def test_late_attach(self):
defer = Defer()
promise = defer.promise
defer.resolve(16)
callback = mock.MagicMock()
promise.then(callback)
callback.assert_called_with(16)
def test_simple(self):
defer = Defer()
promise = defer.promise
callback_1 = mock.MagicMock()
callback_2 = mock.MagicMock()
promise.then(callback_1)
promise.then(callback_2)
defer.resolve(5)
callback_1.assert_called_with(5)
callback_2.assert_called_with(5)
def test_late_attach_chained(self):
defer = Defer()
promise_1 = defer.promise
defer.resolve(24)
promise_2 = promise_1.then(lambda x: x + 2)
callback = mock.MagicMock()
promise_2.then(callback)
callback.assert_called_with(26)
def test_chained(self):
defer = Defer()
promise_1 = defer.promise
promise_2 = promise_1.then(lambda x: x + 1)
callback = mock.MagicMock()
promise_2.then(callback)
defer.resolve(7)
callback.assert_called_with(8)
def test_double_resolve(self):
defer = Defer()
defer.resolve(2)
self.assertRaises(DuplicateResolutionError, lambda: defer.resolve(3))