def test_lazy_parent_is_not_none_but_returns_none_parent_lazy_is_set(self):
# given
def parent_source():
return None
# when
task = Task('task', lazy={'parent': parent_source})
# then
self.assertIsNone(task._parent)
self.assertIs(parent_source, task._parent_lazy)
self.assertIsNone(task._parent_lazy())
def test_lazy_parent_returns_object_parent_lazy_is_set(self):
# given
parent = Task('parent')
def parent_source():
return parent
# when
task = Task('task', lazy={'parent': parent_source})
# then
self.assertIsNone(task._parent)
self.assertIs(parent_source, task._parent_lazy)
self.assertIs(parent, task._parent_lazy())
def test_accessing_parent_populates_it_and_removes_parent_lazy(self):
# given
parent = Task('parent')
def parent_source():
return parent
task = Task('task', lazy={'parent': parent_source})
# precondition
self.assertIsNone(task._parent)
self.assertIs(parent_source, task._parent_lazy)
self.assertIs(parent, task._parent_lazy())
# when
result = task.parent
# then
self.assertIs(parent, result)
self.assertIs(parent, task._parent)
self.assertIsNone(task._parent_lazy)
