code: def test_classify_simple_case_3(self):
      text = "Lãi suất từ BIDV rất ưu đãi"
      actual = classify(text, domain="bank")
      expected = ["DISCOUNT"]
      self.assertEqual(expected, actual)
  
imports: from unittest import TestCase
  from underthesea import classify
label_desc: Use image node_id 3 for calling the TestBankClassify obj's underlying member method code with example usage: obj.test_classify_simple_case_3() without return types