Update tests/pass/shims/time-with-isolation.rs

Author: pvdrz

tests/pass/shims/time-with-isolation.rs

@@ -28,7 +28,7 @@ fn main() {
     let diff = now2.duration_since(now1);
     assert_eq!(now1 + diff, now2);
     assert_eq!(now2 - diff, now1);
-    assert_eq!(diff.as_micros());
+    duration_sanity(diff);
 
     test_sleep();
 }