code: def test_repartition(self):
      file_path = os.path.join(self.resource_path, "orca/data/json")
      data_shard = zoo.orca.data.pandas.read_json(
          file_path, orient="columns", lines=True
      )
      partitions_num_1 = data_shard.rdd.getNumPartitions()
      assert partitions_num_1 == 2, "number of partition should be 2"
      data_shard.cache()
      partitioned_shard = data_shard.repartition(1)
      assert data_shard.is_cached(), "data_shard should be cached"
      assert (
          partitioned_shard.is_cached()
      ), "partitioned_shard should be cached"
      data_shard.uncache()
      assert not data_shard.is_cached(), "data_shard should be uncached"
      partitions_num_2 = partitioned_shard.rdd.getNumPartitions()
      assert partitions_num_2 == 1, "number of partition should be 1"
  
imports: import os.path
  import shutil
  import pytest
  from unittest import TestCase
  import zoo.orca.data
  import zoo.orca.data.pandas
  from zoo.orca import OrcaContext
  from zoo.orca.data import SharedValue
  from zoo.common.nncontext import *
  from zoo.orca.data import SparkXShards
label_desc: Use image node_id 6 for calling the TestSparkXShards obj's underlying member method code with example usage: obj.test_repartition() without return types