def test_chow_unreachable(self):
     heuristic = chow( "Wales", "North Korea", "Russia" )
     self.G.add_node("Sealand")
     self.G.add_edge("England", "Sealand")
     heuristic.optimize(self.G)
     self.G.del_edge("England", "Sealand")
     
     try:
         result = pygraph.algorithms.minmax.heuristic_search( self.G, "England", "Sealand" , heuristic )
     except exceptions.NodeUnreachable, _:
         return
 def test_chow(self):
     heuristic = chow( "Wales", "North Korea", "Russia" )
     heuristic.optimize(self.G)
     result = pygraph.algorithms.minmax.heuristic_search( self.G, "England", "India", heuristic )