new_contents: import pytest
  
  from pikepdf import Array, Dictionary, NameTree, Object, Pdf
  
  # pylint: disable=redefined-outer-name
  
  
  @pytest.fixture
  def outline(resources):
      with Pdf.open(resources / 'outlines.pdf') as pdf:
          yield pdf
  
  
  def test_nametree_crud(outline):
      nt = NameTree(outline.Root.Names.Dests, outline)
      assert nt.obj == outline.Root.Names.Dests
      assert '0' in nt
      assert isinstance(nt['0'], Object)
      assert 'foo' not in nt
  
      assert '3' in nt
      del nt['3']
      assert '3' not in nt
  
      nt['3'] = Dictionary(Entry=3)
      assert nt['3'].Entry == 3
  
      nt['newentry'] = Array([42])
      assert nt['newentry'] == Array([42])
  
  
  def test_nametree_iter(outline):
      count = 0
      nt = NameTree(outline.Root.Names.Dests, outline)
      for name in nt:
          count += 1
          assert name in nt
      assert count == len(nt)
  
      assert '1' in nt.keys()
      assert len(nt.keys()) == len(nt.values()) == len(nt.items())
      assert nt == NameTree(outline.Root.Names.Dests, outline)
  
subject: Add tests for nametree