public void SiblingTest()
{
Paragraph para = new Paragraph();
Run r1 = para.AppendChild(new Run());
Bold b1 = r1.AppendChild(new RunProperties()).AppendChild(new Bold());
Text t1 = r1.AppendChild(new Text());
BookmarkStart bkStart = para.AppendChild(new BookmarkStart());
Run r2 = para.AppendChild(new Run());
r2.AppendChild(new Text());
BookmarkEnd bkEnd = para.AppendChild(new BookmarkEnd());
Run r3 = para.AppendChild(new Run());
Assert.Null(para.PreviousSibling <Paragraph>());
Assert.Null(r1.PreviousSibling <BookmarkStart>());
Assert.Same(r1, bkStart.PreviousSibling <Run>());
Assert.Same(bkStart, r2.PreviousSibling <BookmarkStart>());
Assert.Same(bkStart, bkEnd.PreviousSibling <BookmarkStart>());
Assert.Same(bkStart, r3.PreviousSibling <BookmarkStart>());
Assert.Null(para.NextSibling <Paragraph>());
Assert.Null(r2.NextSibling <BookmarkStart>());
Assert.Same(r2, bkStart.NextSibling <Run>());
Assert.Same(bkEnd, r1.NextSibling <BookmarkEnd>());
Assert.Same(bkEnd, bkStart.NextSibling <BookmarkEnd>());
Assert.Same(bkEnd, r2.NextSibling <BookmarkEnd>());
}
