old_contents: # -*- coding: utf-8 -*-
  # Author: Florian Mayer <florian.mayer@bitsrc.org>
  
  from __future__ import absolute_import
  
  from sunpy.net import attr
  
  def test_dummyattr():
      one = attr.DummyAttr()
      other = attr.ValueAttr({'a': 'b'})
      assert (one | other) is other
      assert (one & other) is other
  
new_contents: # -*- coding: utf-8 -*-
  # Author: Florian Mayer <florian.mayer@bitsrc.org>
  
  from __future__ import absolute_import
  
  from sunpy.net import attr
  from sunpy.net.vso import attrs
  
  def test_dummyattr():
      one = attr.DummyAttr()
      other = attr.ValueAttr({'a': 'b'})
      assert (one | other) is other
      assert (one & other) is other
  
  def test_and_nesting():
      a = attr.and_(attrs.Level(0),
                    attr.AttrAnd((attrs.Instrument('EVE'),
                                  attrs.Time("2012/1/1", "2012/01/02"))))
      # Test that the nesting has been removed.
      assert len(a.attrs) == 3
  
  def test_or_nesting():
      a = attr.or_(attrs.Instrument('a'),
                    attr.AttrOr((attrs.Instrument('b'),
                                 attrs.Instrument('c'))))
      # Test that the nesting has been removed.
      assert len(a.attrs) == 3
  
subject: Add tests for Attr nesting