new_contents: # -*- coding: utf-8 -*-
  import pytest
  
  from marshmallow_jsonapi import fields, utils
  
  
  def test_get_dump_key():
      field = fields.Integer(dump_to='new_key', data_key='new_key')  # 2.X vs 3.X
      assert utils.get_dump_key(field) == 'new_key'
  
  
  @pytest.mark.parametrize('tag,val', [
      ('<id>', 'id'),
      ('<author.last_name>', 'author.last_name'),
      ('<comment.author.first_name>', 'comment.author.first_name'),
      ('True', None),
      ('', None),
  ])
  def test_tpl(tag, val):
      assert utils.tpl(tag) == val
  
subject: Add tests for utils