code: def test_comment_lines(self):
      self.create_file(
          "sample.py", "# Comment\nprint('Hello')\n# Another comment\n"
      )
      loc = count_loc(self.test_dir)
      self.assertEqual(loc, 1)
  
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 7 for calling the TestCountLoc obj's underlying member method code with example usage: obj.test_comment_lines() without return types