code: def test_build_graph_from_str(self):
      build_graph_from_str(self.daggity_file)
      build_graph_from_str(self.graph_str)
  
imports: import networkx
  import pandas
  import pytest
  from flaky import flaky
  from pytest import mark
  import dowhy
  import dowhy.datasets
  from dowhy import CausalModel
  from dowhy.graph import *
  from dowhy.utils.graph_operations import daggity_to_dot
label_desc: Use image node_id 11 for calling the TestCausalGraph obj's underlying member method code with example usage: obj.test_build_graph_from_str() without return types