def test_run_already_handled_event(self, app_context: ApplicationContext):
"""Tests that you can't run the same types of callbacks twice."""
yield from app_context.run_callbacks(ContextEventType.started)
with pytest.raises(ValueError) as exc:
yield from app_context.run_callbacks(ContextEventType.started)
assert str(exc.value) == 'the started callbacks for this context have already been run'
def test_add_already_handled_event(self, app_context: ApplicationContext):
"""Tests that you can't add a callback to an event that's already been handled."""
yield from app_context.run_callbacks(ContextEventType.started)
exc = pytest.raises(ValueError, app_context.add_callback, ContextEventType.started,
lambda ctx: None)
assert str(exc.value) == 'cannot add started callbacks to this context any more'
