### Question:
MutableEntrySet extends AbstractEntrySet<K, V> { @Override public Iterator<Entry<K, V>> iterator() { return map().iterator(); } MutableEntrySet(final TrieMap<K, V> map); @Override void clear(); @Override Iterator<Entry<K, V>> iterator(); @Override @SuppressWarnings("checkstyle:parameterName") boolean remove(final Object o);  }### Answer:
@Test public void testIterator() { final Iterator<Entry<String, String>> it = set.iterator(); assertTrue(it.hasNext()); assertEquals(new SimpleImmutableEntry<>(KEY, VALUE), it.next()); assertFalse(it.hasNext()); }