programming-rust-examples/fern_sim/tests/unfurl.rs

// tests/unfurl.rs - Fiddleheads unfurl in sunlight

#![warn(rust_2018_idioms)]
#![allow(elided_lifetimes_in_paths)]

use fern_sim::Terrarium;
use std::time::Duration;

#[test]
fn test_fiddlehead_unfurling() {
    let mut world = Terrarium::load("tests/unfurl_files/fiddlehead.tm");
    assert!(world.fern(0).is_furled());
    let one_hour = Duration::from_secs(60 * 60);
    world.apply_sunlight(one_hour);
    assert!(world.fern(0).is_fully_unfurled());
}