Testing for overflow Ethereum: rust bug
During the enforcement process, it is necessary to thoroughly try our intellectual contracts so that they behave as expected. In this article, we will investigate how to test the overflow for ether transfers using rust and firmness code combination.
Understand the overflow of transmission
Transmission overflow occurs when the transfer value exceeds the maximum permitted operation amount (usually 20 million ether). This can lead to unpredictable behavior, incorrect intellectual logic of the contract or even crashing. In this example, we will try the “deposition” function, which is responsible for the sender of the ether and the mining tokens.
rust code
`Rūdys
// Try the kit to pass overflow Ethereum
Use STD :: Convert :: TRYFROM;
Use “ETERMint ::” Account :: {account, balance};
Use Etherswitch :: Contract :: Contract;
CONST EIP712_domain_Name: & str = “Ethereum domain”;
CONST IP712_TOKEN_TYPE: & str = “Ethereum token type”;
Structloverflowerror {
Cause: string,
}
Imple of
fn of (s: string) -> self {
Transmission Flowerror {Cause: S}
}
}
#[test]
fn test_trnsfer_Overflow () {
// Initialize the contract
Let the contract = contract :: New (0x …).
// Deposit ether and mint chips for sender
contract.deposit (
“0x …”. To_string (),
“0x …”. To_string (),
Eip712_domain_name.to_string (),
EIP712_TOKEN_type.to_string (),
100_000_000.into (),
)
.xpuction (“Failed to put ether and mint chips”);
// Test to pass overflow
Let the balance = account :: from (1) .UNWRAP ();
Propaging! (Balance.balance ()> 20_000_000);
// Try to bring more ether than allowed
contract.deposit (
“0x …”. To_string (),
“0x …”. To_string (),
Eip712_domain_name.to_string (),
EIP712_TOKEN_type.to_string (),
200_000_000.into (),
)
.peect (“Failed to bring more ether”);
// Test to pass overflow
Propaging! (Balance.balance ()> 20_000_000);
// Try mint chips with too much chips
contract.mint (
“0x …”. To_string (),
Eip712_domain_name.to_string (),
EIP712_TOKEN_type.to_string (),
100_000_000.into (),
)
.xpuction (“Failed mint chips”);
// Test to pass overflow
Propaging! (Balance.balance ()> 20_000_000);
}
`
Explanation
In this test set we:
- Initialize the contract using “Agreement :: New”.
- Deposit ether and mint chips for sender.
- Try to bring more ether than allowed (
200_000_000) and check that the residue exceeds maximum value.
- Mint chips with excessive chips (100_000_000) and check that the residue is still over maximum value.
Testing of paranoid use
To check the case of paranoid use, we can add additional statements to ensure:
- The deposit function is correctly managed by the overcrowding conditions.
- All errors that occur when transmission of processing are properly disseminated and indicated as “transmission Flowerror”.
By incorporating these checks, we can confirm the strength of our contract and prevent unexpected behavior.
Conclusion
Transfer overcrowding tests are an essential aspect that ensures the integrity and reliability of Ethereum Smart contracts. Using Rust to write tests and solidarity code to implement the logic of the contract, we can effectively test the cases of paranoid use such as overcrowding.
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