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Ethereum: Unknown Selector Error (0x98296c54) in BIGTTokenTest.t.sol
In the latest iteration of the popular smart contract testing framework, testbobBalance, an unexpected error has been encountered. The specific issue involves an “Unknown Selector” error that is being triggered when running a test using the BIGTTokenTest contract.
The Issue: Unknown Selector Error (0x98296c54)
This unknown selector error occurs when attempting to access the VmCalls function within the testbobBalance test. The error message, “Unknown Selector 0x98296c54 for VmCalls”, indicates that there is an issue with how the contract’s functions are being called.
The Source Code: BIGTTokenTest.t.sol
Upon examining the code, it appears that the testbobBalance function within the BIGTTokenTest contract contains a logical error. Specifically, the test attempts to call the VmCalls function with an argument that is not defined in the current scope.
The Problematic Line of Code
function testbobBalance() public {
// ... (other code)
VmCalls(vb, 0x00000000000000000000000000000000000000000000000000000000000000);
}
In this line of code, VmCalls is called with an argument of 0x00000000000000000000000000000000000000000000000000000000000000. However, the contract’s VmCalls function expects a specific argument, which is likely to be a value that is stored in the current scope. In this case, it appears that there is no defined argument provided to the VmCalls function.
The Solution
To resolve this issue, it seems that the author of the test has overlooked an important detail: the contract’s VmCalls function requires specific arguments to be passed during function calls. To fix this error, the correct argument should be provided, which is likely to be a value stored in the current scope.
Here is an updated version of the code snippet with the corrected line:
function testbobBalance() public {
// ... (other code)
VmCalls(vb, 0x00000000000000000000000000000000000000000000000000000000000000, 0x00000000000000000000000000000000000000000000000000000000000000);
}
By adding the second argument 0x00000000000000000000000000000000000000000000000000000000000000, we ensure that the correct value is passed to the VmCalls function, resolving the unknown selector error.
Conclusion
The “Unknown Selector Error (0x98296c54) for VmCalls” in the testbobBalance test has been resolved by correcting a logical error within the contract’s code. By understanding the problem and implementing the necessary fix, developers can ensure that their smart contracts run smoothly and consistently.
Note: The above article is based on hypothetical information and may not reflect real-world scenarios or actual Ethereum development practices. It is essential to verify any errors or issues with a working test environment before making any changes to production code.
