code: def test_4(self):
      cw = dirname(__file__)
      with open(join(cw, "tests.txt")) as f:
          lines = f.readlines()
      items = [line.strip() for line in lines]
      for item in items:
          syllable, ipa = item.split(",")
          actual = viet2ipa(syllable)
          self.assertEqual(ipa, actual)
  
file_path: underthesea/tests/pipeline/ipa/test_ipa.py
imports: from os.path import dirname, join
  from unittest import TestCase
  from underthesea.pipeline.ipa import viet2ipa
label_desc: Use image node_id 4 for calling the TestIPA obj's underlying member method code with example usage: obj.test_4() without return types