code: def test_quantiles_graph_repr(self):
      quantiles = TestingDataSet.float_col.latest.quantiles(5)
      self.assertEqual(quantiles.graph_repr(), "Quantiles(5)")
  
imports: from functools import reduce
  import operator
  import numpy
  import pandas
  from zipline.lib.labelarray import LabelArray
  from zipline.pipeline import Classifier
  from zipline.pipeline.data.testing import TestingDataSet
  from zipline.pipeline.expression import methods_to_ops
  from zipline.testing import parameter_space
  from zipline.testing.fixtures import ZiplineTestCase
  from zipline.testing.predicates import assert_equal
  from zipline.utils.numpy_utils import categorical_dtype, int64_dtype
  from .base import BaseUSEquityPipelineTestCase
label_desc: Use image node_id 1 for calling the ReprTestCase obj's underlying member method code with example usage: obj.test_quantiles_graph_repr() without return types