How to Fork Hedera Testnet and Interact with Deployed Contracts on the Latest Block

Foundry's forking mode lets you interact with contracts and run tests as if on a real network. Learn how to fork Hedera Testnet on the latest block and test your contracts with the latest state of the network.

What you will accomplish

• ✅ Deploy your smart contract to Hedera Testnet using forge create
• ✅ Use cast command-line tool to execute the createTodo function in TodoList.sol
• ✅ Fork Hedera Testnet on the latest block & run your tests against your deployed contract

Prerequisites

Before you begin, you should be familiar with the following:

• JavaScript
• Solidity
• Foundry

Have the following set up on your computer:

• git installed
  • Minimum version: 2.37
  • Recommended: Install Git (Github)
• A code editor or IDE
  • Recommended: VS Code. Install VS Code (Visual Studio)
• NodeJs + npm installed
  • Minimum version of NodeJs: 18
  • Minimum version of npm: 9.5
  • Recommended for Linux & Mac: nvm
  • Recommended for Windows: nvm-windows
• Foundry forge and cast installed
  • forge Minimum version: 0.2.0
  • cast Minimum version: 0.2.0

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Get started

The repo, github.com/hedera-dev/fork-hedera-testnet, is intended to be used alongside this tutorial.