old_contents: from nex import box
  
  
  def test_glue_flex():
      h_box = box.HBox(contents=[box.Glue(dimen=100, stretch=50, shrink=20),
                                 box.Glue(dimen=10, stretch=350, shrink=21)],
                       set_glue=False)
      assert h_box.stretch == [50 + 350]
      assert h_box.shrink == [20 + 21]
  
  
  def test_glue_flex_set():
      h_box = box.HBox(contents=[box.Glue(dimen=100, stretch=50, shrink=20),
                                 box.Glue(dimen=10, stretch=350, shrink=21)],
                       set_glue=True)
      assert h_box.stretch == [0]
      assert h_box.shrink == [0]
  
new_contents: from nex.dampf.dvi_document import DVIDocument
  from nex import box, box_writer
  
  
  def test_glue_flex():
      h_box = box.HBox(contents=[box.Glue(dimen=100, stretch=50, shrink=20),
                                 box.Glue(dimen=10, stretch=350, shrink=21)],
                       set_glue=False)
      assert h_box.stretch == [50 + 350]
      assert h_box.shrink == [20 + 21]
  
  
  def test_glue_flex_set():
      h_box = box.HBox(contents=[box.Glue(dimen=100, stretch=50, shrink=20),
                                 box.Glue(dimen=10, stretch=350, shrink=21)],
                       set_glue=True)
      assert h_box.stretch == [0]
      assert h_box.shrink == [0]
  
  
  def test_box_writer():
      doc = DVIDocument(magnification=1000)
      lay_list = [
          box.Rule(1, 1, 1),
          box.Glue(1, 2, 3),
          box.HBox([
              box.Glue(3, 2, 1),
              box.Rule(3, 3, 3),
          ]),
      ]
      box_writer.write_box_to_doc(doc, lay_list)
  
subject: Add basic test for box writer