docstr: Unit test telco_customer
docstr_tok: ["Unit","test","telco_customer"]
code: def test_load_telco(self):
      """
      Unit test telco_customer
      """
      telco_df = data_loading("telco_customer_churn")
      assert isinstance(telco_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 3 for calling the Test_load_data obj's underlying member method code with example usage: obj.test_load_telco() without return types