Created
August 29, 2024 05:43
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An example of collocated fuzz test with meta contract. To get complex generated code, one can copy-paste this file to MC GPT and then test each validations by the unit tests.
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.24; | |
| import {Schema} from "bundle/main/storage/Schema.sol"; | |
| import {Storage} from "bundle/main/storage/Storage.sol"; | |
| import {MCTest} from "@devkit/Flattened.sol"; // MCTestをインポート | |
| contract Borrow { | |
| function borrow(uint256 amount) external { | |
| Schema.GlobalState storage state = Storage.state(); | |
| uint256 collateral = state.collateralBalance[msg.sender]; | |
| uint256 maxBorrowable = collateral * 2 / 3; | |
| require(amount <= maxBorrowable, "Insufficient collateral"); | |
| state.debtBalance[msg.sender] += amount; | |
| } | |
| // Getter functions for testing | |
| function getCollateral(address user) external view returns (uint256) { | |
| Schema.GlobalState storage state = Storage.state(); | |
| return state.collateralBalance[user]; | |
| } | |
| function getDebt(address user) external view returns (uint256) { | |
| Schema.GlobalState storage state = Storage.state(); | |
| return state.debtBalance[user]; | |
| } | |
| } | |
| contract BorrowTest is MCTest { | |
| function setUp() public { | |
| _use(Borrow.borrow.selector, address(new Borrow())); | |
| } | |
| function testBorrowWithStateFuzzing(uint256 x) public { | |
| vm.assume(x > 1 ether && x < 1000 ether); | |
| uint256 collateral = x; | |
| vm.store(address(this), keccak256(abi.encode("collateralBalance", address(this))), bytes32(collateral)); | |
| uint256 maxBorrowable = collateral * 2 / 3; | |
| vm.assume(maxBorrowable > 0); | |
| uint256 borrowAmount = maxBorrowable / 2; | |
| Borrow(address(this)).borrow(borrowAmount); | |
| uint256 debt = Borrow(address(this)).getDebt(address(this)); | |
| assertEq(debt, borrowAmount, "Debt should be updated correctly"); | |
| uint256 requiredCollateral = debt * 150 / 100; | |
| uint256 currentCollateral = Borrow(address(this)).getCollateral(address(this)); | |
| assertTrue(currentCollateral >= requiredCollateral, "Collateral should cover at least 150% of the debt"); | |
| } | |
| function testBorrowWithLowCollateralRevert(uint256 x) public { | |
| vm.assume(x > 1 ether && x < 10 ether); | |
| uint256 collateral = x; | |
| vm.store(address(this), keccak256(abi.encode("collateralBalance", address(this))), bytes32(collateral)); | |
| uint256 excessiveBorrowAmount = collateral * 4 / 3; | |
| vm.expectRevert("Insufficient collateral"); | |
| Borrow(address(this)).borrow(excessiveBorrowAmount); | |
| } | |
| } |
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