*/
    protected Maps(final Map<K, V> map) {
        this.map = map;
    }

    /**
     * {@link Map}にキーと値を追加します。
     *
     * @param key
     *            <code>Map</code>に追加されるキー
     * @param value
     *            <code>Map</code>に追加される値
     * @return このインスタンス自身
     */
    public Maps<K, V> $(final K key, final V value) {
        map.put(key, value);
        return this;

    assertEquals("1", map.remove("a"));
    assertNull(map.remove("b"));
  }

  public void testTransformEqualityOfMapsWithNullValues() {
    Map<String, @Nullable String> underlying = Maps.newHashMap();
    underlying.put("a", null);
    underlying.put("b", "");

    Map<String, Boolean> map =
        Maps.transformValues(
            underlying,

    assertEquals("1", map.remove("a"));
    assertNull(map.remove("b"));
  }

  public void testTransformEqualityOfMapsWithNullValues() {
    Map<String, @Nullable String> underlying = Maps.newHashMap();
    underlying.put("a", null);
    underlying.put("b", "");

    Map<String, Boolean> map =
        Maps.transformValues(
            underlying,

    for (Map<C, V> row : rowMap().values()) {
      if (row.containsValue(value)) {
        return true;
      }
    }
    return false;
  }

  @Override
  public boolean contains(@CheckForNull Object rowKey, @CheckForNull Object columnKey) {
    Map<C, V> row = Maps.safeGet(rowMap(), rowKey);
    return row != null && Maps.safeContainsKey(row, columnKey);
  }

  @Override

    map.put("quux", 3);

    map.remove("quux");
    assertThat(map.entrySet())
        .containsExactly(Maps.immutableEntry("foo", 1), Maps.immutableEntry("bar", 2))
        .inOrder();
  }

  public void testInsertionOrderAfterForcePut() {
    BiMap<String, Integer> map = HashBiMap.create();
    map.put("foo", 1);
    map.put("bar", 2);
    map.put("quux", 3);

    map.forcePut("quux", 1);

    map.put("quux", 3);

    map.remove("quux");
    assertThat(map.entrySet())
        .containsExactly(Maps.immutableEntry("foo", 1), Maps.immutableEntry("bar", 2))
        .inOrder();
  }

  public void testInsertionOrderAfterForcePut() {
    BiMap<String, Integer> map = HashBiMap.create();
    map.put("foo", 1);
    map.put("bar", 2);
    map.put("quux", 3);

    map.forcePut("quux", 1);

    for (Map<C, V> row : rowMap().values()) {
      if (row.containsValue(value)) {
        return true;
      }
    }
    return false;
  }

  @Override
  public boolean contains(@CheckForNull Object rowKey, @CheckForNull Object columnKey) {
    Map<C, V> row = Maps.safeGet(rowMap(), rowKey);
    return row != null && Maps.safeContainsKey(row, columnKey);
  }

  @Override

  Map<K, V> entriesOnlyOnRight();

  /**
   * Returns an unmodifiable map containing the entries that appear in both maps; that is, the
   * intersection of the two maps.
   */
  Map<K, V> entriesInCommon();

  /**
   * Returns an unmodifiable map describing keys that appear in both maps, but with different
   * values.
   */
  Map<K, ValueDifference<V>> entriesDiffering();

  /**

    @Override
    protected Map<AnEnum, String> create(Entry<AnEnum, String>[] entries) {
      Map<AnEnum, String> map = Maps.newHashMap();
      for (Entry<AnEnum, String> entry : entries) {
        map.put(entry.getKey(), entry.getValue());
      }
      return Maps.immutableEnumMap(map);
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // suite

import com.google.common.base.Functions;
import java.util.Map;

/**
 * Tests for {@link Maps#transformValues(Map, Function)}.
 *
 * @author Isaac Shum
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public class MapsTransformValuesTest extends AbstractMapsTransformValuesTest {
  @Override
  protected Map<String, String> makeEmptyMap() {
    return Maps.transformValues(Maps.<String, String>newHashMap(), Functions.<String>identity());