def test_stack_maxsize():
s = Stack(maxsize=10)
[s.add("action {0:d}".format(i)) for i in xrange(20)]
assert len(s.get_stack()) == 10
assert s.get_current() == "action 19"
assert s.can_undo() == True
assert s.can_redo() == False
[s.undo() for _ in xrange(10)]
assert s.can_undo() == False
assert s.can_redo() == True
def test_stack1():
s = Stack()
assert s.get_current() == None
assert s.can_undo() == False
assert s.can_redo() == False
s.add("action 0")
assert s.can_undo() == True
assert s.can_redo() == False
s.add("action 1")
s.add("action 2")
assert s.get_current() == "action 2"
assert s.can_undo() == True
assert s.can_redo() == False
s.undo()
assert s.get_current() == "action 1"
assert s.can_undo() == True
assert s.can_redo() == True
s.redo()
assert s.get_current() == "action 2"
assert s.can_undo() == True
assert s.can_redo() == False
s.undo()
s.undo()
s.add("action 1 bis")
assert s.get_current() == "action 1 bis"
assert s.can_undo() == True
assert s.can_redo() == False
s.undo()
assert s.get_current() == "action 0"
assert s.can_undo() == True
assert s.can_redo() == True
def __init__(self, loader):
self.loader = loader
self.processor = Processor(loader)
# Create the action stack.
self.stack = Stack(maxsize=20)
