[Fact]
public void OneToFive()
{
    var result = DivideUp(7);
    // if 1,2,3,4,5
    Assert.Equal(new List<int> { 1, 5, 3, 4, 2 }, result);
}

[Fact]
public void OneToSeven()
{
    var result = DivideUp(7);
    // if 1,2,3,4,5,6,7 
    Assert.Equal(new List<int> { 1, 7, 4, 5, 2, 6, 3 }, result);
}

[Fact]
public void OneToEight()
{
    var result = DivideUp(8);
    // if 1,2,3,4,5,6,7,8 
    Assert.Equal(new List<int> { 1, 8, 4, 6, 2, 7, 5, 3 }, result);
}

[Fact]
public void OneToNine()
{
    var result = DivideUp(9);
    // if 1,2,3,4,5,6,7,8,9 
    Assert.Equal(new List<int> { 1, 9, 5, 7, 3, 8, 6, 4, 2 }, result);
}

[Fact]
public void OneToEleven()
{
    var result = DivideUp(11);
    // if 1,2,3,4,5,6,7,8,9,10,11
    Assert.Equal(new List<int> { 1, 11, 6, 8, 3, 9, 7, 4, 2, 10, 5 }, result);
}