}

  @Override
  protected SortedMap<String, Integer> makeEmptyMap() {
    return new SimpleForwardingSortedMap<>(
        new TreeMap<String, Integer>(Ordering.<String>natural().nullsFirst()));
  }

  @Override
  protected SortedMap<String, Integer> makePopulatedMap() {
    SortedMap<String, Integer> sortedMap = makeEmptyMap();
    sortedMap.put("one", 1);
    sortedMap.put("two", 2);

  @Override
  protected abstract SortedMap<K, V> makeEmptyMap() throws UnsupportedOperationException;

  @Override
  protected abstract SortedMap<K, V> makePopulatedMap() throws UnsupportedOperationException;

  @Override
  protected SortedMap<K, V> makeEitherMap() {
    try {
      return makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return makeEmptyMap();
    }
  }

  @Override
  protected abstract SortedMap<K, V> makeEmptyMap() throws UnsupportedOperationException;

  @Override
  protected abstract SortedMap<K, V> makePopulatedMap() throws UnsupportedOperationException;

  @Override
  protected SortedMap<K, V> makeEitherMap() {
    try {
      return makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return makeEmptyMap();
    }
  }

  }

  @Override
  Table<String, Integer, Character> makeTable() {
    return ArrayTable.create(asList("foo", "bar", "dog"), asList(1, 2, 3));
  }

  @Override
  protected Map<String, Map<Integer, Character>> makeEmptyMap() {
    throw new UnsupportedOperationException();
  }

@NullUnmarked
public class RegularImmutableMapWithUnhashableValuesMapInterfaceTest
    extends AbstractImmutableMapMapInterfaceTest<Integer, UnhashableObject> {
  @Override
  protected Map<Integer, UnhashableObject> makeEmptyMap() {
    return ImmutableMap.of();
  }

  @Override
  protected Map<Integer, UnhashableObject> makePopulatedMap() {
    Unhashables unhashables = new Unhashables();

abstract class AbstractImmutableBiMapMapInterfaceTest<K, V> extends MapInterfaceTest<K, V> {
  AbstractImmutableBiMapMapInterfaceTest() {
    super(false, false, false, false, false);
  }

  @Override
  protected Map<K, V> makeEmptyMap() {
    throw new UnsupportedOperationException();
  }

  private static final Joiner JOINER = Joiner.on(", ");

  @Override
  protected final void assertMoreInvariants(Map<K, V> map) {

  public ForMapMultimapAsMapImplementsMapTest() {
    super(true, true, true);
  }

  @Override
  protected Map<String, Collection<Integer>> makeEmptyMap() {
    Map<String, Integer> map = new HashMap<>();
    return Multimaps.forMap(map).asMap();
  }

  @Override
  protected Map<String, Collection<Integer>> makePopulatedMap() {

  public TreeBasedTableRowMapInterfaceTest() {
    super(false, false, true, true, true);
  }

  @Override
  protected SortedMap<String, String> makeEmptyMap() {
    TreeBasedTable<String, String, String> table = TreeBasedTable.create();
    table.put("a", "b", "c");
    table.put("c", "b", "a");
    table.put("a", "a", "d");
    return table.row("b");
  }

  }

  @Override
  Table<Integer, String, Character> makeTable() {
    return ArrayTable.create(asList(1, 2, 3), asList("foo", "bar", "dog"));
  }

  @Override
  protected Map<String, Map<Integer, Character>> makeEmptyMap() {
    throw new UnsupportedOperationException();
  }

@GwtCompatible
@NullUnmarked
public class ImmutableBiMapMapInterfaceTest
    extends AbstractImmutableBiMapMapInterfaceTest<String, Integer> {
  @Override
  protected Map<String, Integer> makeEmptyMap() {
    return ImmutableBiMap.of();
  }

  @Override
  protected Map<String, Integer> makePopulatedMap() {
    return ImmutableBiMap.of("one", 1, "two", 2, "three", 3);
  }

  @Override