previous-version.js

// mine 100 blocks
await network.provider.send("hardhat_mine", ["0x64"]);

// mine a new block one hour in the future
await network.provider.send(
  "evm_increaseTime",
  "0xe10"
);
await network.provider.send("hardhat_mine");

// take and revert a snapshot
const snapshotId = await network.provider.send("evm_snapshot");
await network.provider.send("evm_revert", [snapshotId]);