old_contents: """
  Tests for dit.pid.lattice.
  """
  
  from dit.pid.lattice import least_upper_bound, pid_lattice
  
  
  def test_lub():
      """
      Test least upper bound
      """
      lattice = pid_lattice(((0,), (1,)))
      lub = least_upper_bound(lattice, [((0,), (1,)), ((0,),)])
      assert lub == ((0, 1),)
  
  
new_contents: """
  Tests for dit.pid.lattice.
  """
  
  from dit.pid.lattice import least_upper_bound, pid_lattice
  
  
  def test_lub():
      """
      Test least upper bound
      """
      lattice = pid_lattice(((0,), (1,)))
      lub = least_upper_bound(lattice, [((0,), (1,)), ((0,),)])
      assert lub == ((0,),)
  
  
subject: fix lattice test