public void Can_calculate_sibling_index(uint row, uint indexAtRow, uint?expectedSiblingIndex)
{
if (expectedSiblingIndex == null)
{
Assert.Throws <ArgumentOutOfRangeException>(() => BaselineTree.GetSiblingIndexAtRow(row, indexAtRow));
}
else
{
BaselineTree.GetSiblingIndexAtRow(row, indexAtRow).Should().Be(expectedSiblingIndex.Value);
BaselineTree.GetSiblingIndexAtRow(row, expectedSiblingIndex.Value).Should().Be(indexAtRow);
}
}