The roll
cheatcode sets the block.number
// Obtain our cheat code contract reference.
IStdCheats cheats = CheatCodes(0x7109709ECfa91a80626fF3989D68f67F5b1DD12D);
// Change value and verify.
cheats.roll(7);
assert(block.number == 7);
cheats.roll(9);
assert(block.number == 9);
function roll(uint256) external;