How to get last block information in a Hardhat Waffle test?
I checked here https://hardhat.org/hardhat-network/#json-rpc-methods-support
And here https://hardhat.org/hardhat-network/reference/
it seems eth_blockNumber is what I need, but how can I use it to get the last block timestamp?
If you are using @nomiclabs/hardhat-ethers (and you are if you have @nomiclabs/hardhat-waffle installed and imported in your config), then:
const latestBlock = await hre.ethers.provider.getBlock("latest")
Notice that ethers.provider is something added by the @nomiclabs/hardhat-ethers plugin, it's not part of ethers itself. It's a provider that is connected to the network that Hardhat is using.
To answer:
how can I use it to get the last block timestamp?
And adding to the previous answer to get the timestamp just read the property from the returned block information:
const timeStamp = (await ethers.provider.getBlock("latest")).timestamp
If you're using Hardhat and doing tests, you can get the timestamp of a block where a specific transaction was included
it('should succeed - verify the timestamp when a token was minted', function () {
const accounts = await ethers.getSigners()
//mint something ~ the contract stores the block.timestamp during the mint
expect(yourTx = await yourContract.connect(accounts[1]).mintNFT(
randomParameters,
moreRandomParameters,
{value: yourMintPrice})).to.be.ok
//Print timestamp from the specific block where a TX was included
const foo = await ethers.provider.getBlock(yourTx.blockHash!)
console.log(timestamp of the tx ${foo.timestamp})
//this function returns the token details stored in the contract
const mintedToken = await yourContract.getTokenDetails(mintedTokenId)
console.log(tokenstoredTimestamp ${mintedToken.timestamp})
expect(mintedToken.timestamp).to.be.equal(foo.timestamp)
});
The previous answers are correct, this is just a different approach to get a bit more control if you are running parallel tests and your functions are time sensitive
