Ethereum: local VRF testing issues, error: virtual machine exception while processing transaction: returned with user error “InsufficientBalance()”
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Ethereum: Local VRF Testing Issues and Reverse Transactions
As part of our ongoing learning from Patrick Collin’s course, we recently upgraded to use VRF (Virtual Random Function) v2.5 in our local Ethereum test environment using Hardhat.
In this article, I will outline some key observations from our experience with local VRF testing and highlight a critical issue that we encountered.
Upgrading to VRF V2.5
We successfully upgraded to VRF v2.5 after making the necessary changes to the contract code and configuring our test environment using Hardhat. Our initial tests showed promising results, but as we progressed, we encountered an unexpected error.
Error: VM exception while processing transaction: ‘InsufficientBalance’ returned with custom error
After running a series of tests, including some simulations and scenario-based tests, we encountered the following error:
“Error: VM exception while processing transaction: ‘InsufficientBalance’ returned with custom error”
This error occurred when we attempted to process transactions that exceeded our available balance.
Issue: Canceled transactions and insufficient funds
After analyzing the error message and reviewing our test logs, we found that the issue was related to an insufficient funds error. The error was caused by trying to spend money from an account that did not have sufficient balance.
Current status of VRF local testing
In summary, we have upgraded to VRF v2.5 and are currently running Hardhat tests. Although 13 out of 14 tests were successful, our most recent test failed due to resource-constrained errors in the on-premises VRF test environment.
This issue highlights some key considerations when using on-premises VRF:
- Asset Management
: When working with VRF 2.5, it is important to manage your assets carefully to avoid unexpected errors like this.
- VRF Configuration: Ensure that you have configured 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 range of scenarios, including transactions exceeding your available balance.
Next Steps
We plan to conduct further investigation and explore possible solutions to resolve this issue. We will be working on:
- Reviewing our contract code for potential vulnerabilities or misconfigurations.
- Testing various scenarios and extreme cases to ensure our VRF on-premise test environment is robust.
- Improving our baseline management strategies to prevent similar issues in the future.
Stay tuned for more updates on this project as we continue to navigate the intricacies of using VRF v2.5 on-premise with Hardhat.
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