async def test_composite_assertion():
"""Test an assertion that calls sub-assertions.
In early versions of assertion implementation, each `async for`
with a given `stream` created a new generator, but all generators
shared the internal state of the underlying `Assertion` object
in an incorrect way, which could lead to one `async for` seeing
the same event the previous `async for` have seen already. For example,
in the following scenario the event `1` would be seen by three times,
by each invocation of `assert_1`.
"""
events = []
async def assert_1(stream):
async for e in stream:
if e == 1:
return True
return False
async def assert_111(stream):
one = await assert_1(stream)
two = await assert_1(stream)
three = await assert_1(stream)
return one, two, three
assertion = Assertion(events, assert_111)
assertion.start()
events.append(1)
await asyncio.sleep(0.1)
await assertion.update_events()
await asyncio.sleep(0.1)
await assertion.update_events(events_ended=True)
assert assertion.result() == (True, False, False)
async def test_eventually_with_timeout(timeout, accept, result_predicate):
"""Test whether the `eventually` operator handles timeouts correctly."""
events = []
if timeout is not None:
async def func(stream):
return await eventually(stream, lambda e: e % 2 == 0, timeout=timeout)
else:
async def func(stream):
return await eventually(stream, lambda e: e % 2 == 0)
assertion = Assertion(events, func)
assertion.start()
for n in [1, 3, 4, 5]:
await asyncio.sleep(0.1)
events.append(n)
await assertion.update_events()
await assertion.update_events(events_ended=True)
assert assertion.accepted is accept
try:
result = assertion.result()
except Exception as error:
result = error
assert result_predicate(result)
async def test_assertion_consumes_three():
"""Test if an assertion keeps state when events tickle in."""
events = []
async def func(stream):
count = 0
sum = 0
async for e in stream:
sum += e
count += 1
if count == 3:
return sum
assertion = Assertion(events, func)
assertion.start()
events.append(1)
await assertion.update_events()
assert not assertion.done
events.append(2)
await assertion.update_events()
assert not assertion.done
events.append(3)
await assertion.update_events()
assert assertion.accepted
assert assertion.result() == 6
async def test_past_events():
"""Test if `past_events` matches the events given to this assertion before."""
events = []
async def func(stream):
_events = []
async for e in stream:
_events.append(e)
assert _events == stream.past_events
return _events
assertion = Assertion(events, func)
assertion.start()
for n in range(3, 0, -1):
events.append(n)
await assertion.update_events()
await assertion.update_events(events_ended=True)
assert assertion.accepted
assert assertion.result() == [3, 2, 1]
async def test_while_eventually(timeout, accept):
"""Test an assertion that calls `eventually` in a `while` loop.
This test used to fail when the implementation of assertions was not
guaranteed to update the assertion state (in particular, set it as
done) before returning from the `update_events()` method.
"""
events = []
async def func(stream):
while not stream.events_ended:
try:
await eventually(stream, lambda e: e % 2 == 0, timeout=timeout)
except asyncio.TimeoutError:
raise AssertionError("Timeout")
return True
assertion = Assertion(events, func)
assertion.start()
for n in range(5):
await asyncio.sleep(0.2)
events.append(n)
await assertion.update_events()
await asyncio.sleep(0.2)
await assertion.update_events(events_ended=True)
assert assertion.done
assert assertion.accepted == accept
async def test_start_twice_raises():
"""Test whether starting an already started assertion raises a `RuntimeError`."""
events = []
async def func(_stream):
return
assertion = Assertion(events, func)
assertion.start()
with pytest.raises(RuntimeError):
assertion.start()
async def test_wait_for_result_already_done():
"""Test that `wait_for_result()` returns the result of a done assertion."""
async def func(_stream):
return 6
assertion = Assertion([], func)
assertion.start()
result = await assertion.wait_for_result()
assert result == 6
def add_assertion(
self,
assertion_func: AssertionFunction[E],
name: Optional[str] = None,
log_level: LogLevel = logging.INFO,
) -> Assertion:
"""Add an assertion function to this monitor."""
assertion = Assertion(self._events, assertion_func, name=name)
assertion.start()
self._logger.debug("Assertion '%s' started", assertion.name)
self.assertions[assertion] = log_level
return assertion
async def test_wait_for_result_timeout_failure():
"""Test that `wait_for_result` with timeout raises the assertion's exception."""
async def func(stream):
await asyncio.sleep(0.1)
raise AssertionError()
assertion = Assertion([], func)
assertion.start()
assert not assertion.done
with pytest.raises(AssertionError):
await assertion.wait_for_result(timeout=1.0)
async def test_wait_for_result_success():
"""Test that `wait_for_result()` waits for the assertion's result."""
