diff --git a/tests/double_priority_queue.rs b/tests/double_priority_queue.rs
index 4d3b280..85c699a 100644
--- a/tests/double_priority_queue.rs
+++ b/tests/double_priority_queue.rs
@@ -343,6 +343,25 @@ mod doublepq_tests {
         }
     }
 
+    #[test]
+    fn drain() {
+        use std::collections::hash_map::RandomState;
+        let mut queue = DoublePriorityQueue::<i32, i32, RandomState>::default();
+
+        for i in 0..7 {
+            queue.push(i, i);
+        }
+
+        let previous_capacity = queue.capacity();
+        queue.drain();
+
+        assert_eq!(queue.len(), 0);
+        assert_eq!(queue.capacity(), previous_capacity);
+        assert_eq!(queue.pop_min(), None);
+        assert_eq!(queue.pop_max(), None);
+    }
+
+
     #[test]
     fn extend() {
         let mut pq = DoublePriorityQueue::new();
diff --git a/tests/priority_queue.rs b/tests/priority_queue.rs
index 9acf62d..127591f 100644
--- a/tests/priority_queue.rs
+++ b/tests/priority_queue.rs
@@ -327,6 +327,23 @@ mod pqueue_tests {
         }
     }
 
+    #[test]
+    fn drain() {
+        use std::collections::hash_map::RandomState;
+        let mut queue = PriorityQueue::<i32, i32, RandomState>::default();
+
+        for i in 0..7 {
+            queue.push(i, i);
+        }
+
+        let previous_capacity = queue.capacity();
+        queue.drain();
+
+        assert_eq!(queue.len(), 0);
+        assert_eq!(queue.capacity(), previous_capacity);
+        assert_eq!(queue.pop(), None);
+    }
+
     #[test]
     fn extend() {
         let mut pq = PriorityQueue::new();