code: def test_index(self):
      # to check setting name of Index properly.
      idx = pd.Index([1, 2, 3, 4, 5, 6, 7, 8, 9])
      pser = pd.Series(
          [45, 200, 1.2, 30, 250, 1.5, 320, 1, 0.3], index=idx
      )
      psser = ps.from_pandas(pser)
  
      psser.name = "koalas"
      pser.name = "koalas"
      self.assert_eq(psser.index.name, pser.index.name)
  
      # for check setting names of MultiIndex properly.
      psser.names = ["hello", "koalas"]
      pser.names = ["hello", "koalas"]
      self.assert_eq(psser.index.names, pser.index.names)
  
imports: import unittest
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 9 for calling the SeriesIndexMixin obj's underlying member method code with example usage: obj.test_index() without return types