def test_path_retro_basic(self):
        
        vertices, edges = self.spt.path_retro( "B" )

        self.assertEqual( vertices[0].label , self.B.label )
        self.assertEqual( vertices[1].label , self.A.label )
        self.assertEqual( edges[0].payload.name , self.a.payload.name )
ShortestPathTree.path_retro works on a trivial graph
dataset/ETHPy150Open bmander/graphserver/pygs/test/unit_test/test_spt.py/TestShortestPathTree.test_path_retro_basic