void AddListFrom(IReadOnlyList <int> collection, IReadOnlyList <int> items, bool reverse, bool isMutated, IReadOnlyList <int> expected)
        {
            // Arrange
            var left    = new DoubleLinkedList <int>(collection);
            var version = left.Version;
            var right   = new DoubleLinkedList <int>(items);

            // Act
            left.AddLastFrom(right, reverse);

            // Assert
            left.Count.Should().Be(expected.Count);
            if (isMutated)
            {
                left.Version.Should().NotBe(version);
            }
            else
            {
                left.Version.Should().Be(version);
            }
            left.EnumerateForward().Should().Equal(expected);
            left.EnumerateReversed().Should().Equal(expected.Reverse());
            right.Count.Should().Be(0);
        }