async def test_withlatestfrom_never_never():
xs = never()
ys = never()
result = []
async def asend(value):
nonlocal result
asyncio.sleep(0.1)
result.append(value)
zs = with_latest_from(lambda x, y: x + y, ys, xs)
await subscribe(zs, AsyncAnonymousObserver(asend))
await asyncio.sleep(1)
assert result == []
async def test_withlatestfrom_never_empty():
xs = empty()
ys = never()
result = []
async def asend(value):
log.debug("test_withlatestfrom_never_empty:asend(%s)", value)
nonlocal result
asyncio.sleep(0.1)
result.append(value)
zs = with_latest_from(lambda x, y: x + y, ys, xs)
try:
await run(zs, AsyncAnonymousObserver(asend))
except asyncio.CancelledError:
pass
assert result == []
async def test_withlatestfrom_done():
xs = AsyncStream()
ys = AsyncStream()
result = []
async def asend(value):
log.debug("test_withlatestfrom_done:asend(%s)", value)
nonlocal result
asyncio.sleep(0.1)
result.append(value)
zs = with_latest_from(lambda x, y: x + y, ys, xs)
sub = await subscribe(zs, AnonymousAsyncObserver(asend))
await xs.asend(1)
await ys.asend(2)
await xs.asend(3)
await xs.aclose()
await sub
assert result == [5]
def with_latest_from(self, mapper, other) -> 'ChainedAsyncObservable':
from aioreactive.operators.with_latest_from import with_latest_from
return ChainedAsyncObservable(with_latest_from(mapper, other, self))