code: def test_get_backward_dataframes(es):
      dataframes = es.get_backward_dataframes("customers")
      path_to_sessions = backward_path(es, ["customers", "sessions"])
      assert list(dataframes) == [("sessions", path_to_sessions)]
  
imports: import pandas
  import pytest
  from featuretools import EntitySet
  from featuretools.tests.testing_utils import backward_path, forward_path
label_desc: Use image node_id 4 for calling a global function with example usage: test_get_backward_dataframes(es) without return types