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Add test for ObservableDeferred
's cancellation behaviour (#12149)
Signed-off-by: Sean Quah <seanq@element.io>
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changelog.d/12149.misc
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changelog.d/12149.misc
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Add test for `ObservableDeferred`'s cancellation behaviour.
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@ -100,6 +100,34 @@ class ObservableDeferredTest(TestCase):
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self.assertEqual(str(results[0].value), "gah!", "observer 1 errback result")
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self.assertEqual(str(results[0].value), "gah!", "observer 1 errback result")
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self.assertEqual(str(results[1].value), "gah!", "observer 2 errback result")
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self.assertEqual(str(results[1].value), "gah!", "observer 2 errback result")
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def test_cancellation(self):
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"""Test that cancelling an observer does not affect other observers."""
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origin_d: "Deferred[int]" = Deferred()
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observable = ObservableDeferred(origin_d, consumeErrors=True)
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observer1 = observable.observe()
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observer2 = observable.observe()
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observer3 = observable.observe()
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self.assertFalse(observer1.called)
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self.assertFalse(observer2.called)
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self.assertFalse(observer3.called)
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# cancel the second observer
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observer2.cancel()
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self.assertFalse(observer1.called)
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self.failureResultOf(observer2, CancelledError)
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self.assertFalse(observer3.called)
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# other observers resolve as normal
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origin_d.callback(123)
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self.assertEqual(observer1.result, 123, "observer 1 callback result")
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self.assertEqual(observer3.result, 123, "observer 3 callback result")
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# additional observers resolve as normal
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observer4 = observable.observe()
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self.assertEqual(observer4.result, 123, "observer 4 callback result")
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class TimeoutDeferredTest(TestCase):
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class TimeoutDeferredTest(TestCase):
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def setUp(self):
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def setUp(self):
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