new_contents: from debile.utils.commands import run_command
  from debile.utils.commands import safe_run
  from debile.utils.deb822 import Changes
  
  def test_run_command():
      run_command("ls")
      run_command("cat","foo")
      (output, output_stderr, exit_status) = run_command("ls2")
      assert exit_status != 0
  
  
  
  def test_safe_run():
      safe_run("ls",expected=0)
      safe_run("ls",expected=0)
      safe_run("cat","foo")
      (output, output_stderr, exit_status) = safe_run("ls2",expected=-1)
      assert exit_status != 0
  
  
  def test_deb822():
      files = Changes(open("tests/samples/morse-simulator_1.2.1-2_amd64.changes", "r")).get("Files", [])
  
subject: add a unit tests