new_contents: from unittest import TestCase
  
  from opencog.atomspace import AtomSpace, TruthValue, Atom
  from opencog.atomspace import types, is_a, get_type, get_type_name, create_child_atomspace
  
  from opencog.type_constructors import *
  from opencog.utilities import initialize_opencog, finalize_opencog
  
  from time import sleep
  
  class AtomSpaceTest(TestCase):
  
      def setUp(self):
          self.space = AtomSpace()
          initialize_opencog(self.space)
  
      def tearDown(self):
          finalize_opencog()
          del self.space
  
      def test_attention_value(self):
          node = Node("test")
  
          # check values come back as assigned
          node.sti = 1
          node.lti = 2
          node.vlti = 3
          assert node.sti == 1
          assert node.lti == 2
          assert node.vlti == 3
  
          # Check increment and decrement for vlti
          node.decrement_vlti()
          assert node.vlti == 2
          node.increment_vlti()
          assert node.vlti == 3
  
          # Check dictionary setting and getting of av property.
          node.av = {"sti": 4, "lti": 5, "vlti": 6}
          assert node.sti == 4
          assert node.lti == 5
          assert node.vlti == 6
          assert node.av == {"sti": 4, "lti": 5, "vlti": 6}
  
      def test_get_by_av(self):
          a1 = ConceptNode("test1")
          a2 = ConceptNode("test2")
          a3 = InheritanceLink(a1, a2)
          a4 = ConceptNode("test4")
          a5 = ConceptNode("test5")
  
          a1.sti = 10
          a2.sti = 5
          a3.sti = 4
          a4.sti = 1
  
          #ImportanceIndex is Asynchronus give it some time
          sleep(1)
  
          result = self.space.get_atoms_by_av(4, 10)
          print ("The atoms-by-av result is ", result)
          assert len(result) == 3
          assert set(result) == set([a1, a2, a3])
          assert a4 not in result
  
          result = self.space.get_atoms_in_attentional_focus()
          assert len(result) == 4
          assert set(result) == set([a1, a2, a3, a4])
  
subject: Move over attention-bank tests