romantic/tests

use romantic::Roman;

#[test]
fn test_readme_roman() {
  let roman = Roman::default();

  assert_eq!(roman.to_string(2022).unwrap(), "MMXXII");
  assert_eq!(roman.from_str::<i32>("MMXXII").unwrap(), 2022);

  // The default Roman numeral has a maximum of 3999.
  assert!(roman.to_string(4000).is_err());
}

#[test]
fn test_readme_custom() {
  // The order of characters in the array determines their value.
  // Here, A equals 1 and B equals 5.
  let custom = Roman::new(&['A', 'B']);

  assert_eq!(custom.to_string(6).unwrap(), "BA");
  assert_eq!(custom.from_str::<i32>("BA").unwrap(), 6);

  // With only 2 characters, the maximum value you can get is 8
  // (the equivalent of VIII). To increase the maximum range, use
  // more characters.
  assert!(custom.to_string(9).is_err());
}