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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 TestExpand(unittest.TestCase):
def test_expand_empty(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_completed(300))
def create():
def mapper():
return scheduler.create_cold_observable(
on_next(100, 1), on_next(200, 2), on_completed(300)
)
return xs.pipe(ops.expand(mapper))
results = scheduler.start(create)
assert results.messages == [on_completed(300)]
assert xs.subscriptions == [subscribe(200, 300)]
def test_expand_error(self):
scheduler = TestScheduler()
ex = "ex"
xs = scheduler.create_hot_observable(on_error(300, ex))
def create():
def mapper(x):
return scheduler.create_cold_observable(
on_next(100 + x, 2 * x),
on_next(200 + x, 3 * x),
on_completed(300 + x),
)
return xs.pipe(ops.expand(mapper))
results = scheduler.start(create)
assert results.messages == [on_error(300, ex)]
assert xs.subscriptions == [subscribe(200, 300)]
def test_expand_never(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable()
def create():
def mapper(x):
return scheduler.create_cold_observable(
on_next(100 + x, 2 * x),
on_next(200 + x, 3 * x),
on_completed(300 + x),
)
return xs.pipe(ops.expand(mapper))
results = scheduler.start(create)
assert results.messages == []
assert xs.subscriptions == [subscribe(200, 1000)]
def test_expand_basic(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(550, 1), on_next(850, 2), on_completed(950)
)
def create():
def mapper(x):
return scheduler.create_cold_observable(
on_next(100, 2 * x), on_next(200, 3 * x), on_completed(300)
)
return xs.pipe(ops.expand(mapper))
results = scheduler.start(create)
assert results.messages == [
on_next(550, 1),
on_next(650, 2),
on_next(750, 3),
on_next(750, 4),
on_next(850, 2),
on_next(850, 6),
on_next(850, 6),
on_next(850, 8),
on_next(950, 9),
on_next(950, 12),
on_next(950, 4),
on_next(950, 12),
on_next(950, 12),
on_next(950, 16),
]
assert xs.subscriptions == [subscribe(200, 950)]
def test_expand_on_error(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(550, 1), on_next(850, 2), on_completed(950)
)
def create():
def mapper(x):
raise Exception(ex)
return xs.pipe(ops.expand(mapper))
results = scheduler.start(create)
assert results.messages == [on_next(550, 1), on_error(550, ex)]
assert xs.subscriptions == [subscribe(200, 550)]
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