Applying your knowledge to create an innovative DeFi application with proper testing using Foundry
We'll explore the current DeFi ecosystem, discussing key primitives like lending protocols, decentralized exchanges, yield aggregators, and stablecoins.
Add diagrams, examples, or explanations of DeFi protocols here.
This is a simplified implementation of an Automated Market Maker (AMM) contract:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
contract SimpleAMM is ReentrancyGuard {
// Contract code will be displayed here
// You can add your own implementation
}Example of a Foundry test for the AMM contract:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "forge-std/Test.sol";
import "../src/SimpleAMM.sol";
contract SimpleAMMTest is Test {
// Test code will be displayed here
// You can add your own implementation
}Install Foundry and create a new project. Set up the project structure with src/ and test/ directories.
Hint: Use the command `forge init my-defi-project` to create a new Foundry project.
Create a simple ERC-20 token contract and write comprehensive tests for it using Foundry. Include tests for minting, transferring, and approving tokens.
Hint: Use the `forge test` command to run your tests and `forge test -vvv` for verbose output.
Add fuzz tests to your token contract tests to verify that your contract behaves correctly with random inputs.
Hint: Use the `function testFuzz...` naming convention in your test functions and add parameters that Foundry will randomize.
Implement the SimpleAMM contract we discussed and write tests to verify its functionality, including liquidity provision, swapping, and fee collection.
Hint: Test edge cases like adding initial liquidity, swapping with minimal amounts, and removing all liquidity.
For your final project, you will design and implement your own DeFi primitive. This could be a variation of an existing primitive or something entirely new. Your project should demonstrate your understanding of smart contract development and DeFi concepts.