First Steps with Foundry

This section provides an overview of the forge command line tool. We demonstrate how to create a new project, compile, and test it.

To start a new project with Foundry, use forge init:

$ forge init hello_foundry

Let’s check out what forge generated for us:

$ cd hello_foundry
$ tree . -d -L 1
.
├── lib
├── script
├── src
└── test

4 directories

We can build the project with forge build:

$ forge build
Compiling 27 files with 0.8.19
Solc 0.8.19 finished in 1.25s
Compiler run successful!

And run the tests with forge test:

$ forge test
No files changed, compilation skipped

Ran 2 tests for test/Counter.t.sol:CounterTest
[PASS] testFuzz_SetNumber(uint256) (runs: 256, μ: 30454, ~: 31310)
[PASS] test_Increment() (gas: 31325)
Suite result: ok. 2 passed; 0 failed; 0 skipped; finished in 10.22ms (9.94ms CPU time)

Ran 1 test suite in 11.94ms (10.22ms CPU time): 2 tests passed, 0 failed, 0 skipped (2 total tests)

💡 Tip

You can always print help for any subcommand (or their subcommands) by adding --help at the end.

You can watch these beginner tutorials if you are a visual learner.

Foundry Book

First Steps with Foundry