old_contents: import pytest
  import os
  
  
  def pytest_configure():
      pytest.ding0_test_network_path = os.path.join(
          os.path.realpath(os.path.dirname(__file__)),
          "ding0_test_network_1")
  
      pytest.ding0_test_network_2_path = os.path.join(
          os.path.realpath(os.path.dirname(__file__)),
          "ding0_test_network_2")
  
new_contents: import pytest
  import os
  
  
  def pytest_configure(config):
      pytest.ding0_test_network_path = os.path.join(
          os.path.realpath(os.path.dirname(__file__)),
          "ding0_test_network_1")
  
      pytest.ding0_test_network_2_path = os.path.join(
          os.path.realpath(os.path.dirname(__file__)),
          "ding0_test_network_2")
  
      config.addinivalue_line("markers", "slow: mark test as slow to run")
  
  
  def pytest_addoption(parser):
      parser.addoption(
          "--runslow", action="store_true", default=False, help="run slow tests"
      )
  
  
  def pytest_collection_modifyitems(config, items):
      if config.getoption("--runslow"):
          # --runslow given in cli: do not skip slow tests
          return
      skip_slow = pytest.mark.skip(reason="need --runslow option to run")
      for item in items:
          if "slow" in item.keywords:
              item.add_marker(skip_slow)
  
subject: Add option to skip slow tests to conftest