class_docstr: Test remove digits.
class_docstr_tok: ["Test","remove","digits","."]
code: def test_remove_brackets(self):
      s = pd.Series(
          "Remove all [square_brackets]{/curly_brackets}(round_brackets)<angle_brackets>"
      )
      s_true = pd.Series("Remove all ")
      self.assertEqual(preprocessing.remove_brackets(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 30 for calling the TestPreprocessing obj's underlying member method code with example usage: obj.test_remove_brackets() without return types