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test_observer.py
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29 lines (20 loc) · 860 Bytes
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from unittest.mock import patch, Mock
import pytest
from patterns.behavioral.observer import Data, DecimalViewer, HexViewer
@pytest.fixture
def observable():
return Data('some data')
def test_attach_detach(observable):
decimal_viewer = DecimalViewer()
assert len(observable._observers) == 0
observable.attach(decimal_viewer)
assert decimal_viewer in observable._observers
observable.detach(decimal_viewer)
assert decimal_viewer not in observable._observers
def test_one_data_change_notifies_each_observer_once(observable):
observable.attach(DecimalViewer())
observable.attach(HexViewer())
with patch('patterns.behavioral.observer.DecimalViewer.update', new_callable=Mock()) as mocked_update:
assert mocked_update.call_count == 0
observable.data = 10
assert mocked_update.call_count == 1