text: import pytest
  from lbrc_flask.formatters import format_yesno
  
  
  @pytest.mark.parametrize(
      ["input", "output"],
      [
          (None, ''),
          ('', ''),
          ("0", 'No'),
          (0, 'No'),
          ("False", 'No'),
          ("false", 'No'),
          (False, 'No'),
          (True, 'Yes'),
          ('True', 'Yes'),
          ('true', 'Yes'),
          ('1', 'Yes'),
          (1, 'Yes'),
      ],
  )
  def test__format_yesno__None(input, output):
      assert format_yesno(input) == output
  