test/java/util/Collections/EmptyNavigableMap.java

@@ -263,11 +263,11 @@
             assertThrows(
                 () -> {
                     navigableMap.subMap(last, true, first, false);
                 },
                 IllegalArgumentException.class, description
-                + ": Must throw IllegalArgumentException when fromElement is not less then then toElement.");
+                + ": Must throw IllegalArgumentException when fromElement is not less than toElement.");
 
         navigableMap.subMap(first, true, last, false);
     }
 
     @Test(dataProvider = "NavigableMap<?,?>", dataProviderClass = EmptyNavigableMap.class)