/** Maps with same contents are equal */
public void testEquals() {
ConcurrentNavigableMap map1 = map5();
ConcurrentNavigableMap map2 = map5();
assertEquals(map1, map2);
assertEquals(map2, map1);
map1.clear();
assertFalse(map1.equals(map2));
assertFalse(map2.equals(map1));
}
/** clear removes all pairs */
public void testClear() {
ConcurrentNavigableMap map = map5();
map.clear();
assertEquals(map.size(), 0);
}