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import unittest
from reactivex import Observable, never
from reactivex import operators as _
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 TestScan(unittest.TestCase):
def test_scan_seed_never(self):
scheduler = TestScheduler()
seed = 42
def create():
def func(acc: int, x: int) -> int:
return acc + x
return never().pipe(_.scan(seed=seed, accumulator=func))
results = scheduler.start(create)
assert results.messages == []
def test_scan_seed_empty(self):
scheduler = TestScheduler()
seed = 42
xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))
def create():
return xs.pipe(_.scan(lambda acc, x: acc + x, seed=seed))
results = scheduler.start(create).messages
assert len(results) == 1
assert results[0].value.kind == "C" and results[0].time == 250
def test_scan_seed_return(self):
scheduler = TestScheduler()
seed = 42
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(220, 2), on_completed(250)
)
def create():
return xs.pipe(_.scan(lambda acc, x: acc + x, seed=seed))
results = scheduler.start(create).messages
assert len(results) == 2
assert (
results[0].value.kind == "N"
and results[0].value.value == seed + 2
and results[0].time == 220
)
assert results[1].value.kind == "C" and results[1].time == 250
def test_scan_seed_on_error(self):
ex = "ex"
scheduler = TestScheduler()
seed = 42
xs = scheduler.create_hot_observable(on_next(150, 1), on_error(250, ex))
def create() -> Observable[int]:
return xs.pipe(_.scan(lambda acc, x: acc + x, seed))
results = scheduler.start(create).messages
assert len(results) == 1
assert (
results[0].value.kind == "E"
and str(results[0].value.exception) == ex
and results[0].time == 250
)
def test_scan_seed_somedata(self):
scheduler = TestScheduler()
seed = 1
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(_.scan(lambda acc, x: acc + x, seed=seed))
results = scheduler.start(create).messages
assert len(results) == 5
assert (
results[0].value.kind == "N"
and results[0].value.value == seed + 2
and results[0].time == 210
)
assert (
results[1].value.kind == "N"
and results[1].value.value == seed + 2 + 3
and results[1].time == 220
)
assert (
results[2].value.kind == "N"
and results[2].value.value == seed + 2 + 3 + 4
and results[2].time == 230
)
assert (
results[3].value.kind == "N"
and results[3].value.value == seed + 2 + 3 + 4 + 5
and results[3].time == 240
)
assert results[4].value.kind == "C" and results[4].time == 250
def test_scan_noseed_never(self):
scheduler = TestScheduler()
def create() -> Observable[int]:
return never().pipe(_.scan(lambda acc, x: acc + x))
results = scheduler.start(create)
assert results.messages == []
def test_scan_noseed_empty(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(150, 1), on_completed(250))
def create() -> Observable[int]:
return xs.pipe(_.scan(lambda acc, x: acc + x))
results = scheduler.start(create).messages
assert len(results) == 1
assert results[0].value.kind == "C" and results[0].time == 250
def test_scan_noseed_return(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(
on_next(150, 1), on_next(220, 2), on_completed(250)
)
def create() -> Observable[int]:
def func(acc: int, x: int) -> int:
if acc is None:
acc = 0
return acc + x
return xs.pipe(_.scan(accumulator=func))
results = scheduler.start(create).messages
assert len(results) == 2
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_scan_noseed_on_error(self):
ex = "ex"
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(150, 1), on_error(250, ex))
def create() -> Observable[int]:
def func(acc: int, x: int) -> int:
if acc is None:
acc = 0
return acc + x
return xs.pipe(_.scan(func))
results = scheduler.start(create).messages
assert len(results) == 1
assert (
results[0].value.kind == "E"
and results[0].time == 250
and str(results[0].value.exception) == ex
)
def test_scan_noseed_somedata(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 func(acc, x):
if acc is None:
acc = 0
return acc + x
return xs.pipe(_.scan(func))
results = scheduler.start(create).messages
assert len(results) == 5
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 + 3
)
assert (
results[2].value.kind == "N"
and results[2].time == 230
and results[2].value.value == 2 + 3 + 4
)
assert (
results[3].value.kind == "N"
and results[3].time == 240
and results[3].value.value == 2 + 3 + 4 + 5
)
assert results[4].value.kind == "C" and results[4].time == 250
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