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Solana Program Test: Serialization Issue with Optional Field
As a developer of Solana testing guidelines, you have encountered an issue with serialization of your program tests. Specifically, the « solana-program-test » tool fails to serialize account information when the field is set to « None ».
The issue lies in how the « program-test » library handles optional fields in serialization. In your case, it seems that setting the field to « None » instead of « Some(value) » causes the serialization to fail.
Example Code
To demonstrate this issue, let’s create a simple example account structure:
struct 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 a « MyAccount » structure with an optional field « name ».
Test Code
You can test the serialization issue using the following code:
use solana_program_test::{run_test, account_key};
use solana_program_test::program_tests;
#[test]
fn my_account_serialization() {
let mut accounts = vec![];
let program_id = "your program ID";
let public_key = "public key";
// Create an optional field
let name = Some("John Doe");
// Initialize the account structure with the name field value (some value)
let account = MyAccount::new(name);
// Add the account to the account vector
accounts.push(account);
run_test(&program_id, &public_key, |_, ctx| {
// Set optional field to None instead of Some(value) and check for serialization failure
program_tests::set_optional_field(ctx, program_id, "my_account", name, false).unwrap();
// Verify that serialization failed with code 3004 (code: 3004)
assert!(ctx.read_data(&program_id, &public_key) == None);
// Update account to reflect changes in serialized data
accounts[0].set_name(name);
});
}
Explanation
In this test, we create an optional field « name » and initialize it with a value. We then set the « my_account » variable to some value (which is « Some(« John Doe »)’), but instead of using this value, we use « None ». When running the program tests, the « program_tests::set_optional_field » function tries to serialize the account information when the optional field is set to « None », and it fails with code 3004. This error indicates a serialization issue.
Conclusion
There is an issue in the « solana-program-test » library that prevents the optional field from being set to « None », which causes the specified error (code: 3004). To resolve this issue, make sure that you are using the correct value for the optional field when serializing the account information. In your case, you can verify this by checking the serialization error code and making sure that the optional field is set to the correct value.
Recommendations
To fix this issue, I recommend adding a check for the None value program_tests::set_optional_field function before attempting to serialize the account information. You can do this by using the unwrap_or method or an alternative solution, such as using the default value if name is Some(()). You may also want to investigate why the serialization error code is occurring and look for related issues in other parts of your program.
I hope this helps clarify things! If you have any additional questions or need further guidance, please feel free to ask.