code: def test_tokenize_3(self):
      text = """Giá khuyến mãi: 140.000đ / kg  ==> giảm được 20%"""
      actual = tokenize(text, format="text")
      expected = "Giá khuyến mãi : 140.000 đ / kg ==> giảm được 20 %"
      self.assertEqual(expected, actual)
  
imports: from unittest import TestCase
  from underthesea.pipeline.word_tokenize.regex_tokenize import tokenize
label_desc: Use image node_id 3 for calling the TestTokenize obj's underlying member method code with example usage: obj.test_tokenize_3() without return types