Object second = it.next();
Object firstValue = sm.get(first);
Object fromKeyValue = sm.get(fromKey);
Object secondValue = sm.get(second);
SortedMap sub = sm.tailMap(fromKey);
assertEquals(sm.size() - 1, sub.size());
assertEquals(true, sm.containsKey(first));
assertEquals(false, sub.containsKey(first));
assertEquals(true, sm.containsValue(firstValue));
assertEquals(false, sub.containsValue(firstValue));