content: import pytest
  from dash_core_components_page import DashCoreComponentsMixin
  from dash.testing.browser import Browser
  
  
  class DashCoreComponentsComposite(Browser, DashCoreComponentsMixin):
      def __init__(self, server, **kwargs):
          super(DashCoreComponentsComposite, self).__init__(**kwargs)
          self.server = server
  
      def start_server(self, app, **kwargs):
          """start the local server with app"""
  
          # start server with app and pass Dash arguments
          self.server(app, **kwargs)
  
          # set the default server_url, it implicitly call wait_for_page
          self.server_url = self.server.url
  
  
  @pytest.fixture
  def dash_dcc(request, dash_thread_server, tmpdir):
      with DashCoreComponentsComposite(
          dash_thread_server,
          browser=request.config.getoption("webdriver"),
          remote=request.config.getoption("remote"),
          remote_url=request.config.getoption("remote_url"),
          headless=request.config.getoption("headless"),
          options=request.config.hook.pytest_setup_options(),
          download_path=tmpdir.mkdir("download").strpath,
          percy_assets_root=request.config.getoption("percy_assets"),
          percy_finalize=request.config.getoption("nopercyfinalize"),
          pause=request.config.getoption("pause"),
      ) as dc:
          yield dc
  
  
  @pytest.fixture
  def dash_dcc_headed(request, dash_thread_server, tmpdir):
      with DashCoreComponentsComposite(
          dash_thread_server,
          browser=request.config.getoption("webdriver"),
          remote=request.config.getoption("remote"),
          remote_url=request.config.getoption("remote_url"),
          headless=False,
          options=request.config.hook.pytest_setup_options(),
          download_path=tmpdir.mkdir("download").strpath,
          percy_assets_root=request.config.getoption("percy_assets"),
          percy_finalize=request.config.getoption("nopercyfinalize"),
          pause=request.config.getoption("pause"),
      ) as dc:
          yield dc
  