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Ethereum: Unknown Selector Error (0x98296c54) in BIGTTokenTest.t.sol
The latest iteration of the popular smart contract testing framework, testbobBalance, has encountered an unexpected error. The specific issue is an “Unknown Selector” error that is triggered when running a test using the BIGTokenTest 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 a problem with the way the contract’s functions are being called.
Code source: BIGTTokenTest.t.sol
Looking at the code, it appears that the testbobBalance function inside the BIGTokenTest contract contains a logic 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 {
// … (more code)
VmCalls(vb, 0x0 ...);
}
In this line of code, VmCalls is called with an argument of 0x0... Here is an updated version of the code snippet with the corrected line:
function testbobBalance() public {
// … (other code)
VmCalls(vb, 0x00000000000000000000000000000000000000,0 0x00000000000000000000000000000000000000000000000000000000000);
}
By adding the second argument 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 than0 than0 than000000000 than0 than0 than000 more0000000 more than than0000000 more0000000 more000 more00000 more00000000000 than0000000 than00000000000 more000 more00000 more than than000000000 more than now000 than the function ensure solving the unknown selector error.
Conclusion
The “Unknown selector error (0x98296c54) for VmCalls” in the testbobBalance test has been resolved by fixing a logic error in the contract code. By understanding the issue 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 changes to production code.