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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 TestFirst_or_default(unittest.TestCase):
def test_first_or_default_async_empty(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))
def create():
return xs.pipe(ops.first_or_default(None, 0))
res = scheduler.start(create=create)
assert res.messages == [on_next(250, 0), on_completed(250)]
assert xs.subscriptions == [subscribe(200, 250)]
def test_first_or_default_async_one(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(210, 2), on_completed(250)
)
def create():
return xs.pipe(ops.first_or_default(None, 0))
res = scheduler.start(create=create)
assert res.messages == [on_next(210, 2), on_completed(210)]
assert xs.subscriptions == [subscribe(200, 210)]
def test_first_or_default_async_many(self):
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.first_or_default(None, 0))
res = scheduler.start(create=create)
assert res.messages == [on_next(210, 2), on_completed(210)]
assert xs.subscriptions == [subscribe(200, 210)]
def test_first_or_default_async_error(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(150, 1), on_error(210, ex))
def create():
return xs.pipe(ops.first_or_default(None, 0))
res = scheduler.start(create=create)
assert res.messages == [on_error(210, ex)]
assert xs.subscriptions == [subscribe(200, 210)]
def test_first_or_default_async_predicate(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():
def predicate(x):
return x % 2 == 1
return xs.pipe(ops.first_or_default(predicate, 0))
res = scheduler.start(create=create)
assert res.messages == [on_next(220, 3), on_completed(220)]
assert xs.subscriptions == [subscribe(200, 220)]
def test_first_or_default_async_predicate_none(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():
def predicate(x):
return x > 10
return xs.pipe(ops.first_or_default(predicate, 0))
res = scheduler.start(create=create)
assert res.messages == [on_next(250, 0), on_completed(250)]
assert xs.subscriptions == [subscribe(200, 250)]
def test_first_or_default_async_predicate_on_error(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(210, 2), on_error(220, ex)
)
def create():
def predicate(x):
return x % 2 == 1
return xs.pipe(ops.first_or_default(predicate, 0))
res = scheduler.start(create=create)
assert res.messages == [on_error(220, ex)]
assert xs.subscriptions == [subscribe(200, 220)]
def test_first_or_default_async_predicate_throws(self):
ex = "ex"
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():
def predicate(x):
if x < 4:
return False
else:
raise Exception(ex)
return xs.pipe(ops.first_or_default(predicate, 0))
res = scheduler.start(create=create)
assert res.messages == [on_error(230, ex)]
assert xs.subscriptions == [subscribe(200, 230)]
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