new_contents: from setuptools.dist import Distribution
  from setuptools.command.build import build
  
  
  def test_distribution_gives_setuptools_build_obj(tmpdir_cwd):
      """
      Check that the setuptools Distribution uses the
      setuptools specific build object.
      """
      dist = Distribution(dict(
          script_name='setup.py',
          script_args=['build'],
          packages=[''],
          package_data={'': ['path/*']},
      ))
      assert isinstance(dist.get_command_obj("build"), build)
  
subject: Add a simple test for setuptools.command.build