text: import os
  from cw_geodata.data import data_dir
  from cw_geodata.vector_label.graph import geojson_to_graph
  import pickle
  import networkx as nx
  
  
  class TestGeojsonToGraph(object):
      """Tests for cw_geodata.vector_label.graph.geojson_to_graph."""
  
      def test_graph_creation(self):
          """Test if a newly created graph is identical to an existing one."""
          with open(os.path.join(data_dir, 'sample_graph.pkl'), 'rb') as f:
              truth_graph = pickle.load(f)
              f.close()
          output_graph = geojson_to_graph(os.path.join(data_dir,
                                                       'sample_roads.geojson'))
  
          assert nx.is_isomorphic(truth_graph, output_graph)
  