docstr: Unit test us_car_accident
docstr_tok: ["Unit","test","us_car_accident"]
code: def test_load_accidents(self):
      """
      Unit test us_car_accident
      """
      accidents_df = data_loading("us_car_accident")
      assert isinstance(accidents_df, pd.DataFrame)
  
file_path: shapash/tests/unit_tests/data/test_data_loader.py
imports: import unittest
  from shapash.data.data_loader import data_loading
  import pandas
label_desc: Use image node_id 4 for calling the Test_load_data obj's underlying member method code with example usage: obj.test_load_accidents() without return types