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Here is a draft article based on your report:
Ethereum: VRF Local Testing Issues and Reversals
As part of our continuing learning journey with Patrick Collin’s course, we recently upgraded to using VRF (Virtual Random Function) v2.5 in our local Ethereum testing environment using Hardhat.
In this article, I will outline some key insights from our experience with VRF local testing and highlight a critical issue that emerged.
Upgrading to VRF V2.5
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, we encountered an unexpected error.
Error: VM Exception during transaction processing: returned 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 during transaction processing: returned with custom error ‘InsufficientBalance'”
This error occurred when we attempted to process transactions that exceeded our available balance.
Issue: Transactions returned and insufficient funds
After analyzing the error message and reviewing our test logs, we determined that the issue was related to an insufficient funds error. The error was caused by an attempt to spend funds from an account that did not have sufficient balances.
Current Status of Local VRF Testing
To summarize, we have upgraded to VRF v2.5 and are currently testing with Hardhat. Although our latest test passed 13 out of 14 tests, it failed due to insufficient funds in the on-premises VRF test environment.
This issue highlights some critical considerations for on-premises VRF usage:
- Resource Management: When working with VRF v2.5, it is essential that you manage your resources carefully to avoid unexpected errors like this.
- VRF Configuration: Ensure that you configure your VRF instance correctly and that the contracts and variables used in your tests are set up correctly.
- Test Scenarios: Develop comprehensive testing strategies that cover a variety of scenarios, including transactions exceeding available balances.
Next Steps
We plan to continue investigating and exploring possible solutions to resolve this issue. We will be working on:
- Reviewing our contract code for potential vulnerabilities or misconfigurations.
- Testing various scenarios and edge cases to ensure our on-premises VRF test environment is robust.
- Improving our pool management strategies to prevent similar issues in the future.
Stay tuned for more updates from this project as we continue to work through the intricacies of using VRF v2.5 on-premises with Hardhat.
