def testset2_alternative(self):
'''Graph2 find alternative paths'''
search = Pathfinding(True, 'data/graph2.txt')
path = search.shortestPath('A', 'E')
alt = search.alternateRoute(3, path)
self.assertTrue(alt[0] == min(alt))
for route in alt:
self.assertTrue(route[1] != path) # alternative != optimal path
