docstr: Tests process with unrecognizable tokens.
docstr_tok: ["Tests","process","with","unrecognizable","tokens","."]
code: def test_unknown_token(self):
      """
      Tests process with unrecognizable tokens.
      """
      atf = ATFConverter(two_three=True)
      signs = ["a2", "☉", "be3"]
      target = ["a₂", "☉", "be₃"]
      output = atf.process(signs)
      self.assertEqual(output, target)
  
file_path: cltk/tests/test_text.py
imports: import unittest
  from unittest.mock import patch
  from cltk.text.akk import ATFConverter
label_desc: Use image node_id 3 for calling the TestAkkadianUtils obj's underlying member method code with example usage: obj.test_unknown_token() without return types