new_contents: import os
  
  import pytest
  
  from vrun import config
  from vrun.compat import ConfigParser
  
  
  @pytest.mark.parametrize('parts, result', [
      (
          ['simple'],
          ['simple']
      ),
      (
          ['multiple', 'simple'],
          ['multiple', 'simple']
      ),
      (
          ['with', '"quotes"'],
          ['with', '"quotes"']
      ),
      (
          ['"testing', 'quote', 'support"'],
          ['testing quote support']
      ),
      (
          ["'testing", 'quote', "support'"],
          ['testing quote support']
      ),
      (
          ['"testing', '\'quote', 'support"'],
          ['testing \'quote support']
      ),
      (
          ['"testing', '\'quote\'', 'support"'],
          ['testing \'quote\' support']
      ),
      (
          ['"testing', '\'quote', '\'support"'],
          ['testing \'quote \'support']
      ),
      (
          ['""'],
          ['""']
      ),
      (
          ['" ', ' "'],
          ['   ']
      ),
  ])
  def test_quoted_combine(parts, result):
      assert list(config.quoted_combine(parts)) == result
  
  
  @pytest.mark.parametrize('parts', [
      ['"testing', '\'quote', '"support"'],
      ['" ', '""'],
      ['"test', '"ing'],
  ])
  def test_quoted_combine_invalid(parts):
      with pytest.raises(ValueError):
          assert list(config.quoted_combine(parts))
  
  
  @pytest.mark.parametrize('folder, result', [
      ('configtest', 'vrun.cfg'),
      ('configtest/vrun_ini', 'vrun.ini'),
      ('configtest/setup_cfg', 'setup.cfg'),
      ('configtest/setup_cfg_no_section', None),
  ])
  def test_find_config(folder, result):
      curpath = os.path.dirname(os.path.realpath(__file__))
  
      cwd = os.path.join(curpath, folder)
  
      if result:
          assert config.find_config(cwd).endswith(result)
      else:
          assert config.find_config(cwd) == result
  
  
  @pytest.mark.parametrize('folder, result', [
      ('configtest', 'vrun.cfg'),
      ('configtest/vrun_ini', 'vrun.ini'),
      ('configtest/setup_cfg', 'setup.cfg'),
  ])
  def test_config_from_file(folder, result):
      curpath = os.path.dirname(os.path.realpath(__file__))
      cwd = os.path.join(curpath, folder)
  
      config_file = config.find_config(cwd)
      assert isinstance(config.config_from_file(config_file), ConfigParser)
  
subject: Add tests for ancillary functions