Expose fs_permissions for Solidity Test in Hardhat config

[kanej]

Initially reported on Telegram: https://t.me/c/2274028871/184

To allow for vm.readFile, Foundry requires one to add something like

fs_permissions = [
  { access = "read-write", path = "./" },
]

to one's foundry.toml. How do we achieve this in Hardhat 3?

Setting fs_permissions for the readFile cheatcode is supported in the underlying Solidity Test library (i.e. EDR's Solidity Test). However, it is not currently being exposed in hardhat.config.{js,ts}.

We need to update Hardhat 3's Solidity Test config to allow specifying fs permissions.

[galargh]

This is already possible via the solidityTest.fsPermissions.read, solidityTest.fsPermissions.write and solidityTest.fsPermissions.readWrite config properties.

Here's a minimal example:

{
  "solidityTest": {
    "fsPermissions": {
      "readWrite": [
        "./"
      ]
    },
  }
}

I'm going to close this as resolved ✅