Iterator<Entry<K, V>> iterator = map.entrySet().iterator();
    Entry<K, V> firstEntry = iterator.next();
    Entry<K, V> secondEntry = iterator.next();
    K key = secondEntry.getKey();
    SortedMap<K, V> subMap = map.tailMap(key);
    V value = getValueNotInPopulatedMap();
    subMap.put(key, value);
    assertEquals(secondEntry.getValue(), value);
    assertEquals(map.get(key), value);

    }

    @Override
    public NavigableMap<K, V> tailMap(K fromKey, boolean inclusive) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate().tailMap(fromKey, inclusive);
    }

    @Override
    public SortedMap<K, V> tailMap(K fromKey) {
      return tailMap(fromKey, true);
    }

    @Override
    public Comparator<? super K> comparator() {

    assertFalse(navigableMap.headMap(a.getKey()).containsKey(a.getKey()));
  }

  @CollectionSize.Require(absent = ZERO)
  public void testTailMapInclusive() {
    assertTrue(navigableMap.tailMap(a.getKey()).containsKey(a.getKey()));
  }

  public void testHeadMap() {
    List<Entry<K, V>> entries =
        copyToList(
            getSubjectGenerator()

   */
  @Override
  public ImmutableSortedMap<K, V> tailMap(K fromKey) {
    return tailMap(fromKey, true);
  }

  /**
   * This method returns a {@code ImmutableSortedMap}, consisting of the entries whose keys are
   * greater than (or equal to, if {@code inclusive}) {@code fromKey}.
   *
   * <p>The {@link SortedMap#tailMap} documentation states that a submap of a submap throws an

    assertFalse(navigableMap.headMap(a.getKey()).containsKey(a.getKey()));
  }

  @CollectionSize.Require(absent = ZERO)
  public void testTailMapInclusive() {
    assertTrue(navigableMap.tailMap(a.getKey()).containsKey(a.getKey()));
  }

  public void testHeadMap() {
    List<Entry<K, V>> entries =
        copyToList(
            getSubjectGenerator()

    assertEquals(2, row.size());
    assertEquals(1, row.tailMap(15).size());
  }

  public void testSubRowClearAndPut() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    SortedMap<Integer, Character> row = (SortedMap<Integer, Character>) table.row("foo");
    SortedMap<Integer, Character> subRow = row.tailMap(2);
    assertEquals(ImmutableMap.of(1, 'a', 3, 'c'), row);

    }

    @Override
    public NavigableMap<K, V2> tailMap(@ParametricNullness K fromKey) {
      return tailMap(fromKey, true);
    }

    @Override
    public NavigableMap<K, V2> tailMap(@ParametricNullness K fromKey, boolean inclusive) {
      return transformEntries(fromMap().tailMap(fromKey, inclusive), transformer);
    }

    @CheckForNull

    }

    @Override
    public NavigableMap<K, V2> tailMap(@ParametricNullness K fromKey) {
      return tailMap(fromKey, true);
    }

    @Override
    public NavigableMap<K, V2> tailMap(@ParametricNullness K fromKey, boolean inclusive) {
      return transformEntries(fromMap().tailMap(fromKey, inclusive), transformer);
    }

    @CheckForNull

  }

  @CollectionSize.Require(absent = ZERO)
  public void testTailMapExclusive() {
    assertFalse(navigableMap.tailMap(a.getKey(), false).containsKey(a.getKey()));
  }

  @CollectionSize.Require(absent = ZERO)
  public void testTailMapInclusive() {
    assertTrue(navigableMap.tailMap(a.getKey(), true).containsKey(a.getKey()));
  }

            .containsExactlyElementsIn(expected.headMap(key, inclusive).entrySet())
            .inOrder();
        assertThat(navigableMap.tailMap(key, inclusive).entrySet())
            .containsExactlyElementsIn(expected.tailMap(key, inclusive).entrySet())
            .inOrder();
        assertThat(navigableMap.headMap(key, inclusive).descendingMap().entrySet())