code: def test_load_peyton_manning():
      dl = DataLoader()
      df = dl.load_peyton_manning()
      assert list(df.columns) == [TIME_COL, "y"]
      assert df.shape == (2905, 2)
  
imports: import os
  import re
  import pandas
  import pytest
  from greykite.common.constants import TIME_COL
  from greykite.common.data_loader import DataLoader
  from greykite.common.testing_utils import assert_equal
label_desc: Use image node_id 7 for calling a global function with example usage: test_load_peyton_manning() without return types