code: def test_properties(self):
      with open("examples/test.csv", encoding="utf-8") as f:
          reader = csv_py3.Reader(f)
  
          self.assertEqual(reader.dialect.delimiter, ",")
          self.assertEqual(reader.line_num, 0)
  
          next(reader)
  
          self.assertEqual(reader.line_num, 1)
  
imports: import csv
  import os
  import platform
  import sys
  import unittest
  from io import StringIO
  from agate import csv_py3
  from agate.exceptions import FieldSizeLimitError
label_desc: Use image node_id 4 for calling the TestReader obj's underlying member method code with example usage: obj.test_properties() without return types