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Docs /
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Testing /
Tweaking the Blockchain

Icon LinkProducing Blocks

You can force-produce blocks using the produceBlocks helper to achieve an arbitrary block height. This is especially useful when you want to do some testing regarding transaction maturity. 
const provider = await Provider.create(FUEL_NETWORK_URL);
 
const block = await provider.getBlock('latest');
if (!block) {
  throw new Error('No latest block');
}
const { time: timeLastBlockProduced } = block;
 
const amountOfBlocksToProduce = 3;
const producedBlockHeigh = await provider.produceBlocks(amountOfBlocksToProduce);
 
const producedBlock = await provider.getBlock(producedBlockHeigh.toNumber());
 
expect(producedBlock).toBeDefined();
 
const oldest: Date = DateTime.fromTai64(timeLastBlockProduced);
const newest: Date = DateTime.fromTai64(producedBlock?.time || DateTime.TAI64_NULL);
 
expect(newest >= oldest).toBeTruthy();

Icon LinkProducing Blocks With Custom Timestamps

You can also produce blocks with a custom block time using the produceBlocks helper by specifying the second optional parameter. 
const lastBlockTimestamp = DateTime.fromTai64(latestBlock.time).toUnixMilliseconds();
const latestBlockNumber = await provider.produceBlocks(3, lastBlockTimestamp + 1000);