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import pytest
from aiostream import stream, pipe
from aiostream.test_utils import assert_run, event_loop
# Pytest fixtures
assert_run, event_loop
@pytest.mark.asyncio
async def test_concatmap(assert_run, event_loop):
# Concurrent run
with event_loop.assert_cleanup():
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.concatmap(lambda x: stream.range(x, x + 2, interval=5))
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert event_loop.steps == [1, 1, 3, 5, 5]
# Sequential run
with event_loop.assert_cleanup():
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.concatmap(
lambda x: stream.range(x, x + 2, interval=5), task_limit=1
)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert event_loop.steps == [5, 1, 5, 1, 5]
# Limited run
with event_loop.assert_cleanup():
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.concatmap(
lambda x: stream.range(x, x + 2, interval=5), task_limit=2
)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert event_loop.steps == [1, 4, 1, 4, 5]
# Make sure item arrive as soon as possible
with event_loop.assert_cleanup():
xs = stream.just(2)
ys = xs | pipe.concatmap(lambda x: stream.range(x, x + 4, interval=1))
zs = ys | pipe.timeout(2) # Sould NOT raise
await assert_run(zs, [2, 3, 4, 5])
assert event_loop.steps == [1, 1, 1]
# An exception might get discarded if the result can be produced before the
# processing of the exception is required
with event_loop.assert_cleanup():
xs = stream.iterate([True, False])
ys = xs | pipe.concatmap(
lambda x: stream.range(0, 3, interval=1)
if x
else stream.throw(ZeroDivisionError)
)
zs = ys | pipe.take(3)
await assert_run(zs, [0, 1, 2])
assert event_loop.steps == [1, 1]
@pytest.mark.asyncio
async def test_flatmap(assert_run, event_loop):
# Concurrent run
with event_loop.assert_cleanup():
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.flatmap(lambda x: stream.range(x, x + 2, interval=5))
await assert_run(ys, [0, 2, 4, 1, 3, 5])
assert event_loop.steps == [1, 1, 3, 1, 1]
# Sequential run
with event_loop.assert_cleanup():
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.flatmap(
lambda x: stream.range(x, x + 2, interval=5), task_limit=1
)
await assert_run(ys, [0, 1, 2, 3, 4, 5])
assert event_loop.steps == [5, 1, 5, 1, 5]
# Limited run
with event_loop.assert_cleanup():
xs = stream.range(0, 6, 2, interval=1)
ys = xs | pipe.flatmap(
lambda x: stream.range(x, x + 2, interval=5), task_limit=2
)
await assert_run(ys, [0, 2, 1, 3, 4, 5])
assert event_loop.steps == [1, 4, 1, 5]
@pytest.mark.asyncio
async def test_switchmap(assert_run, event_loop):
with event_loop.assert_cleanup():
xs = stream.range(0, 30, 10, interval=3)
ys = xs | pipe.switchmap(lambda x: stream.range(x, x + 5, interval=1))
await assert_run(ys, [0, 1, 2, 10, 11, 12, 20, 21, 22, 23, 24])
assert event_loop.steps == [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# Test cleanup procedure
with event_loop.assert_cleanup():
xs = stream.range(0, 5, interval=1)
ys = xs | pipe.switchmap(lambda x: stream.range(x, x + 2, interval=2))
await assert_run(ys[:3], [0, 1, 2])
assert event_loop.steps == [1, 1]
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