code: def registerBackgroundSparkJobGroup(self, job_group_id):
      self.registered_job_groups.append(job_group_id)
  
file_path: ray/python/ray/tests/spark/test_databricks_hook.py
imports: import sys
  import pytest
  import os
  import time
  import ray
  from pyspark.sql import SparkSession
  from ray.util.spark import setup_ray_cluster
  import ray.util.spark.databricks_hook
label_desc: Use image node_id 3 for calling the MockDbApiEntry obj's underlying member method code with example usage: obj.registerBackgroundSparkJobGroup(job_group_id) without return types