code: def create_css_templates(self):
      with self.create_app().app_context():
          css_templates = []
          for cx in range(CSS_TEMPLATES_FIXTURE_COUNT):
              css_templates.append(
                  self.insert_css_template(
                      template_name=f"template_name{cx}", css=f"css{cx}"
                  )
              )
          yield css_templates
  
          # rollback changes
          for css_template in css_templates:
              db.session.delete(css_template)
          db.session.commit()
  
imports: import json
  import pytest
  import prison
  from datetime import datetime
  from freezegun import freeze_time
  from sqlalchemy.sql import func
  import tests.integration_tests.test_app
  from superset import db
  from superset.models.core import CssTemplate
  from superset.utils.database import get_example_database
  from tests.integration_tests.base_tests import SupersetTestCase
label_desc: Use image node_id 2 for calling the TestCssTemplateApi obj's underlying member method code with example usage: obj.create_css_templates() without return types