[Dev Tools] Impersonating account when using anvil-zksync with mainnet fork

[cehali]

Team or Project

RedStone

ZK chain

Era

Environment

Mainnet

Select the Dev Tool you are using

Hardhat Plugins

Provide the version of the tool (if applicable)

No response

Provide a brief description of the functionality you're trying to implement and the issue you are running into.

I'd like to run tests on a mainnet fork using Hardhat together with an anvil-zksync node. These tests involve contract upgrades, which require impersonation functionality.

However, when attempting to impersonate accounts, we encounter the following error: [Account address] is not managed by the node you are connected to..

This appears to be caused by a check in the hardhat-zksync-ethers package, specifically this line. The code currently checks whether the chain ID matches the local network ID (240). When using a mainnet fork, the chain ID is 324 (zkSync mainnet), which causes the impersonation feature to fail, even though we are running on a local forked environment.

Repo Link (Optional)

No response

Additional Details

No response

[bxpana]

Appreciate the post, will check on this and get back to you.

[dutterbutter]

You can pass --chain-id to anvil-zksync to override.

[bxpana]

@cehali going to mark this as answered, but if that doesn't work for some reason you can unmark it as answered and we'll get alerted

[cehali]

sure, I was using --chain-id in the wrong place (after fork command) 🤦

[cehali]

We still have an issue with another if in the same function https://github.com/matter-labs/hardhat-zksync/blob/main/packages/hardhat-zksync-ethers/src/utils.ts#L256. What is the expected value of result here? I tried to run hardhat_impersonateAccount before hardhat_stopImpersonatingAccount to trigger different response but without success

[dutterbutter]

hey @cehali any chance you can share reproduction steps? Will make it quicker to debug / resolve. If you cannot share the actual test, perhaps a minimal reproduction is possible. If it also helpful here is an e2e test that makes use of hardhat impersonation for reference: https://github.com/matter-labs/anvil-zksync/blob/d9e9c4eb5bc9522723509a903022483d1f8df5ca/e2e-tests/test/hardhat-apis.test.ts#L62