code: def start_server(self, app, cwd=None):
      # start server with Dash.jl app. The app sets its own run_server args
      # on the Julia side, but we support overriding the automatic cwd
      self.server(app, cwd=cwd)
  
      # set the default server_url, it implicitly call wait_for_page
      self.server_url = self.server.url
  
file_path: dash/dash/testing/composite.py
imports: from dash.testing.browser import Browser
label_desc: Use image node_id 2 for calling the DashJuliaComposite obj's underlying member method code with example usage: obj.start_server(app, cwd) without return types