code: def test_simple_1(self):
      text = ""
      actual = sent_tokenize(text)
      expected = []
      self.assertEqual(actual, expected)
  
imports: from unittest import TestCase
  from underthesea import sent_tokenize
label_desc: Use image node_id 1 for calling the TestSentTokenize obj's underlying member method code with example usage: obj.test_simple_1() without return types