test/jdk/java/util/Map/MapWithCollisionsProviders.java

*** 191,200 ****
--- 191,202 ----
                               new Hashtable<>(), keys, val));
          cases.add(createCase("IdentityHashMap with " + desc,
                               new IdentityHashMap<>(), keys, val));
          cases.add(createCase("TreeMap with " + desc,
                               new TreeMap<>(), keys, val));
+         cases.add(createCase("Descending TreeMap with " + desc,
+                              new TreeMap<>().descendingMap(), keys, val));
          cases.add(createCase("WeakHashMap with " + desc,
                               new WeakHashMap<>(), keys, val));
          cases.add(createCase("ConcurrentHashMap with " + desc,
                               new ConcurrentHashMap<>(), keys, val));
          cases.add(createCase("ConcurrentSkipListMap with " + desc,