test.rs

use std::env;

#[test]
fn test_lots_lots_of_rectangles() {
    let size: usize = env::var("SIZE").unwrap_or("10".to_string()).parse().unwrap();
    let line: String = vec!["+"; size].into_iter().collect();
    let lines: Vec<&str> = vec![&line; size];
    assert_eq!(count(&lines), (size * (size - 1) / 2).pow(2));
}