text: import os
  import sys
  import time
  
  import pytest
  
  sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
  SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
  
  from helpers.cluster import ClickHouseCluster
  
  cluster = ClickHouseCluster(__file__)
  node = cluster.add_instance('node', stay_alive=True, main_configs=['config/models_config.xml', 'config/catboost_lib.xml'])
  
  
  def copy_file_to_container(local_path, dist_path, container_id):
      os.system("docker cp {local} {cont_id}:{dist}".format(local=local_path, cont_id=container_id, dist=dist_path))
  
  
  config = '''<clickhouse>
      <models_config>/etc/clickhouse-server/model/{model_config}</models_config>
  </clickhouse>'''
  
  
  @pytest.fixture(scope="module")
  def started_cluster():
      try:
          cluster.start()
  
          copy_file_to_container(os.path.join(SCRIPT_DIR, 'model/.'), '/etc/clickhouse-server/model', node.docker_id)
          node.restart_clickhouse()
  
          yield cluster
  
      finally:
          cluster.shutdown()
  
  
  def change_config(model_config):
      node.replace_config("/etc/clickhouse-server/config.d/models_config.xml", config.format(model_config=model_config))
      node.query("SYSTEM RELOAD CONFIG;")
  
  
  def test(started_cluster):
      if node.is_built_with_memory_sanitizer():
          pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")
  
      # Set config with the path to the first model.
      change_config("model_config.xml")
  
      node.query("SELECT modelEvaluate('model1', 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);")
  
      # Change path to the second model in config.
      change_config("model_config2.xml")
  
      # Check that the new model is loaded.
      node.query("SELECT modelEvaluate('model2', 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);")
  
      # Check that the old model was unloaded.
      node.query_and_get_error("SELECT modelEvaluate('model1', 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);")
  
  