text: # coding=utf-8
  from __future__ import absolute_import, division, print_function, \
      unicode_literals
  
  from typing import Optional, Text
  
  import filters as f
  from filters.macros import filter_macro
  
  
  # noinspection PyClassHasNoInit
  class TestFilterAlpha(f.BaseFilter):
      """
      A filter that can be used for testing.
      """
      def _apply(self, value):
          return value
  
  
  # noinspection PyClassHasNoInit
  class TestFilterBravo(f.BaseFilter):
      """
      A filter that will can be used for testing.
      """
      def __init__(self, name=None):
          # type: (Optional[Text]) -> None
          super(TestFilterBravo, self).__init__()
  
          self.name = name
  
      def _apply(self, value):
          return value
  
  
  @filter_macro
  def TestFilterCharlie():
      """
      A filter macro that can be used for testing.
      """
      return f.NoOp
  