBalance && transferAmount > 0;

        if (shouldSucceed) {
            vm.prank(user1);
            token.transfer(user2, transferAmount);

            assertEq(token.balanceOf(user1), mintAmount - transferAmount);
            assertEq(token.balanceOf(user2), transferAmount);
        } else if (transferAmount > freeBalance && lienAmount > 0) {
            // Should fail with insufficient free balance
            vm.expectRevert();
            vm.prank(user1);
            token.transfer(user2, transferAmount);
        }
    }

    function testFuzz_transferWithMultipleLiens(
        uint256 mintAmount,
        uint256[3] memory lienAmounts,
        uint256 transferAmount
    ) public {
        mintAmount = bound(mintAmount, 1000, type(uint128).max);
        transferAmount = bound(transferAmount, 0, mintAmount);

        // Bound lien amounts
        for (uint256 i = 0; i < 3; i++) {
            lienAmounts[i] = bound(lienAmounts[i], 0, mintAmount / 3);
        }

        // Mint to user1
        vm.prank(issuer);
        token.mint(user1, mintAmount, ReasonCodes.OK);

        // Place multiple liens
        uint256 totalLienAmount = 0;
        for (uint256 i = 0; i < 3; i++) {
            if (lienAmounts[i] > 0) {
                vm.prank(admin);
                debtRegistry.placeLien(user1, lienAmounts[i], 0, 1, ReasonCodes.LIEN_BLOCK);
                totalLienAmount += lienAmounts[i];
            }
        }

        uint256 freeBalance = mintAmount > totalLienAmount ? mintAmount - totalLienAmount : 0;
        bool shouldSucceed = transferAmount <= freeBalance && transferAmount > 0;

        if (shouldSucceed) {
            vm.prank(user1);
            token.transfer(user2, transferAmount);

            assertEq(token.balanceOf(user1), mintAmount - transferAmount);
        } else if (transferAmount > freeBalance && totalLienAmount > 0) {
            vm.expectRevert();
            vm.prank(user1);
            token.transfer(user2, transferAmount);
        }
    }

    function testFuzz_freeBalanceCalculation(
        uint256 balance,
        uint256 encumbrance
    ) public {
        balance = bound(balance, 0, type(uint128).max);
        encumbrance = bound(encumbrance, 0, type(uint128).max);

        if (balance > 0) {
            vm.prank(issuer);
            token.mint(user1, balance, ReasonCodes.OK);
        }

        if (encumbrance > 0) {
            vm.prank(admin);
            debtRegistry.placeLien(user1, encumbrance, 0, 1, ReasonCodes.LIEN_BLOCK);
        }

        uint256 freeBalance = token.freeBalanceOf(user1);
        uint256 expectedFreeBalance = balance > encumbrance ? balance - encumbrance : 0;

        assertEq(freeBalance, expectedFreeBalance, "Free balance calculation incorrect");
    }
}