code: def create_fake_db(self):
      self.login(username="admin")
      database_name = FAKE_DB_NAME
      db_id = 100
      extra = """{
              "schemas_allowed_for_file_upload":
              ["this_schema_is_allowed", "this_schema_is_allowed_too"]
          }"""
  
      return self.get_or_create(
          cls=models.Database,
          criteria={"database_name": database_name},
          session=db.session,
          sqlalchemy_uri="sqlite:///:memory:",
          id=db_id,
          extra=extra,
      )
  
imports: from datetime import datetime
  import imp
  import json
  from contextlib import contextmanager
  from typing import Any, Union, Optional
  from unittest.mock import Mock, patch, MagicMock
  import pandas
  from flask import Response
  from flask_appbuilder.security.sqla import models
  from flask_testing import TestCase
  from sqlalchemy.engine.interfaces import Dialect
  from sqlalchemy.ext.declarative import DeclarativeMeta
  from sqlalchemy.orm import Session
  from sqlalchemy.sql import func
  from sqlalchemy.dialects.mysql import dialect
  from tests.integration_tests.test_app import app, login
  from superset.sql_parse import CtasMethod
  from superset import db, security_manager
  from superset.connectors.sqla.models import BaseDatasource, SqlaTable
  from superset.models import core
  from superset.models.slice import Slice
  from superset.models.core import Database
  from superset.models.dashboard import Dashboard
  from superset.utils.core import get_example_default_schema
  from superset.utils.database import get_example_database
  from superset.views.base_api import BaseSupersetModelRestApi
label_desc: Use image node_id 25 for calling the SupersetTestCase obj's underlying member method code with example usage: obj.create_fake_db() and returns: self