Cyfrin Foundry Course

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

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help

Convert hex to decimal

cast --to-base [number] dec

Save Env variables

Modify env Run source .env echo $RPC_URL

Run Anvil local blockchain

anvil

Anvil Rpc deploy smart contract

Adding rpc and hidden private key

forge create SimpleStorage --rpc-url http://127.0.0.1:8545 --interactive

Adding rpc and private key

forge create SimpleStorage --rpc-url http://127.0.0.1:8545 --private-key 0xasdasd

Deploy to Anvil by default and hidden private key

forge create SimpleStorage --interactive

Deploy Smart Contract with scripts

forge script script/DeploySimpleStorage.s.sol --rpc-url http://127.0.0.1:8545 --broadcast --private-key [private-key]

Using the .env variables

forge script script/DeploySimpleStorage.s.sol --rpc-url $RPC_URL --broadcast --private-key $PRIVATE_KEY

NOTE: Having the .env file is cool in development but for production, use --interactive for the private key

Interact with smart contract

Interact with contracts that already have been deployed

Cast

Send transaction

cast send 0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512 "store(uint256)" 123 --rpc-url $RPC_URL --private-key $PRIVATE_KEY

Read function

cast call 0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512 "retrieve()" 

Thirdweb deploy

npx thirdweb deploy

Format Code

forge fmt

Tests

Console log inside tests

forge test -vv

Test with testnet

forge test -vv  --fork-url $SEPOLIA_RPC_URL

Run only one test

forge test --match-test testPriceFeedVersionIsAccurate

// What can we do to work with addresses outside our system? // 1. Unit // - Testing a specific part of our code // 2. Integration // - Testing how our code works with other parts of our code // 3. Forked // - Testing our code on a simulated real environment // 4. Staging // - Testing our code in a real environment that is not prod

Test using a real testnet

forge test --match-test testPriceFeedVersionIsAccurate -vvv --fork-url $SEPOLIA_RPC_URL

See tests coverage

forge coverage -vvv --fork-url $SEPOLIA_RPC_URL