text: # Copyright 2020 Adap GmbH. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # ==============================================================================
  """Tests for module server."""
  
  import socket
  from contextlib import closing
  from typing import cast
  
  from flwr.client_manager import SimpleClientManager
  from flwr.grpc_server.grpc_server import start_insecure_grpc_server
  
  
  def unused_tcp_port() -> int:
      """Return an unused port."""
      with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
          sock.bind(("", 0))
          sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
          return cast(int, sock.getsockname()[1])
  
  
  def test_integration_start_and_shutdown_server():
      """Create server and check if FlowerServiceServicer is returned."""
      # Prepare
      port = unused_tcp_port()
      client_manager = SimpleClientManager()
  
      # Execute
      server = start_insecure_grpc_server(
          client_manager=client_manager, server_address=f"[::]:{port}"
      )
  
      # Teardown
      server.stop(1)
  