old_contents: from bukkit import Collection
  
  
  def test_creation():
      buckets = Collection(rate=5, limit=23, timeout=31, clock=lambda: 0)
      assert buckets.rate == 5
      assert buckets.limit == 23
      assert buckets.timeout == 31
      assert buckets.head_node.prev_node is buckets.tail_node
      assert buckets.tail_node.next_node is buckets.head_node
  
new_contents: from bukkit import Collection
  
  
  def test_creation():
      buckets = Collection(rate=5, limit=23, timeout=31, clock=lambda: 0)
      assert buckets.rate == 5
      assert buckets.limit == 23
      assert buckets.timeout == 31
      assert buckets.head_node.prev_node is buckets.tail_node
      assert buckets.tail_node.next_node is buckets.head_node
  
  
  def test_contains():
      buckets = Collection(rate=5, limit=23, timeout=31, clock=lambda: 0)
  
      assert len(buckets.node_map) == 0
      assert 'thingy' not in buckets
      buckets.consume('thingy', 5)
      assert len(buckets.node_map) == 1
      assert 'thingy' in buckets
  
  
  def test_get():
      buckets = Collection(rate=5, limit=23, timeout=31, clock=lambda: 0)
  
      try:
          buckets['thingy']
          assert False, "Should not be able to look up 'thingy'"
      except IndexError, exc:
          assert str(exc) == "No such bucket: 'thingy'"
  
      buckets.consume('thingy', 5)
      assert buckets['thingy'].tokens == 18
  
subject: Make sure getting buckets and checking for their presence work.