[Test]
public void ShouldBuildListNodeFromIntArray()
{
    var sut = new AddTwoNumbers_Problem();

    var input = new[] {2, 4, 3};
    var node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

    input = new[] {5, 6, 4};
    node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

    input = new[] {9, 9, 9};
    node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

    input = new[] {0, 0, 0, 1};
    node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

    input = new[] {7, 0, 8};
    node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

    input = new[] {1};
    node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

    input = new[] {0};
    node = sut.BuildList(input);
    input.ShouldBe(sut.Output(node));

}