code: def create_one_valued_time_series(self):
      cid = [1, 2, 2]
      ckind = ["a", "a", "a"]
      csort = [1, 1, 2]
      cval = [1.0, 5.0, 6.0]
      df = pd.DataFrame(
          {"id": cid, "kind": ckind, "sort": csort, "val": cval}
      )
      return df
  
file_path: tsfresh/tests/fixtures.py
imports: import warnings
  from contextlib import contextmanager
  from unittest import TestCase
  import numpy
  import pandas
label_desc: Use image node_id 5 for calling the DataTestCase obj's underlying member method code with example usage: obj.create_one_valued_time_series() and returns: df