def setup_class(self):
self.initial_elements = [
R(1, 1, 10, 10),
R(2, 2, 20, 20),
R(3, 3, 30, 30),
]
self.changelist = [ Insert(R(4, 4, 40, 40)) ] # used for commit later
self.counter = 0
self.received_events = []
def on_change(event):
self.counter += 1
self.received_events += [event]
self.eb = EventBus()
self.model = CanvasModel(self.eb)
self.eb.register(Model_Changed, on_change)
class Test_CanvasModel(object):
def setup_class(self):
self.initial_elements = [
R(1, 1, 10, 10),
R(2, 2, 20, 20),
R(3, 3, 30, 30),
]
self.changelist = [ Insert(R(4, 4, 40, 40)) ] # used for commit later
self.counter = 0
self.received_events = []
def on_change(event):
self.counter += 1
self.received_events += [event]
self.eb = EventBus()
self.model = CanvasModel(self.eb)
self.eb.register(Model_Changed, on_change)
def test_setting_elems_updates_elems(self):
to_give = self.initial_elements[:] # copy
self.model.elems = to_give
assert to_give == self.initial_elements # model didn't change given
assert self.model.elems == self.initial_elements
assert self.model._elems == self.initial_elements
def test_setting_elems_updates_changelog(self):
assert self.model._changelog == [
[
Insert(R(1, 1, 10, 10)),
Insert(R(2, 2, 20, 20)),
Insert(R(3, 3, 30, 30)),
],
]
def test_setting_elems_informs_listeners(self):
assert self.counter == 1
assert len(self.received_events) == 1
assert self.received_events[0].data == self.model._changelog[0]
def test_cant_modify_elems_through_getter(self):
self.model.elems[1] = 'abc'
self.model.elems.pop(0)
assert self.model.elems == self.initial_elements
def test_cant_inject_changes_to_changelog_through_event(self):
evt = self.received_events[0]
backup = evt.data[0]
evt.data[0] == 'abc'
assert self.model._changelog == [
[
Insert(R(1, 1, 10, 10)),
Insert(R(2, 2, 20, 20)),
Insert(R(3, 3, 30, 30)),
],
]
evt.data[0] = backup
def test_commit(self):
self.model.commit(self.changelist)
def test_commit_informs_listeners(self):
assert self.counter == 2
assert len(self.received_events) == 2
assert self.received_events[1].data == [ Insert(R(4, 4, 40, 40)) ]
def test_commit_updates_elems(self):
assert self.model._elems == [
R(1, 1, 10, 10),
R(2, 2, 20, 20),
R(3, 3, 30, 30),
R(4, 4, 40, 40),
]
assert self.model.elems == self.model._elems
def test_commit_updates_changelog(self):
assert self.model._changelog == [
[
Insert(R(1, 1, 10, 10)),
Insert(R(2, 2, 20, 20)),
Insert(R(3, 3, 30, 30)),
],
[
Insert(R(4, 4, 40, 40)),
]
]
def test_modify_changes_in_changelog_through_commit_argument(self):
self.changelist[0] = 'abc'
assert self.model._changelog == [
[
Insert(R(1, 1, 10, 10)),
Insert(R(2, 2, 20, 20)),
Insert(R(3, 3, 30, 30)),
],
[
Insert(R(4, 4, 40, 40)),
]
]
self.changelist.pop(0)
assert self.model._changelog == [
[
Insert(R(1, 1, 10, 10)),
Insert(R(2, 2, 20, 20)),
Insert(R(3, 3, 30, 30)),
],
[
Insert(R(4, 4, 40, 40)),
]
]
assert self.received_events[1].data == [ Insert(R(4, 4, 40, 40)) ]
