code: def test_template(self):
      df = self.create_sample_dataframe()
  
      output = (
          df.select(SF.template("{x}_{yz}"))
          .toPandas()
          .iloc[:, 0]
          .values
      )
  
      # a and b have the same elements in the same number, regardless of their order
      self.assertCountEqual(["1_Bob", "2_Mandy"], output)
  
imports: import unittest
  from pyspark.sql import types, functions
  import synapse.ml.core.spark.functions
  from synapsemltest.spark import *
label_desc: Use image node_id 2 for calling the TemplateSpec obj's underlying member method code with example usage: obj.test_template() without return types