enumSizeMap = new EnumMap(Size.class);
enumSizeMap.put(Size.Middle, 1);
enumSizeMap.put(Size.Big, null);
set = enumSizeMap.entrySet();
Object[] array = set.toArray();
assertEquals("Wrong length", 2, array.length); //$NON-NLS-1$
Map.Entry entry = (Map.Entry) array[0];
assertEquals("Wrong key", Size.Middle, entry.getKey()); //$NON-NLS-1$
assertEquals("Wrong value", 1, entry.getValue()); //$NON-NLS-1$