diff --git a/Spatial_searching/test/Spatial_searching/remove.cpp b/Spatial_searching/test/Spatial_searching/remove.cpp
index 825c7b03fff..4b054e35f24 100644
--- a/Spatial_searching/test/Spatial_searching/remove.cpp
+++ b/Spatial_searching/test/Spatial_searching/remove.cpp
@@ -25,5 +25,6 @@ int main()
     t.insert(Point(i,-i));
   for(int i=0;i<1000;++i)
     t.remove(Point(i,-i));
+  assert(t.empty());
   t.print();
 }