@Override
  Iterable<ImmutableTable<Character, Integer, String>> getTestInstances() {
    return ImmutableList.<ImmutableTable<Character, Integer, String>>of(SPARSE, DENSE);
  }

  public void testCellSet() {
    for (ImmutableTable<Character, Integer, String> testInstance : getTestInstances()) {
      assertEquals(CELLS, testInstance.cellSet());
    }
  }

  public void testValues() {

  public final void testClear() {
    for (Table<Character, Integer, String> testInstance : getTestInstances()) {
      assertThrows(UnsupportedOperationException.class, () -> testInstance.clear());
    }
  }

  public final void testPut() {
    for (Table<Character, Integer, String> testInstance : getTestInstances()) {

  private static final ImmutableTable<Character, Integer, String> INSTANCE = ImmutableTable.of();

  @Override
  Iterable<ImmutableTable<Character, Integer, String>> getTestInstances() {
    return ImmutableSet.of(INSTANCE);
  }

  public void testHashCode() {
    assertEquals(0, INSTANCE.hashCode());
  }

  public void testEqualsObject() {

    assertEquals(1, testTable.size());
  }

  public void testValues() {
    assertThat(testTable.values()).contains("blah");
  }

  @Override
  Iterable<ImmutableTable<Character, Integer, String>> getTestInstances() {
    return ImmutableSet.of(testTable);
  }