I have a smart contract that checks if the actual block number is higher than a fixed one to execute certain functionality and I need to write a unit test to validate that behavior. I’m using RSK in Regtest mode to execute tests and I would need to increment the block number without actually waiting for time to pass.

The smart contract uses a block number, and I need to increment the block number without actually waiting for time to pass.

context('once deployed', function () {
   it('can only be released after cliff', async function () {
     // TODO here I need to increment time or block number
     await this.lockup.release();
   });
)};

How can I do this in a truffle (mocha) test like the one above?

I have a smart contract that checks if the actual block number is higher than a fixed one to execute certain functionality and I need to write a unit test to validate that behavior. I’m using RSK in Regtest mode to execute tests and I would need to increment the block number without actually waiting for time to pass.

The smart contract uses a block number, and I need to increment the block number without actually waiting for time to pass.

context('once deployed', function () {
   it('can only be released after cliff', async function () {
     // TODO here I need to increment time or block number
     await this.lockup.release();
   });
)};

How can I do this in a truffle (mocha) test like the one above?

• javascript
• mocha.js
• rsk

Share Improve this question Follow asked Jan 25, 2021 at 13:01 OwansOwans 1,03766 silver badges1414 bronze badges

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1 Answer 1

Sorted by: Reset to default 10

Quick note, to stress this is not possible in "actual" RSK blockchains (Mainnet and Testnet), as it involves "fake" mining.

However, in Regtest, this is indeed possible:

(1)

Use the evm_mine JSON-RPC method to mine blocks.

function evmMine () {
    return new Promise((resolve, reject) => {
        web3.currentProvider.send({
            jsonrpc: "2.0",
            method: "evm_mine",
            id: new Date().getTime()
            }, (error, result) => {
                if (error) {
                    return reject(error);
                }
                return resolve(result);
            });
    });
};

await evmMine(); // Force a single block to be mined.

This is consistent with the approach used in Ethereum developer tools, e.g. Ganache.

(2)

Use the evm_increaseTime JSON-RPC method to increase time of the block:

function evmIncreaseTime(seconds) {
    return new Promise((resolve, reject) => {
        web3.currentProvider.send({
            method: "evm_increaseTime",
            params: [seconds],
            jsonrpc: "2.0",
            id: new Date().getTime()
          }, (error, result) => {
            if (error) {
                return reject(error);
            }
            return asyncMine().then( ()=> resolve(result));
          });
    }); 
}

await evmIncreaseTime(600); // Force block to be mined such that ~10 minutes has passed