fix underflow when running cargo wasi test

dylanhart · Feb 3, 2024 · 673315b · 673315b
1 parent c220598
commit 673315b
Showing 1 changed file with 9 additions and 6 deletions.
diff --git a/src/time.rs b/src/time.rs
@@ -168,11 +168,14 @@ mod tests {
 
  #[test]
  fn truncates_at_unix_epoch() {
- let before_epoch = SystemTime::UNIX_EPOCH - Duration::from_secs(100);
- assert!(before_epoch < SystemTime::UNIX_EPOCH);
- assert_eq!(
- Ulid::from_datetime(before_epoch).datetime(),
- SystemTime::UNIX_EPOCH
- );
+ if let Some(before_epoch) = SystemTime::UNIX_EPOCH.checked_sub(Duration::from_secs(100)) {
+ assert!(before_epoch < SystemTime::UNIX_EPOCH);
+ assert_eq!(
+ Ulid::from_datetime(before_epoch).datetime(),
+ SystemTime::UNIX_EPOCH
+ );
+ } else {
+ // Prior dates are not representable (e.g. wasm32-wasi)
+ }
  }
 }