diff --git a/tests/controls/itemcontainertest.cpp b/tests/controls/itemcontainertest.cpp
index ffc49d0197..7c28b1a0f9 100644
--- a/tests/controls/itemcontainertest.cpp
+++ b/tests/controls/itemcontainertest.cpp
@@ -71,6 +71,7 @@ void ItemContainerTestCase::Count()
     wxItemContainer * const container = GetContainer();
 
     CPPUNIT_ASSERT(container->IsEmpty());
+    WX_ASSERT_FAILS_WITH_ASSERT( container->GetString(0) );
 
     wxArrayString testitems;
     testitems.Add("item 0");
@@ -95,6 +96,7 @@ void ItemContainerTestCase::Count()
     container->Insert(testitems, 1);
 
     CPPUNIT_ASSERT_EQUAL(5, container->GetCount());
+    WX_ASSERT_FAILS_WITH_ASSERT( container->GetString(10) );
 }
 
 void ItemContainerTestCase::ItemSelection()