code: def test_empty_file(self):
      self.create_file("empty.py", "")
      loc = count_loc(self.test_dir)
      self.assertEqual(loc, 0)
  
imports: import os
  import sys
  from io import StringIO
  from keras.testing import test_case
  from keras.utils.code_stats import count_loc
label_desc: Use image node_id 8 for calling the TestCountLoc obj's underlying member method code with example usage: obj.test_empty_file() without return types