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Ethereum: Problems with local VRF testing, error: VM exception during transaction processing: returned with user error “InsufficientBalance()”

Posted on by chang mr.

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Ethereum: VRF Local Testing Issues and Reverted Transactions

As part of our ongoing learning journey in Patrick Collin’s course, we recently upgraded to use the VRF (Virtual Random Function) v2.5 version in our local Ethereum testing environment using Hardhat.

In this article, I’ll outline some key observations from our experience with VRF local testing and highlight a critical issue that has arisen.

Upgrading to VRF V2.5

Ethereum: VRF local testing issues,Error: VM Exception while processing transaction: reverted with custom error 'InsufficientBalance()'

We successfully upgraded to VRF v2.5 after making the necessary changes to our contract code and configuring our testing environment using Hardhat. Our initial tests showed promising results, but as we progressed further, we encountered an unexpected error.

The Error: VM Exception while processing transaction: reverted with custom error ‘InsufficientBalance’

After running a series of tests, including some simulations and scenario-based tests, we encountered the following error:

“Error: VM Exception while processing transaction: reverted with custom error ‘InsufficientBalance'”

This error occurred when we attempted to process transactions that exceeded our available balance.

The Issue: Reverted Transactions and Insufficient Funds

After analyzing the error message and reviewing our test logs, we discovered that the issue was related to an insufficient funds error. The error was caused by attempting to spend funds from an account that did not have sufficient balances.

Current State of VRF Local Testing

To recap, we have upgraded to VRF v2.5 and are currently running tests with Hardhat. Despite passing 13 out of 14 tests, our most recent test has failed due to insufficient funds errors in the VRF local testing environment.

This issue highlights some critical considerations for using VRF locally:

  • Funds management

    : When working with VRF v2.5, it’s essential to manage your funds carefully to avoid unexpected errors like this one.

  • VRF configuration: Make sure you’re configuring your VRF instance correctly and that the contracts and variables used in your tests are set up properly.

  • Testing scenarios: Develop comprehensive testing strategies that cover various scenarios, including transactions exceeding available balances.

Next Steps

To resolve this issue, we plan to investigate further and explore possible solutions. We’ll be working on:

  • Reviewing our contract code for potential vulnerabilities or misconfigurations.

  • Testing different scenarios and edge cases to ensure our VRF local testing environment is robust.

  • Improving our fund management strategies to prevent similar issues in the future.

Stay tuned for further updates from this project as we continue to navigate the complexities of using VRF v2.5 locally with Hardhat.

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chang mr.