openzeppelin-contracts/test/helpers/advanceToBlock.js

function advanceBlock () {
  return new Promise((resolve, reject) => {
    web3.currentProvider.sendAsync({
      jsonrpc: '2.0',
      method: 'evm_mine',
      id: Date.now(),
    }, (err, res) => {
      return err ? reject(err) : resolve(res);
    });
  });
}

module.exports = {
  advanceBlock,
};