Ethereum: Unknown selection error (0x98296c54) in BIGTTokenTest.t.sol

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Ethereum: Unknown selector error (0x98296c54) in BIGTTokenTest.t.sol

An unexpected error occurred in the latest iteration of the popular smart contract testing environment testbobBalance'. The specific problem is related to the "Unknown Selector" error that occurs when running a test using theBIGTTokenTestcontract.

This unknown selector error occurs when requesting access to theVmCallsfunction in thetestbobBalancetest. The error message "Unknown selector 0x98296c54 for VmCalls" indicates that there was a problem with the contract function call.

When studying the code, it turned out that thetestbobBalancefunction in theBIGTTokenTestcontract contains a logical error. In particular, the test tries to call the functionVmCallswith an argument that is not defined in the current scope.

solidity

In this line of code,VmCallsis called with the argument0x00000000000000000000000000000000000000000000000000000000000000000000000. However, the function of theVmCallscontract expects a specific argument, which will most likely be a value stored in the current scope. In this case, it seems that the functionVmCallshas not been given a specific argument.

Solution
To solve this problem, the test author seems to have overlooked an important detail: theVmCallscontract function requires certain arguments to be passed during function calls. To correct this error, you must provide the correct argument, which will most likely be a value stored in the current scope.
Here's an updated version of the code snippet with the corrected line:
solidity
function testbobBalance() public {
// ... (second code)
VmCalls(vb, 0x000000000000000000000000000000000000000000000000000000000000000000000000, 0x0000000000000000000000000000000000000000000000000000000000000000000);
}

By adding the second argument 0x00000000000000000000000000000000000000000000000000000000000000000000, we ensure that the correct value is passed to theVmCallsfunction, eliminating the unknown selector error.

"Unknown selector error (0x98296c54) for VmCalls" intestbobBalance’ was fixed by fixing a logic error in the contract code. By understanding the problem and implementing the necessary fix, developers can ensure that their smart contracts will 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. Before making any changes to the production code, it is extremely important to check for any bugs or issues in the production test environment.

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