code: def well_dataframe():
      data = {
          "Well": ["A21", "A3", "A21", "B2", "B51", "B12"],
          "Value": [1, 2, 13, 3, 4, 7],
      }
      df = pd.DataFrame(data)
      return df
  
imports: import pandas
  import pytest
  from natsort import natsorted
  from pandas.testing import assert_frame_equal
  import janitor
label_desc: Use image node_id 1 for calling a global function with example usage: well_dataframe() and returns: df