public void EmptyArray()
{
TreeNode expected = null;
Assert.Equal(expected, ArrayToTreeKata.ArrayToTree(new int[] {}));
}
public void ArrayWithMultipleElements()
{
TreeNode expected = new TreeNode(17, new TreeNode(0, new TreeNode(3), new TreeNode(15)), new TreeNode(-4));
Assert.Equal(expected, ArrayToTreeKata.ArrayToTree(new int[] { 17, 0, -4, 3, 15 }));
}