code: def test_unicode_b2a(self):
      # Unicode strings are not accepted by b2a_* functions.
      for func in set(all_functions) - set(a2b_functions):
          try:
              self.assertRaises(
                  TypeError, getattr(binascii, func), "test"
              )
          except Exception as err:
              self.fail('{}("test") raises {!r}'.format(func, err))
      # crc_hqx needs 2 arguments
      self.assertRaises(TypeError, binascii.crc_hqx, "test", 0)
  
imports: import unittest
  import binascii
  import array
  import re
  from test.support import bigmemtest, _1G, _4G
  from test.support.hypothesis_helper import hypothesis
label_desc: Use image node_id 20 for calling the BinASCIITest obj's underlying member method code with example usage: obj.test_unicode_b2a() without return types