--- old/test/jdk/java/util/concurrent/ConcurrentMap/ConcurrentModification.java	2019-04-24 17:10:49.138515263 +0100
+++ new/test/jdk/java/util/concurrent/ConcurrentMap/ConcurrentModification.java	2019-04-24 17:10:48.746505994 +0100
@@ -89,6 +89,21 @@
                 }
             }
         } catch (Throwable t) {unexpected(t);}
+
+        try {
+            if (m instanceof ConcurrentSkipListMap) {
+                m.clear();
+                check(m.isEmpty());
+                m.put(1,2);
+                check(m.size() == 1);
+                ConcurrentSkipListMap mc = ((ConcurrentSkipListMap) m).clone();
+                check(m.size() == 1);
+                check(mc.size() == 1);
+                m.put(2,3);
+                check(m.size() == 2);
+                check(mc.size() == 1);
+            }
+        } catch (Throwable t) {unexpected(t);}
     }
 
     public static void main(String[] args) {