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import math
import unittest
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_defaultcomparer_all_distinct(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 4),
on_next(300, 2),
on_next(350, 1),
on_next(380, 3),
on_next(400, 5),
on_completed(420),
)
def create():
return xs.pipe(ops.distinct())
results = scheduler.start(create)
assert results.messages == [
on_next(280, 4),
on_next(300, 2),
on_next(350, 1),
on_next(380, 3),
on_next(400, 5),
on_completed(420),
]
assert xs.subscriptions == [subscribe(200, 420)]
def test_distinct_default_comparer_some_duplicates(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 4),
on_next(300, 2),
on_next(350, 2),
on_next(380, 3),
on_next(400, 4),
on_completed(420),
)
def create():
return xs.pipe(ops.distinct())
results = scheduler.start(create)
assert results.messages == [
on_next(280, 4),
on_next(300, 2),
on_next(380, 3),
on_completed(420),
]
assert xs.subscriptions == [subscribe(200, 420)]
def test_distinct_key_mapper_all_distinct(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 8),
on_next(300, 4),
on_next(350, 2),
on_next(380, 6),
on_next(400, 10),
on_completed(420),
)
def create():
def key_mapper(x):
return x / 2
return xs.pipe(ops.distinct(key_mapper))
results = scheduler.start(create)
assert results.messages == [
on_next(280, 8),
on_next(300, 4),
on_next(350, 2),
on_next(380, 6),
on_next(400, 10),
on_completed(420),
]
assert xs.subscriptions == [subscribe(200, 420)]
def test_distinct_key_mapper_some_duplicates(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 4),
on_next(300, 2),
on_next(350, 3),
on_next(380, 7),
on_next(400, 5),
on_completed(420),
)
def create():
def key_mapper(x):
return math.floor(x / 2.0)
return xs.pipe(ops.distinct(key_mapper))
results = scheduler.start(create)
assert results.messages == [
on_next(280, 4),
on_next(300, 2),
on_next(380, 7),
on_completed(420),
]
assert xs.subscriptions == [subscribe(200, 420)]
def test_distinct_key_mapper_throws(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 3),
on_next(300, 2),
on_next(350, 1),
on_next(380, 0),
on_next(400, 4),
on_completed(420),
)
def create():
def key_mapper(x):
if not x:
raise Exception(ex)
else:
return math.floor(x / 2.0)
return xs.pipe(ops.distinct(key_mapper))
results = scheduler.start(create)
assert results.messages == [on_next(280, 3), on_next(350, 1), on_error(380, ex)]
assert xs.subscriptions == [subscribe(200, 380)]
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