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fork-testing

Use when testing against live protocol state on mainnet or L2 forks. Covers vm.createFork, account impersonation, block pinning, token dealing, and patterns for DeFi integration testing.

skills/fork-testing/SKILL.md

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# Fork Testing Patterns

## Overview

Fork testing runs your tests against a snapshot of a live blockchain. This lets you test interactions with real deployed contracts (Aave, Uniswap, Chainlink) without deploying mocks.

## Basic Fork Setup

```solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {Test, console2} from "forge-std/Test.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";