def test_add_middle_mergeable(self):
history = UndoHistory()
example = SimpleExample(str_value='foo', value=10)
undo_item = UndoItem(
object=example,
name='str_value',
old_value='bar',
new_value='baz',
)
history.add(
UndoItem(
object=example,
name='str_value',
old_value='foo',
new_value='bar',
))
history.add(
UndoItem(
object=example,
name='str_value',
old_value='bar',
new_value='wombat',
), )
history.undo()
with self.assertTraitDoesNotChange(history, 'undoable'):
with self.assertTraitChanges(history, 'redoable', count=1):
history.add(undo_item)
self.assertEqual(history.now, 1)
self.assertTrue(history.can_undo)
self.assertFalse(history.can_redo)
def test_undo_last(self):
history = UndoHistory()
self._populate_history(history)
with self.assertTraitDoesNotChange(history, 'undoable'):
with self.assertTraitChanges(history, 'redoable', count=1):
with self.assertTraitChanges(self._example,
'anytrait',
count=1): # noqa: E501
history.undo()
self.assertEqual(history.now, 2)
self.assertTrue(history.can_undo)
self.assertTrue(history.can_redo)
def test_clear_middle(self):
history = UndoHistory()
self._populate_history(history)
history.undo()
history.undo()
with self.assertTraitChanges(history, 'redoable', count=1):
with self.assertTraitChanges(history, 'undoable', count=1):
with self.assertTraitDoesNotChange(self._example, 'anytrait'):
history.clear()
self.assertEqual(history.now, 0)
self.assertFalse(history.can_undo)
self.assertFalse(history.can_redo)
def test_revert_middle(self):
history = UndoHistory()
self._populate_history(history)
history.undo()
history.undo()
with self.assertTraitChanges(history, 'redoable', count=1):
with self.assertTraitChanges(history, 'undoable', count=1):
with self.assertTraitChanges(self._example,
'anytrait',
count=1): # noqa: E501
history.revert()
self.assertEqual(history.now, 0)
self.assertFalse(history.can_undo)
self.assertFalse(history.can_redo)
