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# Owner(s): ["oncall: r2p"]
# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
import pathlib
import sys
import unittest
import torch.distributed.elastic.rendezvous as rdvz
BACKEND_NAME = "testbackend"
TEST_PACKAGE_PATH = "/out_of_tree_test_package/src"
class OutOfTreeRendezvousTest(unittest.TestCase):
def test_out_of_tree_handler_loading(self):
current_path = str(pathlib.Path(__file__).parent.resolve())
rdvz._register_out_of_tree_handlers()
registry_dict = rdvz.rendezvous_handler_registry._registry
# test backend should not be registered as a backend
self.assertFalse(BACKEND_NAME in registry_dict)
# Including testbackend in python path
sys.path.append(current_path + TEST_PACKAGE_PATH)
# Registering the out of tree handlers again
rdvz._register_out_of_tree_handlers()
# test backend should be registered as a backend
self.assertTrue(BACKEND_NAME in registry_dict)
# Removing testbackend from python path
sys.path.remove(current_path + TEST_PACKAGE_PATH)
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