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import unittest
import reactivex
from reactivex import operators as ops
from reactivex.testing import ReactiveTest, TestScheduler
on_next = ReactiveTest.on_next
on_completed = ReactiveTest.on_completed
on_error = ReactiveTest.on_error
subscribe = ReactiveTest.subscribe
subscribed = ReactiveTest.subscribed
disposed = ReactiveTest.disposed
created = ReactiveTest.created
class RxException(Exception):
pass
# Helper function for raising exceptions within lambdas
def _raise(ex):
raise RxException(ex)
class TestDistinctUntilChanged(unittest.TestCase):
def test_distinct_until_changed_never(self):
scheduler = TestScheduler()
def create():
return reactivex.never().pipe(ops.distinct_until_changed())
results = scheduler.start(create)
assert results.messages == []
def test_distinct_until_changed_empty(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))
def create():
return xs.pipe(ops.distinct_until_changed())
results = scheduler.start(create).messages
self.assertEqual(1, len(results))
assert results[0].value.kind == "C" and results[0].time == 250
def test_distinct_until_changed_return(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(220, 2), on_completed(250)
)
def create():
return xs.pipe(ops.distinct_until_changed())
results = scheduler.start(create).messages
self.assertEqual(2, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 220
and results[0].value.value == 2
)
assert results[1].value.kind == "C" and results[1].time == 250
def test_distinct_until_changed_on_error(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(150, 1), on_error(250, ex))
def create():
return xs.pipe(ops.distinct_until_changed())
results = scheduler.start(create).messages
self.assertEqual(1, len(results))
assert (
results[0].value.kind == "E"
and results[0].time == 250
and str(results[0].value.exception) == ex
)
def test_distinct_until_changed_all_changes(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1),
on_next(210, 2),
on_next(220, 3),
on_next(230, 4),
on_next(240, 5),
on_completed(250),
)
def create():
return xs.pipe(ops.distinct_until_changed())
results = scheduler.start(create).messages
self.assertEqual(5, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 210
and results[0].value.value == 2
)
assert (
results[1].value.kind == "N"
and results[1].time == 220
and results[1].value.value == 3
)
assert (
results[2].value.kind == "N"
and results[2].time == 230
and results[2].value.value == 4
)
assert (
results[3].value.kind == "N"
and results[3].time == 240
and results[3].value.value == 5
)
assert results[4].value.kind == "C" and results[4].time == 250
def test_distinct_until_changed_all_same(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1),
on_next(210, 2),
on_next(220, 2),
on_next(230, 2),
on_next(240, 2),
on_completed(250),
)
def create():
return xs.pipe(ops.distinct_until_changed())
results = scheduler.start(create).messages
self.assertEqual(2, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 210
and results[0].value.value == 2
)
assert results[1].value.kind == "C" and results[1].time == 250
def test_distinct_until_changed_some_changes(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1),
on_next(210, 2),
on_next(215, 3),
on_next(220, 3),
on_next(225, 2),
on_next(230, 2),
on_next(230, 1),
on_next(240, 2),
on_completed(250),
)
def create():
return xs.pipe(ops.distinct_until_changed())
results = scheduler.start(create).messages
self.assertEqual(6, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 210
and results[0].value.value == 2
)
assert (
results[1].value.kind == "N"
and results[1].time == 215
and results[1].value.value == 3
)
assert (
results[2].value.kind == "N"
and results[2].time == 225
and results[2].value.value == 2
)
assert (
results[3].value.kind == "N"
and results[3].time == 230
and results[3].value.value == 1
)
assert (
results[4].value.kind == "N"
and results[4].time == 240
and results[4].value.value == 2
)
assert results[5].value.kind == "C" and results[5].time == 250
def test_distinct_until_changed_comparer_all_equal(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1),
on_next(210, 2),
on_next(220, 3),
on_next(230, 4),
on_next(240, 5),
on_completed(250),
)
def create():
return xs.pipe(ops.distinct_until_changed(comparer=lambda x, y: True))
results = scheduler.start(create).messages
self.assertEqual(2, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 210
and results[0].value.value == 2
)
assert results[1].value.kind == "C" and results[1].time == 250
def test_distinct_until_changed_comparer_all_different(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1),
on_next(210, 2),
on_next(220, 2),
on_next(230, 2),
on_next(240, 2),
on_completed(250),
)
def create():
return xs.pipe(ops.distinct_until_changed(comparer=lambda x, y: False))
results = scheduler.start(create).messages
self.assertEqual(5, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 210
and results[0].value.value == 2
)
assert (
results[1].value.kind == "N"
and results[1].time == 220
and results[1].value.value == 2
)
assert (
results[2].value.kind == "N"
and results[2].time == 230
and results[2].value.value == 2
)
assert (
results[3].value.kind == "N"
and results[3].time == 240
and results[3].value.value == 2
)
assert results[4].value.kind == "C" and results[4].time == 250
def test_distinct_until_changed_key_mapper_div2(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1),
on_next(210, 2),
on_next(220, 4),
on_next(230, 3),
on_next(240, 5),
on_completed(250),
)
def create():
return xs.pipe(ops.distinct_until_changed(lambda x: x % 2))
results = scheduler.start(create).messages
self.assertEqual(3, len(results))
assert (
results[0].value.kind == "N"
and results[0].time == 210
and results[0].value.value == 2
)
assert (
results[1].value.kind == "N"
and results[1].time == 230
and results[1].value.value == 3
)
assert results[2].value.kind == "C" and results[2].time == 250
def test_distinct_until_changed_key_mapper_throws(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(210, 2), on_completed(250)
)
def create():
return xs.pipe(ops.distinct_until_changed(lambda x: _raise(ex)))
results = scheduler.start(create)
assert results.messages == [on_error(210, ex)]
def test_distinct_until_changed_comparer_throws(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(210, 2), on_next(220, 3), on_completed(250)
)
def create():
return xs.pipe(
ops.distinct_until_changed(comparer=lambda x, y: _raise(ex)),
)
results = scheduler.start(create)
assert results.messages == [on_next(210, 2), on_error(220, ex)]
|
