code: def _create_sample_only_published_dashboard_with_roles(self):
      username = random_str()
      new_role = f"role_{random_str()}"
      self.create_user_with_roles(
          username, [new_role], should_create_roles=True
      )
      published_dashboards = [
          create_dashboard_to_db(published=True),
          create_dashboard_to_db(published=True),
      ]
      draft_dashboards = [
          create_dashboard_to_db(published=False),
          create_dashboard_to_db(published=False),
      ]
      for dash in published_dashboards + draft_dashboards:
          grant_access_to_dashboard(dash, new_role)
      self.login(username)
      return new_role, draft_dashboards, published_dashboards
  
imports: import json
  from unittest import mock
  from unittest.mock import patch
  import pytest
  from superset.commands.dashboard.exceptions import DashboardForbiddenError
  from superset.daos.dashboard import DashboardDAO
  from superset.utils.core import backend, override_user
  from tests.integration_tests.conftest import with_feature_flags
  from tests.integration_tests.dashboards.dashboard_test_utils import *
  from tests.integration_tests.dashboards.security.base_case import BaseTestDashboardSecurity
  from tests.integration_tests.dashboards.superset_factory_util import create_dashboard_to_db, create_database_to_db, create_datasource_table_to_db, create_slice_to_db
  from tests.integration_tests.fixtures.birth_names_dashboard import load_birth_names_dashboard_with_slices, load_birth_names_data
  from tests.integration_tests.fixtures.public_role import public_role_like_gamma
  from tests.integration_tests.fixtures.query_context import get_query_context
  from tests.integration_tests.fixtures.world_bank_dashboard import load_world_bank_dashboard_with_slices, load_world_bank_data
label_desc: Use image node_id 12 for calling the TestDashboardRoleBasedSecurity obj's underlying member method code with example usage: obj._create_sample_only_published_dashboard_with_roles() and returns: new_role,  draft_dashboards,  published_dashboards