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Hardhat’s network forking lets developers spin up a local node that mirrors a live blockchain snapshot. This article walks through configuring, running, and verifying a forked network, and discusses trade‑offs and best practices.
Forking lets you run integration tests against a pinned copy of mainnet state. This guide covers configuration, impersonation, archive requirements, and how to avoid flaky tests.
An architecture note covering Hardhat's network forking: requirements, minimal design, trust boundaries, operational checks, failure modes, and triggers for redesign.
Hardhat Network allows for integration testing without production credentials by utilizing the hardhat_impersonateAccount method and network forking. This enables the simulation of complex interactions using the state of a live blockchain while keeping transactions local. A design challenge arises when comparing gas estimation behavior between a clean local
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