1 extern crate wasm_bindgen_test;
2 
3 use instant::Instant;
4 use std::time::Duration;
5 use wasm_bindgen_test::*;
6 
7 wasm_bindgen_test_configure!(run_in_browser);
8 // run these tests using: wasm-pack test --chrome --headless -- --features wasm-bindgen
9 
10 #[wasm_bindgen_test]
test_instant_now()11 fn test_instant_now() {
12     let now = Instant::now();
13     assert!(now.elapsed().as_nanos() > 0);
14 }
15 
16 #[wasm_bindgen_test]
test_duration()17 fn test_duration() {
18     let now = Instant::now();
19     let one_sec = Duration::from_secs(1);
20     assert!(now.elapsed() < one_sec);
21 }
22 
23 // Duration::new will overflow when you have u64::MAX seconds and one billion nanoseconds.
24 // <https://doc.rust-lang.org/std/time/struct.Duration.html#method.new>
25 const ONE_BILLION: u32 = 1_000_000_000;
26 
27 #[wasm_bindgen_test]
test_checked_add()28 fn test_checked_add() {
29     let now = Instant::now();
30 
31     assert!(now.checked_add(Duration::from_millis(1)).is_some());
32     assert_eq!(
33         None,
34         now.checked_add(Duration::new(u64::MAX, ONE_BILLION - 1))
35     );
36 }
37 
38 #[wasm_bindgen_test]
test_checked_sub()39 fn test_checked_sub() {
40     let now = Instant::now();
41 
42     assert!(now.checked_sub(Duration::from_millis(1)).is_some());
43     assert!(now
44         .checked_sub(Duration::new(u64::MAX, ONE_BILLION - 1))
45         .is_none());
46 }
47