old_contents: import os
  import random
  import string
  
  
  class CoreTest:
      RUCAPTCHA_KEY = os.getenv("RUCAPTCHA_KEY", "ad9053f3182ca81755768608fa758570")
  
      def get_random_string(self, length: int) -> str:
          """
          Method generate random string with set length
          : param length: Len of generated string
          : return: Random letter string
          """
          # choose from all lowercase letter
          letters = string.ascii_lowercase
          result_str = "".join(random.choice(letters) for _ in range(length))
          return result_str
  
new_contents: import os
  import time
  import random
  import string
  
  @pytest.fixture(scope="class")
  def delay():
      asyncio.sleep(300)
  
  
  @pytest.mark.usefixtures("delay")
  class CoreTest:
      RUCAPTCHA_KEY = os.getenv("RUCAPTCHA_KEY", "ad9053f3182ca81755768608fa758570")
  
      def get_random_string(self, length: int) -> str:
          """
          Method generate random string with set length
          : param length: Len of generated string
          : return: Random letter string
          """
          # choose from all lowercase letter
          letters = string.ascii_lowercase
          result_str = "".join(random.choice(letters) for _ in range(length))
          return result_str
  
subject: Update conftest.py