diff --git a/tests/tinyvec.rs b/tests/tinyvec.rs
index 6295458..7a642ee 100644
--- a/tests/tinyvec.rs
+++ b/tests/tinyvec.rs
@@ -23,8 +23,11 @@ fn TinyVec_swap_remove() {
 
 #[test]
 fn TinyVec_capacity() {
-  let tv: TinyVec<[i32; 10]> = Default::default();
-  assert_eq!(tv.capacity(), 10);
+  let mut tv: TinyVec<[i32; 1]> = Default::default();
+  assert_eq!(tv.capacity(), 1);
+  tv.move_to_the_heap();
+  tv.extend_from_slice(&[1, 2, 3, 4]);
+  assert_eq!(tv.capacity(), 4);
 }
 
 #[test]