in src/content/line.rs [229:243]
fn test_pad_line_right() {
let mut test = Line(vec!["test".try_into().unwrap(), "ok".try_into().unwrap()]);
let mut new_test: Line = test.clone();
test.0.push(" ".repeat(4).try_into().unwrap());
new_test.pad_right(4);
assert_eq!(test, new_test);
new_test.pad_right(6);
test.0.push(" ".repeat(6).try_into().unwrap());
assert_eq!(test, new_test);
new_test.pad_right(10);
test.0.push(" ".repeat(10).try_into().unwrap());
assert_eq!(test, new_test);
}