def test_chained_transducers(self):
input = [0.0, 0.2, 0.8, 0.9, 1.1, 2.3, 2.6, 3.0, 4.1]
output = CollectingSink()
iterable_source(iterable=input,
target=transduce(
compose(pairwise(),
mapping(lambda p: p[1] - p[0]),
filtering(lambda d: d < 0.5),
mapping(lambda _: "double-click")),
target=output()))
result = list(output)
self.assertListEqual(result, ['double-click', 'double-click', 'double-click', 'double-click', 'double-click'])
def test_chained_transducers(self):
input = [0.0, 0.2, 0.8, 0.9, 1.1, 2.3, 2.6, 3.0, 4.1]
output = CollectingSink()
iterable_source(iterable=input,
target=transduce(compose(
pairwise(), mapping(lambda p: p[1] - p[0]),
filtering(lambda d: d < 0.5),
mapping(lambda _: "double-click")),
target=output()))
result = list(output)
self.assertListEqual(result, [
'double-click', 'double-click', 'double-click', 'double-click',
'double-click'
])
def test_pairwise_single(self):
"""A single item fed into pairwise is discarded."""
result = transduce(transducer=pairwise(),
reducer=appending(),
iterable=[42])
self.assertListEqual(result, [])
def test_pairwise_at_least_two(self):
result = transduce(transducer=pairwise(),
reducer=appending(),
iterable=[1, 3, 5, 7, 2, 1, 9])
self.assertListEqual(result, [(1, 3), (3, 5), (5, 7), (7, 2), (2, 1),
(1, 9)])
def test_pairwise_single(self):
"""A single item fed into pairwise is discarded."""
result = transduce(transducer=pairwise(),
reducer=appending(),
iterable=[42])
self.assertListEqual(result, [])
def test_pairwise_at_least_two(self):
result = transduce(transducer=pairwise(),
reducer=appending(),
iterable=[1, 3, 5, 7, 2, 1, 9])
self.assertListEqual(result, [(1, 3), (3, 5), (5, 7), (7, 2), (2, 1), (1, 9)])
