Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking. Use when testing Solidity contracts, setting up blockchain test suites, or validating DeFi protocols.
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name
web3-testing
description
Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking. Use when testing Solidity contracts, setting up blockchain test suites, or validating DeFi protocols.
Web3 Smart Contract Testing
Master comprehensive testing strategies for smart contracts using Hardhat, Foundry, and advanced testing patterns.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "forge-std/Test.sol";
import "../src/Token.sol";
contract TokenTest is Test {
Token token;
address owner = address(1);
address user1 = address(2);
address user2 = address(3);
function setUp() public {
vm.prank(owner);
token = new Token();
}
function testInitialSupply() public {
assertEq(token.totalSupply(), 1000000 * 10**18);
}
function testTransfer() public {
vm.prank(owner);
token.transfer(user1, 100);
assertEq(token.balanceOf(user1), 100);
assertEq(token.balanceOf(owner), token.totalSupply() - 100);
}
function testFailTransferInsufficientBalance() public {
vm.prank(user1);
token.transfer(user2, 100); // Should fail
}
function testCannotTransferToZeroAddress() public {
vm.prank(owner);
vm.expectRevert("Invalid recipient");
token.transfer(address(0), 100);
}
// Fuzzing test
function testFuzzTransfer(uint256 amount) public {
vm.assume(amount > 0 && amount <= token.totalSupply());
vm.prank(owner);
token.transfer(user1, amount);
assertEq(token.balanceOf(user1), amount);
}
// Test with cheatcodes
function testDealAndPrank() public {
// Give ETH to address
vm.deal(user1, 10 ether);
// Impersonate address
vm.prank(user1);
// Test functionality
assertEq(user1.balance, 10 ether);
}
// Mainnet fork test
function testForkMainnet() public {
vm.createSelectFork("https://eth-mainnet.alchemyapi.io/v2/...");
// Interact with mainnet contracts
address dai = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
assertEq(IERC20(dai).symbol(), "DAI");
}
}
Advanced Testing Patterns
Snapshot and Revert
describe("Complex State Changes", function () {
let snapshotId;
beforeEach(asyncfunction () {
snapshotId = await network.provider.send("evm_snapshot");
});
afterEach(asyncfunction () {
await network.provider.send("evm_revert", [snapshotId]);
});
it("Test 1", asyncfunction () {
// Make state changes
});
it("Test 2", asyncfunction () {
// State reverted, clean slate
});
});
Mainnet Forking
describe("Mainnet Fork Tests", function () {
let uniswapRouter, dai, usdc;
before(asyncfunction () {
await network.provider.request({
method: "hardhat_reset",
params: [
{
forking: {
jsonRpcUrl: process.env.MAINNET_RPC_URL,
blockNumber: 15000000,
},
},
],
});
// Connect to existing mainnet contracts
uniswapRouter = await ethers.getContractAt(
"IUniswapV2Router",
"0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D",
);
dai = await ethers.getContractAt(
"IERC20",
"0x6B175474E89094C44Da98b954EedeAC495271d0F",
);
});
it("Should swap on Uniswap", asyncfunction () {
// Test with real Uniswap contracts
});
});
