old_contents: """
  Configuration, plugins and fixtures for `pytest`.
  """
  
  import os
  
  import pytest
  
  
  class VuforiaServerCredentials:
      """
      Credentials for VWS APIs.
      """
  
      def __init__(self, access_key: str, secret_key: str) -> None:
          """
          Args:
              access_key: A VWS access key.
              secret_key: A VWS secret key.
  
          Attributes:
              access_key (bytes): A VWS access key.
              secret_key (bytes): A VWS secret key.
          """
          self.access_key = bytes(access_key, encoding='utf-8')  # type: bytes
          self.secret_key = bytes(secret_key, encoding='utf-8')  # type: bytes
  
  
  @pytest.fixture()
  def vuforia_server_credentials() -> VuforiaServerCredentials:
      """
      Return VWS credentials from environment variables.
      """
      credentials = VuforiaServerCredentials(
          access_key=os.environ['VUFORIA_SERVER_ACCESS_KEY'],
          secret_key=os.environ['VUFORIA_SERVER_SECRET_KEY'],
      )
      return credentials
  
new_contents: """
  Configuration, plugins and fixtures for `pytest`.
  """
  
  import os
  
  import pytest
  
  
  class VuforiaServerCredentials:
      """
      Credentials for VWS APIs.
      """
  
      def __init__(self, access_key: str, secret_key: str) -> None:
          """
          Args:
              access_key: A VWS access key.
              secret_key: A VWS secret key.
  
          Attributes:
              access_key (bytes): A VWS access key.
              secret_key (bytes): A VWS secret key.
          """
          self.access_key = bytes(access_key, encoding='utf-8')  # type: bytes
          self.secret_key = bytes(secret_key, encoding='utf-8')  # type: bytes
  
  
  @pytest.fixture()
  def vuforia_server_credentials() -> VuforiaServerCredentials:
      """
      Return VWS credentials from environment variables.
      """
      credentials = VuforiaServerCredentials(
          access_key=os.environ['VUFORIA_SERVER_ACCESS_KEY'],
          secret_key=os.environ['VUFORIA_SERVER_SECRET_KEY'],
      )  # type: VuforiaServerCredentials
      return credentials
  
subject: Add one more type