docstr: Test the @link medpy.graphcut.graph.Graph implementation.
docstr_tok: ["Test","the","@","link","medpy.graphcut.graph.Graph","implementation","."]
code: def test_Graph(self):
      """Test the @link medpy.graphcut.graph.Graph implementation."""
      pass
  
imports: import unittest
  from medpy.graphcut import GCGraph
label_desc: Use image node_id 1 for calling the TestGraph obj's underlying member method code with example usage: obj.test_Graph() without return types