code: def test_read_movielens_df(
      movielens_explicit_df, movielens_explicit_df_not_decremented
  ):
      assert movielens_explicit_df.shape == (100000, 4)
      assert movielens_explicit_df_not_decremented.shape == (100000, 4)
  
      assert (
          movielens_explicit_df["user_id"].min()
          == movielens_explicit_df["item_id"].min()
          == 0
      )
      assert (
          movielens_explicit_df_not_decremented["user_id"].min()
          == movielens_explicit_df_not_decremented["item_id"].min()
          == 1
      )
  
file_path: collie/tests/test_movielens.py
imports: from unittest import mock
  import urllib
  import pandas
  import pytest
  from collie.movielens import get_recommendation_visualizations, read_movielens_posters_df, run_movielens_example
label_desc: Use image node_id 1 for calling a global function with example usage: test_read_movielens_df(movielens_explicit_df, movielens_explicit_df_not_decremented) without return types