def test_change_event_hooks(self): # Create the test object and a function listener. foo = Foo() def _on_foo_baz_changed(obj, name, old, new): pass foo.on_trait_change(_on_foo_baz_changed, "baz") # Set the event tracer and trigger a cascade of change events. pre_tracer = self._collect_pre_notification_events post_tracer = self._collect_post_notification_events with trait_notifiers.change_event_tracers(pre_tracer, post_tracer): foo.baz = 3 self.assertEqual(len(self.pre_change_events), 4) self.assertEqual(len(self.post_change_events), 4) expected_pre_events = [ (foo, "baz", 0.0, 3.0, foo._on_baz_change_notification), (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "baz", 0.0, 3.0, _on_foo_baz_changed), ] self.assertEqual(self.pre_change_events, expected_pre_events) expected_post_events = [ (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "baz", 0.0, 3.0, foo._on_baz_change_notification), (foo, "baz", 0.0, 3.0, _on_foo_baz_changed), ] self.assertEqual(self.post_change_events, expected_post_events) self.assertEqual(self.exceptions, [None] * 4) # Check that the tracers are no longer active. foo.baz = 23 self.assertEqual(len(self.pre_change_events), 4) self.assertEqual(len(self.post_change_events), 4)
def test_change_event_hooks(self): # Create the test object and a function listener. foo = Foo() def _on_foo_baz_changed(obj, name, old, new): pass foo.on_trait_change(_on_foo_baz_changed, "baz") # Set the event tracer and trigger a cascade of change events. pre_tracer = self._collect_pre_notification_events post_tracer = self._collect_post_notification_events with trait_notifiers.change_event_tracers(pre_tracer, post_tracer): foo.baz = 3 self.assertEqual(len(self.pre_change_events), 4) self.assertEqual(len(self.post_change_events), 4) expected_pre_events = [ (foo, "baz", 0.0, 3.0, foo._on_baz_change_notification), (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "baz", 0.0, 3.0, _on_foo_baz_changed), ] self.assertEqual(self.pre_change_events, expected_pre_events) expected_post_events = [ (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "baz", 0.0, 3.0, foo._on_baz_change_notification), (foo, "baz", 0.0, 3.0, _on_foo_baz_changed), ] self.assertEqual(self.post_change_events, expected_post_events) self.assertEqual(self.exceptions, [None] * 4) # Check that the tracers are no longer active. foo.baz = 23 self.assertEqual(len(self.pre_change_events), 4) self.assertEqual(len(self.post_change_events), 4)
def test_change_event_hooks_after_exception(self): # Create the test object and a function listener. foo = Foo() def _on_foo_fuz_changed(obj, name, old, new): raise FuzException("function") foo.on_trait_change(_on_foo_fuz_changed, "fuz") # Set the event tracer and trigger a cascade of change events. pre_tracer = self._collect_pre_notification_events post_tracer = self._collect_post_notification_events with trait_notifiers.change_event_tracers(pre_tracer, post_tracer): foo.fuz = 3 self.assertEqual(len(self.pre_change_events), 4) self.assertEqual(len(self.post_change_events), 4) expected_pre_events = [ (foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification), (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed), ] self.assertEqual(self.pre_change_events, expected_pre_events) expected_post_events = [ (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification), (foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed), ] self.assertEqual(self.post_change_events, expected_post_events) self.assertEqual(self.exceptions[:2], [None, None]) self.assertIsInstance(self.exceptions[2], FuzException) self.assertEqual(self.exceptions[2].args, ("method", )) self.assertIsInstance(self.exceptions[3], FuzException) self.assertEqual(self.exceptions[3].args, ("function", ))
def test_change_event_hooks_after_exception(self): # Create the test object and a function listener. foo = Foo() def _on_foo_fuz_changed(obj, name, old, new): raise FuzException("function") foo.on_trait_change(_on_foo_fuz_changed, "fuz") # Set the event tracer and trigger a cascade of change events. pre_tracer = self._collect_pre_notification_events post_tracer = self._collect_post_notification_events with trait_notifiers.change_event_tracers(pre_tracer, post_tracer): foo.fuz = 3 self.assertEqual(len(self.pre_change_events), 4) self.assertEqual(len(self.post_change_events), 4) expected_pre_events = [ (foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification), (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed), ] self.assertEqual(self.pre_change_events, expected_pre_events) expected_post_events = [ (foo, "bar", 0.0, 1.0, foo._bar_changed.__func__), (foo, "bar", 0.0, 1.0, foo._on_bar_change_notification), (foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification), (foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed), ] self.assertEqual(self.post_change_events, expected_post_events) self.assertEqual(self.exceptions[:2], [None, None]) self.assertIsInstance(self.exceptions[2], FuzException) self.assertEqual(self.exceptions[2].args, ("method",)) self.assertIsInstance(self.exceptions[3], FuzException) self.assertEqual(self.exceptions[3].args, ("function",))