async def test_merge_streams():
xs = AsyncStream()
s1 = AsyncStream()
s2 = AsyncStream()
ys = merge(xs)
sink = AnonymousAsyncObserver()
sub = await subscribe(ys, sink)
await xs.asend(s1)
await xs.asend(s2)
await s1.asend_at(1, 10)
await s1.asend_at(2, 20)
await s1.asend_at(4, 30)
await s1.aclose_at(6)
await s2.asend_at(0, 40)
await s2.asend_at(3, 50)
await s2.asend_at(5, 60)
await s2.aclose_at(6)
await xs.aclose()
await sub
assert sink.values == [(0, 40), (1, 10), (2, 20), (3, 50), (4, 30),
(5, 60), (6, )]
async def test_unit_happy_resolved_future():
fut = asyncio.Future()
xs = unit(fut)
fut.set_result(42)
lis = AnonymousAsyncObserver()
await run(xs, lis)
assert lis.values == [(0, 42), (0, )]
async def test_unit_happy():
xs = unit(42)
result = []
async def asend(value):
result.append(value)
await run(xs, AnonymousAsyncObserver(asend))
assert result == [42]
async def test_unit_happy_future_resolve():
fut = asyncio.Future()
xs = unit(fut)
lis = AnonymousAsyncObserver()
sub = await subscribe(xs, lis)
fut.set_result(42)
await sub
assert lis.values == [(0, 42), (0, )]
async def test_stream_chain_observer():
xs = AsyncStream()
sink = AnonymousAsyncObserver()
await chain(xs, sink)
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
assert sink.values == [(1, 10), (2, 20)]
async def test_unit_future_cancel():
fut = asyncio.Future()
xs = unit(fut)
lis = AnonymousAsyncObserver()
sub = await subscribe(xs, lis)
fut.cancel()
with pytest.raises(asyncio.CancelledError):
await sub
assert lis.values == [(0, )]
async def test_stream_happy():
xs = AsyncSingleStream()
sink = AnonymousAsyncObserver()
await subscribe(xs, sink)
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
await xs.asend_later(1, 30)
assert sink.values == [(1, 10), (2, 20), (3, 30)]
async def test_unit_future_exception():
fut = asyncio.Future()
ex = Exception("ex")
xs = unit(fut)
lis = AnonymousAsyncObserver()
sub = await subscribe(xs, lis)
fut.set_exception(ex)
with pytest.raises(Exception):
await sub
assert lis.values == [(0, ex)]
async def test_stream_cancel_context():
xs = AsyncSingleStream()
sink = AnonymousAsyncObserver()
with await subscribe(xs, sink):
pass
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
assert sink.values == []
async def test_delay_done():
xs = AsyncStream()
ys = delay(0.5, xs)
lis = AnonymousAsyncObserver()
sub = await subscribe(ys, lis)
await xs.asend_later(0, 10)
await xs.asend_later(1, 20)
await xs.aclose_later(1)
await sub
assert lis.values == [(0.5, 10), (1.5, 20), (2.5, )]
async def test_stream_send_after_close():
xs = AsyncSingleStream()
sink = AnonymousAsyncObserver()
await subscribe(xs, sink)
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
await xs.asend_later(1, 30)
await xs.aclose_later(2)
await xs.asend_later(1, 40)
assert sink.values == [(1, 10), (2, 20), (3, 30), (5, )]
async def test_merge_done():
xs = AsyncStream()
ys = merge(xs)
sink = AnonymousAsyncObserver()
sub = await subscribe(ys, sink)
await xs.asend(from_iterable([10]))
await xs.asend(from_iterable([20]))
await xs.aclose()
await sub
assert sink.values == [(0, 10), (0, 20), (0, )]
async def test_stream_cold_close():
xs = AsyncSingleStream()
sink = AnonymousAsyncObserver()
async def aclose():
await xs.aclose()
asyncio.ensure_future(aclose())
await asyncio.sleep(10)
with await subscribe(xs, sink):
await xs.asend_later(1, 20)
assert sink.values == [(10, )]
async def test_stream_throws():
ex = MyException("ex")
xs = AsyncSingleStream()
sink = AnonymousAsyncObserver()
with pytest.raises(MyException):
sub = await subscribe(xs, sink)
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
await xs.asend_later(1, 30)
await xs.athrow_later(1, ex)
await xs.asend_later(1, 40)
await sub
assert sink.values == [(1, 10), (2, 20), (3, 30), (4, ex)]
async def test_stream_cancel():
xs = AsyncSingleStream()
sub = None
def mapper(value):
return value * 10
ys = map(mapper, xs)
sink = AnonymousAsyncObserver()
sub = await subscribe(ys, sink)
await xs.asend_later(1, 10)
sub.cancel()
await xs.asend_later(1, 20)
assert sink.values == [(1, 100)]
async def test_unit_observer_throws():
error = Exception("error")
xs = unit(42)
result = []
def asend(value):
result.append(value)
raise error
sub = await subscribe(xs, AnonymousAsyncObserver(asend))
try:
await sub
except Exception as ex:
assert ex == error
assert result == [42]
async def test_delay_cancel_before_done():
xs = AsyncStream()
result = []
async def asend(value):
print("Send: %d" % value)
nonlocal result
result.append(value)
ys = delay(0.3, xs)
async with subscribe(ys, AnonymousAsyncObserver(asend)):
await xs.asend(10)
await asyncio.sleep(1.5)
await xs.asend(20)
await asyncio.sleep(1)
assert result == [10]
async def test_stream_cancel_mapper():
xs = AsyncStream()
stream = None
def mapper(value):
stream.cancel()
return value * 10
ys = map(mapper, xs)
sink = AnonymousAsyncObserver()
async with subscribe(ys, sink) as stream:
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
assert sink.values == []
async def test_delay_throw():
xs = AsyncStream()
result = []
async def asend(value):
print("Send: %d" % value)
nonlocal result
result.append(value)
ys = delay(0.3, xs)
await subscribe(ys, AnonymousAsyncObserver(asend))
await xs.asend(10)
await asyncio.sleep(1.5)
await xs.asend(20)
await xs.athrow(Exception('ex'))
await asyncio.sleep(1)
assert result == [10]
async def test_unit_close():
xs = unit(42)
result = []
sub = None
async def asend(value):
result.append(value)
sub.cancel()
await asyncio.sleep(0)
sub = await subscribe(xs, AnonymousAsyncObserver(asend))
try:
await sub
except asyncio.CancelledError:
pass
assert result == [42]
async def test_stream_cancel_asend():
xs = AsyncSingleStream()
sub = None
async def asend(value):
sub.cancel()
await asyncio.sleep(0)
def mapper(value):
return value * 10
ys = map(mapper, xs)
sink = AnonymousAsyncObserver(asend)
async with subscribe(ys, sink) as sub:
await xs.asend_later(1, 10)
await xs.asend_later(1, 20)
assert sink.values == [(1, 100)]
async def test_merge_streams_concat():
s1 = AsyncStream()
s2 = from_iterable([1, 2, 3])
xs = from_iterable([s1, s2])
ys = merge(xs, 1)
sink = AnonymousAsyncObserver()
sub = await subscribe(ys, sink)
await s1.asend_at(1, 10)
await s1.asend_at(2, 20)
await s1.asend_at(4, 30)
await s1.aclose_at(6)
await sub
assert sink.values == [(1, 10), (2, 20), (4, 30), (6, 1), (6, 2), (6, 3),
(6, )]