code: def test_init():
      dl = DataLoader()
      assert dl.available_datasets == dl.get_data_inventory()
  
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 1 for calling a global function with example usage: test_init() without return types