code: def test_get_spark(self):
      df = self.create_sample_dataframe()
      assert df is not None
  
      spark = DataFrameUtils.get_spark_session(df)
  
      assert spark is not None
      assert spark is sc.sparkSession
  
file_path: SynapseML/core/src/test/python/synapsemltest/cyber/utils/test_spark_utils.py
imports: import unittest
  from typing import List, Tuple
  from pyspark.sql import DataFrame
  from pyspark.sql.types import StructType, StructField, StringType
  from pyspark.ml import Transformer
  from pyspark.ml.param.shared import Param, Params
  from synapse.ml.cyber.utils.spark_utils import DataFrameUtils, ExplainBuilder, HasSetInputCol, HasSetOutputCol
  from synapsemltest.spark import *
label_desc: Use image node_id 3 for calling the TestDataFrameUtils obj's underlying member method code with example usage: obj.test_get_spark() without return types