assertThat(Booleans.concat(ARRAY_FALSE)).isEqualTo(ARRAY_FALSE);
    assertThat(Booleans.concat(ARRAY_FALSE)).isNotSameInstanceAs(ARRAY_FALSE);
    assertThat(Booleans.concat(EMPTY, ARRAY_FALSE, EMPTY)).isEqualTo(ARRAY_FALSE);
    assertThat(Booleans.concat(ARRAY_FALSE, ARRAY_FALSE, ARRAY_FALSE))
        .isEqualTo(new boolean[] {false, false, false});
    assertThat(Booleans.concat(ARRAY_FALSE, ARRAY_FALSE_TRUE))

    assertThat(Booleans.concat(ARRAY_FALSE)).isEqualTo(ARRAY_FALSE);
    assertThat(Booleans.concat(ARRAY_FALSE)).isNotSameInstanceAs(ARRAY_FALSE);
    assertThat(Booleans.concat(EMPTY, ARRAY_FALSE, EMPTY)).isEqualTo(ARRAY_FALSE);
    assertThat(Booleans.concat(ARRAY_FALSE, ARRAY_FALSE, ARRAY_FALSE))
        .isEqualTo(new boolean[] {false, false, false});
    assertThat(Booleans.concat(ARRAY_FALSE, ARRAY_FALSE_TRUE))

  }

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

  /**

    resetContainer();
  }

  /** @return an array of the proper size with {@code null} inserted into the middle element. */
  protected E[] createArrayWithNullElement() {
    E[] array = createSamplesArray();
    array[getNullLocation()] = null;
    return array;
  }

  protected void initCollectionWithNullElement() {
    E[] array = createArrayWithNullElement();

    Object[] array = new Object[12 + others.length];
    array[0] = e1;
    array[1] = e2;
    array[2] = e3;
    array[3] = e4;
    array[4] = e5;
    array[5] = e6;
    array[6] = e7;
    array[7] = e8;
    array[8] = e9;
    array[9] = e10;
    array[10] = e11;
    array[11] = e12;
    System.arraycopy(others, 0, array, 12, others.length);
    return construct(array);

    }
  }

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

  protected V getValueForNullKey() {

    final String[] array = {"a", "b", "c"};

    return new UnmodifiableListIterator<String>() {
      int i;

      @Override
      public boolean hasNext() {
        return i < array.length;
      }

      @Override
      public String next() {
        if (!hasNext()) {
          throw new NoSuchElementException();
        }
        return array[i++];
      }

      @Override

    assertThat(Shorts.toArray(bytes)).isEqualTo(array);
    assertThat(Shorts.toArray(shorts)).isEqualTo(array);
    assertThat(Shorts.toArray(ints)).isEqualTo(array);
    assertThat(Shorts.toArray(floats)).isEqualTo(array);
    assertThat(Shorts.toArray(longs)).isEqualTo(array);
    assertThat(Shorts.toArray(doubles)).isEqualTo(array);
  }

    assertThat(Floats.toArray(bytes)).isEqualTo(array);
    assertThat(Floats.toArray(shorts)).isEqualTo(array);
    assertThat(Floats.toArray(ints)).isEqualTo(array);
    assertThat(Floats.toArray(floats)).isEqualTo(array);
    assertThat(Floats.toArray(longs)).isEqualTo(array);
    assertThat(Floats.toArray(doubles)).isEqualTo(array);
  }

  @SuppressWarnings("DoNotCall")
  public void testRemove() {
    final String[] array = {"a", "b", "c"};

    Iterator<String> iterator =
        new UnmodifiableIterator<String>() {
          int i;

          @Override
          public boolean hasNext() {
            return i < array.length;
          }

          @Override
          public String next() {
            if (!hasNext()) {