Solana program test: Optional problem of field serialization
As programmers, they test instructions for Solana, you encountered a problem with the program test series. In particular, the test instrument «Sola-test program does not series account data when the field is set to» absence «.
The problem lies in the way the Library of the «Program Test» manages optional fields during serialization. In a specific case, it seems that the determination of the «absence» field instead of «certain (value)» causes a failure of the serialization.
For example, the code
To demonstrate this problem, create a simple example of a structured account:
`Rust
Myaccount structure {
Name: string,
}
Introduce myaccount {
FN New (name: String) -> Self {
Myaccount {name}
}
fn set_name (& mute self, name: string) {
Self.name = name;
}
}
In this example, we define the structure of «Myaccount with the optional name of the» name «field.
test code
To test the problem of serialization, you can use the following code:
`Rust
Use solar_program_test :: {run_test, account_key};
Use solar_program_test :: program_tests;
#[test]
fn my_account_seriasis () {
Or I move my accounts = vec! [];
Let programs_id = "-ID";
Lete public_ky = "public-cey";
// Create an optional field
Let name = some ("John doe");
// initiates the account structure with the value for the name field (specific value)
Let account = Myaccount :: new (name);
// Add an account to the account vector
Cont.Push (account);
Run_test (& program_id and public_key, | _, ctx | {
// Set an optional field instead of one page (values) and check the failure of the serialization
Program_tests :: set_optional_field (ctx, program_id, "my_account", name, false) .Nwrap ();
// Check if the Serialization failed with the code 3004 (code: 3004)
Provide! (ctx.read_data (& program_id and public_key) == none);
// update your account to reflect Serialized data changes
Accounts [0] .et_name (name);
});
}
Explanation
In this test, we create an optional «name» field and initiate it. Then we set the variable «My_acuntable to a specific value (or» some («john doe»)), but instead of using this value, we use «lack». When launching tests of the `program_tests, function :: Set_optional_field tries to serve the account of the account when the optional field is set to «absence» and fails with code 3004. This error indicates the problem of serialization.
Application
The «Sola-Program test» library has a problem that prevents the optional optional field from the optional field, determining a specific error (code: 3004). To solve this problem, you need to make sure you use the correct value for the optional field during the serialization of the account data. In a specific case, you can check it by checking the serialization failure code and checking if the correct value for the optional field is set.
Recommendations
To solve this problem, I recommend adding «none» control in the_tests program :: set_optional_fieldbefore trying to serve the account data. You can do this using the "unnap_or or an alternative solution, such as the use of the default value, if the name TO (())`. In addition, you can examine why the serialization failure code is produced and look for related problems in other parts of the program.
I hope it helps to explain the problem! If you have any other questions or need further tips, don’t hesitate to ask.