Solana program test: problem of serialization with optional field
As developer test instructions on Solana, you encountered a problem with the serialization of the program test. In particular, the Solana-Program-Testtool is unable to serialize the account data when a field is set up on anyone '.
The problem lies in the way the program test library manages optional fields during serialization. In your specific case, it seems that the setting of a field on "none" instead of "a little (value)" causes the failure of serialization.
Example code
To demonstrate this problem, we create a simple example account structure:
Rust
Stuc Myaccount {
Name: string,
}
Impl MyACCount {
Fn New (Name: String) -> Self {
Myaccount {Name}
}
FN Set_Name (& Mut Self, Name: String) {
self.name = name;
}
}
In this example, we define amycacountwith an optional 'name' structure.
Test code
To test the problem of serialization, you can use the following code:
Rust
Use Solana_program_test :: {run_test, account_key};
Use Solana_program_test :: Program_tests;
#[test]
Fn My_acCount_Serialization () {
Let Mut Account = VEC! [];
Let program_id = "Your-Program-ID";
Let public_key = "Public-Key";
// Create an optional field
Be the name = some ("John Doe");
// Initialize the account structure with a value for the name field (a value)
Let Account = Myaccount :: New (Name);
// Add the account to the account vector
Accounts.push (account);
Run_test (& Program_id, & Public_key, | _, CTX | {
// Sets the optional field on none instead of a little (value) and checks the failure of serialization
Program_TESTS :: Set_optional_field (CTX, program_id, "My_acount", name, false) .unwrap ();
// Check that serialization has not succeeded with the code 3004 (code: 3004)
Assert! (CTX.Read_data (& Program_id, & Public_key) == None);
// Update the account to reflect the changes to serialized data
Account [0] .set_name (name);
});
}
Explanation
In this test, we create an optional fieldname 'and initialize with a value. So we set the variableMy_acCount ‘on a value (which is some (” John Doe “)), but instead of using that value, we use "none". When performing the program tests, theprogram_tests :: set_optional_field function tries to serial the account data when the optional field is set to” nobody “and cannot with the code 3004. This error indicates a problem of serialization.
Conclusion
The Solana-Program-Testbookshop has a problem that prevents the setting of an optional field on none from being properly serialized, causing the specified error (code: 3004). To solve this problem, it is necessary to make sure to use the correct value for the optional field during the serialist the account data. In your specific case, it is possible to check it by checking the error code of serialization and checking that the correct value is set for the optional field.
Advice
To solve this problem, I advise you to add a check for the valuenobody ‘in the program program_tests :: Set_optional_fieldbefore trying to serve the account data. You can do it using theunwrap_oror an alternative solution such as the use of a predefined value if it is some (()) `. In addition, you may want to investigate why the bankruptcy code of serialization is taking place and look for related problems in other parts of the program.
I hope this helps to clarify the problem! If you have further questions or you need further information, do not hesitate to ask.
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