add test reset_timer_and_drop

tokio/src/runtime/time/tests/mod.rs

@@ -202,6 +202,28 @@ fn reset_future() {
     })
 }
 
+#[test]
+fn reset_timer_and_drop() {
+    model(|| {
+        let rt = rt(false);
+        let handle = rt.handle();
+
+        let start = handle.inner.driver().clock().now();
+
+        for _ in 0..2 {
+            let entry = TimerEntry::new(handle.inner.clone(), start + Duration::from_millis(10));
+            pin!(entry);
+
+            let _ = entry
+                .as_mut()
+                .poll_elapsed(&mut Context::from_waker(futures::task::noop_waker_ref()));
+
+            entry.as_mut().reset(start + Duration::from_secs(1), true);
+            drop(entry);
+        }
+    });
+}
+
 #[cfg(not(loom))]
 fn normal_or_miri<T>(normal: T, miri: T) -> T {
     if cfg!(miri) {