def test_early_terminating_transducer(self):
input = [0.0, 0.2, 0.8, 0.9, 1.1, 2.3, 2.6, 3.0, 4.1]
output = SingularSink()
iterable_source(iterable=input,
target=transduce(first(lambda x: x > 1.0),
target=output()))
self.assertEqual(output.value, 1.1)
def test_two_items_causes_completion(self):
singular_sink = SingularSink()
transduce(Transducer,
sending(),
[23, 78],
init=singular_sink())
self.assertTrue(singular_sink.has_value)
def test_one_sent_item_has_value(self):
singular_sink = SingularSink()
sink = singular_sink()
sink.send(78)
self.assertTrue(singular_sink.has_value)
def test_closed_target_exits_with_remaining_items(self):
items = [4, 7, 2, 1, 4]
collection = SingularSink()
sink = collection()
remaining = poisson_source(1e6, items, sink)
self.assertListEqual(list(remaining), [7, 2, 1, 4])
def test_zero_sent_items_has_no_value(self):
singular_sink = SingularSink()
sink = singular_sink()
self.assertFalse(singular_sink.has_value)
def test_closed_sink_raises_stop_iteration(self):
singular_sink = SingularSink()
sink = singular_sink()
sink.close()
with self.assertRaises(StopIteration):
sink.send(42)
def test_two_items_sent_raises_stop_iteration(self):
singular_sink = SingularSink()
sink = singular_sink()
sink.send(342)
with self.assertRaises(StopIteration):
sink.send(124)
def test_one_sent_item_can_be_retrieved(self):
singular_sink = SingularSink()
sink = singular_sink()
sink.send(496)
self.assertEqual(singular_sink.value, 496)
def test_no_items_raises_runtime_error(self):
singular_sink = SingularSink()
sink = singular_sink()
with self.assertRaises(RuntimeError):
_ = singular_sink.value