initMapWithNullValue();
    assertNull(
        "put(present, null) should return the associated value (null)",
        getMap().put(getKeyForNullValue(), null));
    expectContents(createArrayWithNullValue());
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES})
  @CollectionSize.Require(absent = ZERO)
  public void testPut_replaceNullValueWithNonNullSupported() {

    return array;
  }

  /**
   * @return an array of the proper size with {@code null} as the value of the middle element.
   */
  protected Entry<K, V>[] createArrayWithNullValue() {
    Entry<K, V>[] array = createSamplesArray();
    int nullValueLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullValueLocation];
    array[nullValueLocation] = mapEntry(oldEntry.getKey(), null);

      entries.next();
    }
    return entries.next();
  }

  /** @return an array of the proper size with {@code null} as the value of the middle element. */
  protected Entry<K, V>[] createArrayWithNullValue() {
    Entry<K, V>[] array = createSamplesArray();
    int nullValueLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullValueLocation];
    array[nullValueLocation] = entry(oldEntry.getKey(), null);

    initMapWithNullValue();
    assertNull(
        "put(present, null) should return the associated value (null)",
        getMap().put(getKeyForNullValue(), null));
    expectContents(createArrayWithNullValue());
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES})
  @CollectionSize.Require(absent = ZERO)
  public void testPut_replaceNullValueWithNonNullSupported() {

      entries.next();
    }
    return entries.next();
  }

  /** @return an array of the proper size with {@code null} as the value of the middle element. */
  protected Entry<K, V>[] createArrayWithNullValue() {
    Entry<K, V>[] array = createSamplesArray();
    int nullValueLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullValueLocation];
    array[nullValueLocation] = entry(oldEntry.getKey(), null);

    Multimap<K, V> withNull = multimap();
    new EqualsTester()
        .addEqualityGroup(original)
        .addEqualityGroup(
            withNull, getSubjectGenerator().create((Object[]) createArrayWithNullValue()))
        .testEquals();
  }

  @CollectionSize.Require(absent = ZERO)
  public void testNotEqualsEmpty() {
    new EqualsTester()
        .addEqualityGroup(multimap())

    Multimap<K, V> withNull = multimap();
    new EqualsTester()
        .addEqualityGroup(original)
        .addEqualityGroup(
            withNull, getSubjectGenerator().create((Object[]) createArrayWithNullValue()))
        .testEquals();
  }

  @CollectionSize.Require(absent = ZERO)
  public void testNotEqualsEmpty() {
    new EqualsTester()
        .addEqualityGroup(multimap())

  }

  @MapFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testForEach_nullValues() {
    initMapWithNullValue();
    List<Entry<K, V>> expectedEntries = asList(createArrayWithNullValue());
    List<Entry<K, V>> entries = new ArrayList<>();
    getMap().forEach((k, v) -> entries.add(entry(k, v)));
    assertEqualIgnoringOrder(expectedEntries, entries);
  }

  }

  @MapFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testForEach_nullValues() {
    initMapWithNullValue();
    List<Entry<K, V>> expectedEntries = asList(createArrayWithNullValue());
    List<Entry<K, V>> entries = new ArrayList<>();
    getMap().forEach((k, v) -> entries.add(entry(k, v)));
    Helpers.assertEqualIgnoringOrder(expectedEntries, entries);
  }

  }

  @MapFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testCreateWithNullValueSupported() {
    initMapWithNullValue();
    expectContents(createArrayWithNullValue());
  }

  @MapFeature.Require(absent = ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testCreateWithNullValueUnsupported() {