content: import sys
  from multiprocessing import Lock
  
  import pytest
  from flaky import flaky
  
  from tests.background_callback.utils import setup_background_callback_app
  
  
  @pytest.mark.skipif(
      sys.version_info < (3, 7), reason="Python 3.6 long callbacks tests hangs up"
  )
  @flaky(max_runs=3)
  def test_lcbc003_long_callback_running_cancel(dash_duo, manager):
      lock = Lock()
  
      with setup_background_callback_app(manager, "app3") as app:
          dash_duo.start_server(app)
          dash_duo.wait_for_text_to_equal("#result", "No results", 15)
          dash_duo.wait_for_text_to_equal("#status", "Finished", 6)
  
          dash_duo.find_element("#run-button").click()
          dash_duo.wait_for_text_to_equal("#result", "Processed 'initial value'", 15)
          dash_duo.wait_for_text_to_equal("#status", "Finished", 6)
  
          # Update input text box
          input_ = dash_duo.find_element("#input")
          dash_duo.clear_input(input_)
  
          for key in "hello world":
              with lock:
                  input_.send_keys(key)
  
          # Click run button and check that status has changed to "Running"
          dash_duo.find_element("#run-button").click()
          dash_duo.wait_for_text_to_equal("#status", "Running", 8)
  
          # Then click Cancel button and make sure that the status changes to finish
          # without update result
          dash_duo.find_element("#cancel-button").click()
          dash_duo.wait_for_text_to_equal("#result", "Processed 'initial value'", 12)
          dash_duo.wait_for_text_to_equal("#status", "Finished", 8)
  
          # Click run button again, and let it finish
          dash_duo.find_element("#run-button").click()
          dash_duo.wait_for_text_to_equal("#status", "Running", 8)
          dash_duo.wait_for_text_to_equal("#result", "Processed 'hello world'", 8)
          dash_duo.wait_for_text_to_equal("#status", "Finished", 8)
  
      assert not dash_duo.redux_state_is_loading
      assert dash_duo.get_logs() == []
  