code: def test_loc_non_informative_index(self):
      pdf = pd.DataFrame({"x": [1, 2, 3, 4]}, index=[10, 20, 30, 40])
      psdf = ps.from_pandas(pdf)
  
      self.assert_eq(psdf.loc[20:30], pdf.loc[20:30])
  
      pdf = pd.DataFrame({"x": [1, 2, 3, 4]}, index=[10, 20, 20, 40])
      psdf = ps.from_pandas(pdf)
      self.assert_eq(psdf.loc[20:20], pdf.loc[20:20])
  
imports: import unittest
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 7 for calling the IndexingLocMixin obj's underlying member method code with example usage: obj.test_loc_non_informative_index() without return types