class_docstr: Test remove digits.
class_docstr_tok: ["Test","remove","digits","."]
code: def test_pipeline_default(self):
      s = pd.Series(
          [
              "Amazon! < br />< br /> If I was going to order any soft drink online, it would be Diet Coke with Lime",
              pd.NA,
              "-1234. Mère, Françoise, noël",
          ]
      )
      s_true = pd.Series(
          [
              "amazon going order soft drink online would diet coke lime",
              "",
              "mere francoise noel",
          ]
      )
      self.assertEqual(preprocessing.clean(s), s_true)
  
imports: import string
  import pytest
  import pandas
  import numpy
  import doctest
  from texthero import preprocessing, stopwords
  from .None import PandasTestCase
  import warnings
label_desc: Use image node_id 14 for calling the TestPreprocessing obj's underlying member method code with example usage: obj.test_pipeline_default() without return types