checkNotNull(rowKey);
    Integer rowIndex = rowKeyToIndex.get(rowKey);
    if (rowIndex == null) {
      return emptyMap();
    } else {
      return new Row(rowIndex);
    }
  }

  private final class Row extends ArrayMap<C, @Nullable V> {
    final int rowIndex;

    Row(int rowIndex) {
      super(columnKeyToIndex);
      this.rowIndex = rowIndex;
    }

    @Override

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    assertThat(input).isEqualTo(expectedOutput);
  }

  private static void testReverse(
      double[] input, int fromIndex, int toIndex, double[] expectedOutput) {
    input = Arrays.copyOf(input, input.length);
    Doubles.reverse(input, fromIndex, toIndex);
    assertThat(input).isEqualTo(expectedOutput);
  }

  public void testReverseIndexed() {
    testReverse(new double[] {}, 0, 0, new double[] {});

      return listIterator(0);
    }

    @Override
    public ListIterator<T> listIterator(int index) {
      return standardListIterator(index);
    }

    @Override
    public List<T> subList(int fromIndex, int toIndex) {
      return standardSubList(fromIndex, toIndex);
    }
  }

  @AndroidIncompatible // test-suite builders
  public static Test suite() {

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    assertThat(input).isEqualTo(expectedOutput);
  }

  private static void testSortDescending(
      byte[] input, int fromIndex, int toIndex, byte[] expectedOutput) {
    input = Arrays.copyOf(input, input.length);
    SignedBytes.sortDescending(input, fromIndex, toIndex);
    assertThat(input).isEqualTo(expectedOutput);
  }

  public void testSortDescendingIndexed() {

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    Ints.reverse(input);
    assertThat(input).isEqualTo(expectedOutput);
  }

  private static void testReverse(int[] input, int fromIndex, int toIndex, int[] expectedOutput) {
    input = Arrays.copyOf(input, input.length);
    Ints.reverse(input, fromIndex, toIndex);
    assertThat(input).isEqualTo(expectedOutput);
  }

  public void testReverseIndexed() {
    testReverse(new int[] {}, 0, 0, new int[] {});

    Bytes.reverse(input);
    assertThat(input).isEqualTo(expectedOutput);
  }

  private static void testReverse(byte[] input, int fromIndex, int toIndex, byte[] expectedOutput) {
    input = Arrays.copyOf(input, input.length);
    Bytes.reverse(input, fromIndex, toIndex);
    assertThat(input).isEqualTo(expectedOutput);
  }

  public void testReverseIndexed() {
    testReverse(new byte[] {}, 0, 0, new byte[] {});