old_contents: from ...framework.solve import solve_problem
  
  
  def test_dijkstra() -> None:
      solve_problem(81)
  # need to make it more independent, and also add more dijkstra functionality.
  
new_contents: from .dijkstra import source_target_dijkstra_cost
  from ...solutions.problem_81 import matrix_steps_to_vertices_edges
  
  
  def test_dijkstra() -> None:
      matrix = [[131, 673, 234, 103, 18],
                [201, 96, 342, 965, 150],
                [630, 803, 746, 422, 111],
                [537, 699, 497, 121, 956],
                [805, 732, 524, 37, 331]]
  
      rows = len(matrix)
      columns = len(matrix[0])
  
      sources = [(0, 0)]
      drains = [(-1 % rows, -1 % columns)]
      steps = [(-1, 0), (0, -1), (0, 1), (1, 0)]
  
      v, e = matrix_steps_to_vertices_edges(matrix, steps, sources, drains)
  
      source_target_dijkstra_cost(v, e, (-1, 0), (0, -1))
  
subject: Improve test dijkstra