def METHOD_NAME(self) -> None:
    """Tests that the difficulty values and strings are matched in the
    various constants.
    """
    self.assertEqual(
        constants.constants.SKILL_DIFFICULTIES, [
            constants.constants.SKILL_DIFFICULTY_EASY,
            constants.constants.SKILL_DIFFICULTY_MEDIUM,
            constants.constants.SKILL_DIFFICULTY_HARD])
    self.assertItemsEqual(
        list(constants.constants.SKILL_DIFFICULTY_LABEL_TO_FLOAT.keys()),
        constants.constants.SKILL_DIFFICULTIES)
    self.assertEqual(
        constants.constants.DEFAULT_SKILL_DIFFICULTY,
        constants.constants.SKILL_DIFFICULTY_LABEL_TO_FLOAT[
            constants.constants.SKILL_DIFFICULTY_MEDIUM])