public void insert_before_in_the_middle_with_a_parent()
{
a.AppendChild(b);
a.AppendChild(d);
d.InsertBefore(c);
A_should_Have_B_then_C_then_D();
}
public void insert_before_as_the_first_child()
{
a.AppendChild(c);
a.AppendChild(d);
c.InsertBefore(b);
A_should_Have_B_then_C_then_D();
}
public void insert_before_with_no_parent()
{
b.InsertBefore(c);
b.PreviousSibling.ShouldBeTheSameAs(c);
c.NextSibling.ShouldBeTheSameAs(b);
b.NextSibling.ShouldBeNull();
c.PreviousSibling.ShouldBeNull();
b.Parent.ShouldBeNull();
c.Parent.ShouldBeNull();
}