You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: secret.rs
    path of file: ./repos/neon/proxy/src/scram
    
    the code of the file until where you have to start completion: //! Tools for SCRAM server secret management.

use super::base64_decode_array;
use super::key::ScramKey;

/// Server secret is produced from user's password,
/// and is used through
    
    fn parse_scram_secret() {
        let iterations = 4096;
        let salt = "+/tQQax7twvwTj64mjBsxQ==";
        let stored_key = "D5h6KTMBlUvDJk2Y8ELfC1Sjtc6k9YHjRyuRZyBNJns=";
        let server_key = "Pi3QHbcluX//NDfVkKlFl88GGzlJ5LkyPwcdlN/QBvI=";

        let secret = format!(
            "SCRAM-SHA-256${iterations}:{salt}${stored_key}:{server_key}",
            iterations = iterations,
            salt = salt,
            stored_key = stored_key,
            server_key = server_key,
        );

        let parsed = ServerSecret::parse(&secret).unwrap();
        assert_eq!(parsed.iterations, iterations);
        assert_eq!(parsed.salt_base64, salt);

        assert_eq!(base64::encode(parsed.stored_key), stored_key);
        assert_eq!(base64::encode(parsed.server_key), server_key);
    }