code: def test_get_sentences(self):
      self.assertEqual(["今天天气很好。"], sample.get_sentences("x"))
      new_sample = UTCnSample({"x": ""})
      self.assertEqual([], new_sample.get_sentences("x"))
  
imports: import unittest
  from textflint.input.component.sample.utcn_sample import *
label_desc: Use image node_id 5 for calling the TestUTCnSample obj's underlying member method code with example usage: obj.test_get_sentences() without return types