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roll-fork.md

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rollFork

Signature

// roll the _active_ fork to the given block
function rollFork(uint256 blockNumber) external;
// roll the _active_ fork to the block in which the transaction was mined it and replays all previously executed transactions
function rollFork(bytes32 transaction) external;
// Same as `rollFork(uint256 blockNumber)` but uses the fork corresponding to the `forkId`
function rollFork(uint256 forkId, uint256 blockNumber) external;
// Same as `rollFork(bytes32 transaction)` but uses the fork corresponding to the `forkId`
function rollFork(uint256 forkId, bytes32 transaction) external;

Description

Sets block.number. If a fork identifier is passed as an argument, it will update that fork, otherwise it will update the currently active fork.

If a transaction hash is provided, it will roll the fork to the block the transaction was mined in and replays all previously executed transactions.

Examples

Set block.number for the currently active fork:

uint256 forkId = vm.createFork(MAINNET_RPC_URL);
vm.selectFork(forkId);

assertEq(block.number, 15_171_037); // as of time of writing, 2022-07-19 04:55:27 UTC

vm.rollFork(15_171_057);

assertEq(block.number, 15_171_057);

Set block.number for the fork identified by the passed forkId argument:

uint256 optimismForkId = vm.createFork(OPTIMISM_RPC_URL);

vm.rollFork(optimismForkId, 1_337_000);

vm.selectFork(optimismForkId);

assertEq(block.number, 1_337_000);

SEE ALSO