Testing: Impersonate Account API

Overview

• Currently, mainnet-fork capabilities are limited by not having a way to unlock accounts. We should add a method to the TestProviderAPI for unlocking accounts.

I am trying to make my tests have accounts that start off with ERC20s.

Specification

class TestProviderAPI:
    def impersonate_account(self, address):
        raise NotImplementedError(...)  # Override if this feature is supported

Dependencies

Include links to any open issues that must be resolved before this feature can be implemented.

Will also require updating Hardhat plugin

[unparalleled-js]

Yes, I think that all makes sense and works out nicely.

So would this be a usage example?

@pytest.fixture
def account_with_dai(accounts, chain):
    dev_account = accounts[0]
    impersonated_account = chain.impersonate_account("0xwhatever")
    impersonated_account.transfer(dev_account, "100 DAI")
    return dev_account

[fubuloubu]

Also have config-driven impersonated accounts, something like :

test:
    unlocked_accounts:
      - name: DaiHolder
         address: 0x12..45

Also, change the accounts test fixture to include key-accessible unlocked accounts:

def test_accounts(accounts):
    acct = accounts[0]
    dai_acct = accounts["DaiHolder"] 

I think this type of feature fits better with #306