code: def test_items(self):
      # GH#17213, GH#13918
      cols = ["a", "b", "c"]
      df = DataFrame([[1, 2, 3], [4, 5, 6]], columns=cols)
      for c, (k, v) in zip(cols, df.items()):
          assert c == k
          assert isinstance(v, Series)
          assert (df[k] == v).all()
  
imports: import datetime
  import numpy
  import pytest
  from pandas.compat import IS64, is_platform_windows
  from pandas import Categorical, DataFrame, Series, date_range
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestIteration obj's underlying member method code with example usage: obj.test_items() without return types