text: from .k_tree import KTree as KT
  import pytest
  
  
  @pytest.fixture
  def single_tree():
      tree = KT()
      tree.insert(1, None)
      return tree
  
  
  @pytest.fixture
  def small_tree():
      tree = KT()
      tree.insert(1, None)
      tree.insert(2, 1)
      tree.insert(3, 1)
      return tree
  
  
  @pytest.fixture
  def tree():
      tree = KT()
      tree.insert(1, None)
      tree.insert(2, 1)
      tree.insert(3, 1)
      tree.insert(4, 1)
      tree.insert(5, 1)
      return tree
  