code: def _test_with_key(left, right, isLeft):
      def right_assign_key(key, lft, rgt):
          return (
              lft.assign(key=key[0])
              if isLeft
              else rgt.assign(key=key[0])
          )
  
      result = (
          left.groupby("id")
          .cogroup(right.groupby("id"))
          .applyInPandas(
              right_assign_key, "id long, k int, v int, key long"
          )
          .toPandas()
      )
  
      expected = left.toPandas() if isLeft else right.toPandas()
      expected = expected.assign(key=expected.id)
  
      assert_frame_equal(expected, result)
  
imports: import unittest
  from typing import cast
  from pyspark.sql.functions import array, explode, col, lit, udf, pandas_udf, sum
  from pyspark.sql.types import ArrayType, DoubleType, LongType, StructType, StructField, YearMonthIntervalType, Row
  from pyspark.sql.window import Window
  from pyspark.errors import IllegalArgumentException, PythonException
  from pyspark.testing.sqlutils import ReusedSQLTestCase, have_pandas, have_pyarrow, pandas_requirement_message, pyarrow_requirement_message
  from pyspark.testing.utils import QuietTest
label_desc: Use image node_id 38 for calling the CogroupedApplyInPandasTestsMixin obj's underlying member method code with example usage: obj._test_with_key(left, right, isLeft) and returns: unknown