crypt-config 0.2.2

A crypt module that encrypt/decrypt json data based on the configuration. This might be used as a layer before saving data in Mongo DB or after fetching the data from the DB in order to decrypt them.
Documentation 
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extern crate serde;
extern crate serde_json;

use serde::{Deserialize, Serialize};

use crate::error::CryptResult;

#[derive(Serialize, Deserialize)]
struct Version {
  //    #[serde(default, skip_serializing)]
  version: String
}

#[allow(dead_code)]
pub fn get_config_version(json: &str) -> CryptResult<String> {
  let v: Version = serde_json::from_str(json)?;

  Ok(v.version)
}

#[cfg(test)]
mod tests {
  use super::get_config_version;
  #[test]
  fn version_valid() {
    let ver = "1.0.0";
    let json = r#"
        {
            "version": "1.0.0"
        }"#;

    let out = get_config_version(&json).unwrap();

    assert_eq!(ver, out);
  }

  #[test]
  fn allow_unknown_fields() {
    let ver = "1.0.0";
    let json = r#"
        {
            "version": "1.0.0",
            "unknown": "0.0.0"
        }"#;

    let out = get_config_version(&json).unwrap();

    assert_eq!(ver, out);
  }

  #[test]
  fn version_missing() {
    let json = r#"{}"#;

    let out = get_config_version(&json);

    assert!(out.is_err(), "Lack of version field in json should return error")
  }
}