Ethereum: Timeout Error in Hardhat Stationing Test with Chainlink VRF and Automation on Sepolia Network

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Ethereum: Hardhat Readiness Test Timeout Error with Chainlink VRF and Automation on Sepolia Network

As a developer working on decentralized applications (dApps) built on Ethereum, it is not uncommon to encounter issues when testing and deploying smart contracts. In this article, we will explore an issue that can arise when running readiness tests for your lottery smart contract using Hardhat with the help of Chainlink VRF (verifiable random functions) and automation on Sepolia Network.

The Problem

The issue originates from a timeout error that occurs during a Hardhat readiness test. Specifically, the test is supposed to integrate Chainlink VRF and Chainlink Keepers live, but fails due to an unrecoverable timeout. This issue can be caused by several factors, including:

• Insufficient network connectivity

• Improper Chainlink VRF subscription or guardian configurations

• Incorrect test setup or configuration

Problem Test

To diagnose and resolve this issue, we will perform a step-by-step analysis of the Hardhat readiness test. We will focus on the Chainlink VRF integration, which is crucial for simulating real-world scenarios.

• Update Hardhat to the latest version: Make sure you are running the latest version of Hardhat, as updates often fix known issues.

• Verify Network Connectivity: Make sure your network is connected and configured correctly before attempting to run the test.

• Verify Chainlink VRF Subscription: Verify that you have a valid Chainlink VRF subscription on the Sepolia Network (the testnet used by Hardhat). You can check this in the hardhat.config.js file in chainlinks.vrf. If your subscription is not active or has expired, please update it accordingly.

• Check Guardians Configuration – Make sure your guardians configuration is set correctly to enable VRF-based randomness.

Automated Testing with Sepolia Network

To automate testing and improve the reliability of our smart contracts, we will use Sepolia Network’s automated testing capabilities. We will create a separate test suite for the lottery contract using the @hardhat/autocollector and @hardhat/chainlink packages.

Here are the steps to replicate this setup:

• Create a new Hardhat project with Sepolia Network support.

• Install the required dependencies (@hardhat/autocollector, @hardhat/chainlink) in your package.json file.

• Configure Chainlink VRF and guardians in the hardhat.config.js file under chainlinks.vrf.

• Create an automated test suite for the lottery contract using @hardhat/autocollector and @hardhat/chainlink.

Sample code

Here is some sample code to get you started:

const { Autocollector, Chainlink } = require('@hardhat/autocollector');
const { HardhatRuntimeEnvironment, ProviderClient } = require '@nomiclabs/hardhat-provider';
// Sepolia Network Configuration
const sepoliaConfig = {
// Your Sepolia Network API credentials here
};
module.exports = {
providers: [
new ProviderClient(sepoliaConfig),
],
getNamedAccounts: () => ['SepoliaNetwork'],
};

Conclusion

In this article, we have demonstrated how to troubleshoot and resolve a timeout error in Hardhat readiness tests integrating with Chainlink VRF live and automation on Sepolia Network. By following the steps outlined above and using automated testing capabilities, you can ensure that your smart contracts are reliable and working as expected.

Always remember to update your dependencies and test configurations to maintain compatibility with evolving blockchain technologies. If you encounter further issues or have specific questions, feel free to ask!

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