tests/lib/test_observer.py

   1 from pathlib import Path
   2 import sys
   3 if '' in sys.path: sys.path.remove('')
   4 sys.path.append(str(Path(__file__).parent.parent.parent))
   5 from unittest import TestCase
   6 from unittest.mock import MagicMock
   7 from ya2.observer import Subject
   8
   9
  10 class Observed(Subject): pass
  11
  12
  13 class Observer:
  14
  15     def __init__(self, observed): self.__observed = observed
  16
  17     def callback(self): pass
  18
  19
  20 class ObserverTests(TestCase):
  21
  22     def test_all(self):
  23         observed = Observed()
  24         observer = Observer(observed)
  25         observer.callback = MagicMock(side_effect=observer.callback)
  26         observer.callback.__name__ = 'callback'
  27         self.assertFalse(observed.observing(observer.callback))
  28         observed.attach(observer.callback)
  29         self.assertTrue(observed.observing(observer.callback))
  30         observer.callback.assert_not_called()
  31         observed.notify('callback')
  32         observer.callback.assert_called()
  33         observed.detach(observer.callback)
  34         self.assertFalse(observed.observing(observer.callback))