tests/specs/model/observable_spec.py

   1 import unittest
   2 from mock import Mock
   3 from model.observable import ObservableList
   4
   5 class ObservableListBehaviour(unittest.TestCase):
   6     def setUp(self):
   7         self.list = ObservableList()
   8         self.observer = Mock()
   9         self.list.observers.append(self.observer)
  10
  11     def add_item(self):
  12         p = Mock()
  13         self.list.append(p)
  14         return p
  15
  16     def assert_observed(self,name,new=None,old=None):
  17         self.observer.notify.assert_called_with(self.list,name,new=new,old=old)
  18
  19     def test_should_be_iterable(self):
  20         for item in self.list:
  21             pass
  22
  23     def test_should_notify_observers_if_item_was_added(self):
  24         p = self.add_item()
  25         self.assert_observed('add_item',new=p,old=None)
  26
  27     def test_should_remember_added_items(self):
  28         p = self.add_item()
  29         self.assertTrue(p in self.list)
  30
  31
  32
  33 class EmptyObservableListBehaviour(ObservableListBehaviour):
  34
  35     def test_should_be_empty(self):
  36         self.assertEqual(len(self.list),0)
  37
  38     def test_should_raise_exception_when_trying_to_remove_a_item(self):
  39         self.assertRaises(ValueError,self.list.remove,Mock())
  40
  41
  42
  43 class NotEmptyObservableListBehaviour(ObservableListBehaviour):
  44
  45     def setUp(self):
  46         super(NotEmptyObservableListBehaviour,self).setUp()
  47         self.add_item()
  48
  49     def test_should_notify_observers_if_item_was_removed(self):
  50         i = self.list[0]
  51         self.list.remove(i)
  52         self.assert_observed('remove_item', i, None)