Genesis Account Allocations cheatcode

[clabby]

Component

Forge

Describe the feature you would like

Several Layer 2s, including Optimism, allocate many proxies etc. in the genesis file. For example, take Base Mainnet's 8.76MB genesis file.

While it is possible to deploy all of these contracts manually in a test file's setUp function, it is slow, cumbersome, and rather easy to accidentally break parity. A solution to make this process easier for authors of test suites that would like to locally allocate the same accounts that are in the L2 genesis file is to add a simple cheatcode which loads a JSON file with account allocations inside of it into the in-memory revm journal.

This cheatcode can re-use the type defined in ethers-rs for the GenesisAccount when deserializing the allocs JSON, and the basic structure of the file would be HashMap<Address, GenesisAccount>.

Desired Usage

contract MyTest is Test {
    function setUp() public {
        vm.loadAllocs("./path/to/allocs.json");

        // After the cheatcode is invoked, the accounts will have been committed to the revm journal and accessible
        // within the environment.
    }
}

Additional context

n/a

[Evalir]

Closed by #6101 / #6207