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Foundry

Chainlink supports Foundry testing for Solidity based on the Solidity version.

  • < 0.8.0 Hardhat tests only
  • 0.8.x Hardhat and Foundry tests
  • > 0.9.0 Foundry tests only

New projects should use Foundry but existing ones can keep using Hardhat if they want to; we will not be forcing any teams to rewrite their existing test suite.

Installation

Please see the official docs for the latest installation guide

CI

The Foundry CI will build, run tests and check the gas usage of all test functions against the version controlled .gas-snapshot file. This snapshot should always be up-to-date and can be generated by running make snapshot, and alias for forge snapshot --match-test _gas. We only track gas for tests that have the _gas suffix as to not introduce too much noise in the snapshot file. This will create a snapshot file in the current working dir, please make sure that you are in the root chainlink directory.

Configuration

Foundry config lives in foundry.toml in the root, the docs can be found here. The remapping of libraries, both from Foundry and NPM packages, is done in remapping.txt.