public void Test_SubGrid_RemoveFromParent_Null()
{
// This can't be tested fully as the entire Set/Get subgrid functionality is abstract at this point, and
// RemoveFromParent is part of that abstract workflow. At this level, we will test that no exception occurs
// if the parent relationship is null
SubGridTree tree = new SubGridTree(SubGridTreeConsts.SubGridTreeLevels, 1.0, new SubGridFactory <NodeSubGrid, LeafSubGrid>());
var leafSubgrid = new SubGrid(tree, null, SubGridTreeConsts.SubGridTreeLevels);
leafSubgrid.RemoveFromParent();
leafSubgrid.Parent.Should().BeNull();
// Good!
}