code: def test_has_unique_path(diamond_es):
      assert diamond_es.has_unique_forward_path("customers", "regions")
      assert not diamond_es.has_unique_forward_path(
          "transactions", "regions"
      )
  
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 20 for calling a global function with example usage: test_has_unique_path(diamond_es) without return types