in src/content/lines.rs [420:437]
fn test_justify() -> anyhow::Result<()> {
let mut test = vec![
vec!["test"].try_into()?,
Line::default(),
vec!["ok"].try_into()?,
];
test.justify();
let expected = vec![
vec!["test"].try_into()?,
vec![" ".repeat(4)].try_into()?,
vec!["ok", " "].try_into()?,
];
assert_eq!(test, expected);
Ok(())
}