code: def getIdleTimeMillisSinceLastNotebookExecution(self):
      return (time.time() - self.created_time) * 1000
  
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 2 for calling the MockDbApiEntry obj's underlying member method code with example usage: obj.getIdleTimeMillisSinceLastNotebookExecution() and returns: unknown