11. Testing with Foundry and Hardhat, deployment

// test/SimpleBank.t.sol (Foundry)
import {Test} from "forge-std/Test.sol";
import {SimpleBank} from "../src/SimpleBank.sol";

contract SimpleBankTest is Test {
    SimpleBank bank;
    address alice = makeAddr("alice");

    function setUp() public { bank = new SimpleBank(); vm.deal(alice, 10 ether); }

    function test_DepositAndWithdraw() public {
        vm.startPrank(alice);
        bank.deposit{value: 1 ether}();
        bank.withdraw(0.4 ether);
        vm.stopPrank();
        assertEq(bank.balances(alice), 0.6 ether);
    }

    function test_RevertWhen_WithdrawTooMuch() public {
        vm.prank(alice);
        vm.expectRevert(abi.encodeWithSelector(SimpleBank.InsufficientBalance.selector, 1 ether, 0));
        bank.withdraw(1 ether);
    }

    function testFuzz_Deposit(uint96 amount) public {               // fuzzing: random inputs
        vm.assume(amount >= 0.01 ether && amount <= 10 ether);
        vm.prank(alice);
        bank.deposit{value: amount}();
        assertEq(bank.totalDeposits(), amount);
    }
}

forge init bank && forge build && forge test -vvv
forge test --gas-report && forge coverage
anvil                                                          # local node
forge script script/Deploy.s.sol --rpc-url $SEPOLIA_RPC --account deployer --broadcast --verify
cast call <address> "balances(address)(uint256)" <alice> --rpc-url $SEPOLIA_RPC

# Hardhat alternative
npx hardhat test
npx hardhat ignition deploy ./ignition/modules/Bank.ts --network sepolia --verify