public void RemoveParentTest()
{
// Parent node
HeapNode <float, string> node = new HeapNode <float, string>(0, "Potato");
// Add child, remove parent
HeapNode <float, string> child = new HeapNode <float, string>(2, "Tomato");
node.AddChild(child);
child.RemoveParent();
Assert.IsNull(child.Parent); // Child has no parent
Assert.AreEqual(node.Children.Count, 0); // Node has no children
Assert.IsFalse(node.Children.Contains(child)); // Child is not a child of node
Assert.AreEqual(node.Rank, 0); // Rank reflects number of children
}