new_contents: import pytest
  
  
  def pytest_addoption(parser):
      parser.addoption("--runslow", action="store_true",
          help="run slow tests")
  
  def pytest_runtest_setup(item):
      if 'slow' in item.keywords and not item.config.getoption("--runslow"):
          pytest.skip("need --runslow option to run")
  
subject: Add pytest config file for slow tests.