content: import sys
  
  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_lcbc007_validation_layout(dash_duo, manager):
      with setup_background_callback_app(manager, "app7") as app:
          dash_duo.start_server(app)
  
          # Show layout
          dash_duo.find_element("#show-layout-button").click()
  
          dash_duo.wait_for_text_to_equal("#status", "Finished", 8)
          dash_duo.wait_for_text_to_equal("#result", "No results", 8)
  
          # click run and check that status eventually cycles to 2/4
          dash_duo.find_element("#run-button").click()
          dash_duo.wait_for_text_to_equal("#status", "Progress 2/4", 15)
  
          # Then click Cancel button and make sure that the status changes to finish
          # without updating result
          dash_duo.find_element("#cancel-button").click()
          dash_duo.wait_for_text_to_equal("#status", "Finished", 8)
          dash_duo.wait_for_text_to_equal("#result", "No results", 8)
  
          # Click run button and allow callback to finish
          dash_duo.find_element("#run-button").click()
          dash_duo.wait_for_text_to_equal("#status", "Progress 2/4", 15)
          dash_duo.wait_for_text_to_equal("#status", "Finished", 15)
          dash_duo.wait_for_text_to_equal("#result", "Processed 'hello, world'", 8)
  
          # Click run button again with same input.
          # without caching, this should rerun callback and display progress
          dash_duo.find_element("#run-button").click()
          dash_duo.wait_for_text_to_equal("#status", "Progress 2/4", 15)
          dash_duo.wait_for_text_to_equal("#status", "Finished", 15)
          dash_duo.wait_for_text_to_equal("#result", "Processed 'hello, world'", 8)
  
      assert not dash_duo.redux_state_is_loading
      assert dash_duo.get_logs() == []
  