new_contents: from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from unittest import TestCase
  
  from .. import Draft, Color
  
  
  class TestDraft(TestCase):
      def test_basic_tabby(self):
          draft = Draft(num_shafts=2, num_treadles=2)
          black = Color((0, 0, 0))
          draft.add_warp_thread(
              color=black,
              shaft=0,
          )
          draft.add_warp_thread(
              color=black,
              shaft=1,
          )
          draft.add_weft_thread(
              color=black,
              shafts=[0],
          )
          draft.add_weft_thread(
              color=black,
              shafts=[1],
          )
  
subject: Add a trivially basic test