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import unittest
from typing import Optional
from reactivex import Observable
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
class TestDistinctUntilChanged(unittest.TestCase):
def test_default_if_empty_non_empty1(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 42),
on_next(360, 43),
on_completed(420),
)
def create() -> Observable[Optional[int]]:
return xs.pipe(ops.default_if_empty())
results = scheduler.start(create)
assert results.messages == [
on_next(280, 42),
on_next(360, 43),
on_completed(420),
]
assert xs.subscriptions == [subscribe(200, 420)]
def test_default_if_empty_non_empty2(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(280, 42), on_next(360, 43), on_completed(420)
)
def create():
return xs.pipe(ops.default_if_empty(-1))
results = scheduler.start(create)
assert results.messages == [
on_next(280, 42),
on_next(360, 43),
on_completed(420),
]
assert xs.subscriptions == [subscribe(200, 420)]
def test_default_if_empty_empty1(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_completed(420))
def create():
return xs.pipe(ops.default_if_empty(None))
results = scheduler.start(create)
assert results.messages == [on_next(420, None), on_completed(420)]
assert xs.subscriptions == [subscribe(200, 420)]
def test_default_if_empty_empty2(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_completed(420))
def create():
return xs.pipe(ops.default_if_empty(-1))
results = scheduler.start(create)
assert results.messages == [on_next(420, -1), on_completed(420)]
assert xs.subscriptions == [subscribe(200, 420)]
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