async def func(_stream):
await asyncio.sleep(0.1)
return 7
assertion = Assertion([], func)
assertion.start()
assert not assertion.done
result = await assertion.wait_for_result()
assert result == 7
async def test_wait_for_result_timeout_success():
"""Test that `wait_for_result` with timeout returns the assertion's result."""
async def func(_stream):
await asyncio.sleep(0.1)
return 8
assertion = Assertion([], func)
assertion.start()
assert not assertion.done
result = await assertion.wait_for_result(timeout=1.0)
assert result == 8
async def test_assertion_consumes_one():
"""Test if an assertion will consume all given events."""
events = []
async def func(stream):
async for e in stream:
return e
assertion = Assertion(events, func)
assertion.start()
events.append(2)
await assertion.update_events()
assert assertion.accepted
assert assertion.result() == 2
async def test_assertion_fails_on_event():
"""Test if an assertion is marked as failed when the result is an AssertionError."""
events = [1]
async def func(stream):
async for _ in stream:
assert False, "No events expected"
assertion = Assertion(events, func)
assertion.start()
await assertion.update_events()
assert assertion.failed
with pytest.raises(AssertionError):
_ = assertion.result()
async def test_assertion_end_events():
"""Test if an assertion is accepted and done when no events are passed."""
events = []
async def func(stream):
async for _ in stream:
raise AssertionError("No events expected")
return 44
assertion = Assertion(events, func)
assertion.start()
assert not assertion.done
await assertion.update_events(events_ended=True)
assert assertion.accepted
assert assertion.result() == 44
async def test_result_raises_invalidstateerror():
"""Test that `result()` raises an exception when the result is not ready."""
async def func(stream):
async for e in stream:
if e == 1:
return
assertion = Assertion([], func)
with pytest.raises(asyncio.InvalidStateError):
assertion.result()
assertion.start()
with pytest.raises(asyncio.InvalidStateError):
assertion.result()
# In order not to leave assertion's task pending
await assertion.update_events(events_ended=True)
async def test_assertion_end_events_raises():
"""Test if an assertion raises when events_ended and the assertion is not met."""
events = []
async def func(stream):
async for _ in stream:
return
raise AssertionError("Events expected")
assertion = Assertion(events, func)
assertion.start()
assert not assertion.done
await assertion.update_events(events_ended=True)
assert assertion.failed
with pytest.raises(AssertionError):
assertion.result()
async def test_wait_for_result_timeout_raises():
"""Test that `wait_for_result` with timeout raises TimeoutError."""
async def func(stream):
await asyncio.sleep(1.0)
return 9
assertion = Assertion([], func)
assertion.start()
assert not assertion.done
with pytest.raises(asyncio.TimeoutError):
await assertion.wait_for_result(timeout=0.1)
# Assertion is cancelled and should fail with AssertionError("Assertion cancelled")
assert assertion.failed
with pytest.raises(AssertionError) as error:
_ = assertion.result()
assert "Assertion cancelled" in str(error)
async def test_events_ended_not_set():
"""Test if events_ended is not set when the assertion breaks out of its loop."""
events = [1]
async def func(stream):
assert not stream.events_ended
async for _ in stream:
assert not stream.events_ended
break
assert not stream.events_ended
assertion = Assertion(events, func)
assertion.start()
await assertion.update_events()
assert assertion.done
async def test_events_ended_set():
"""Test if events_ended is set properly throughout the lifetime of an assertion."""
events = [1]
async def func(stream):
assert not stream.events_ended
async for _ in stream:
assert not stream.events_ended
assert stream.events_ended
assertion = Assertion(events, func)
assertion.start()
await assertion.update_events()
await assertion.update_events()
await assertion.update_events(events_ended=True)
assert assertion.done
async def test_assertion_consumes_all():
"""Test if an assertion comsumes all events given to it."""
events = []
async def func(stream):
_events = []
async for e in stream:
_events.append(e)
return _events
assertion = Assertion(events, func)
assertion.start()
for n in range(10):
events.append(n)
await assertion.update_events()
await assertion.update_events(events_ended=True)
assert assertion.done
assert assertion.result() == events
async def test_assertion_accept_immediately():
"""Test if an assertion passes when it accepts immediately."""
events = []
async def func(_stream):
return 43
assertion = Assertion(events, func)
task = assertion.start()
await task
assert assertion.done
assert assertion.accepted
assert assertion.result() == 43
async def test_assertion_accept_with_delay():
"""Test if an assertion passes when it accepts after a delay."""
events = []
async def func(_stream):
await asyncio.sleep(0.2)
return 43
assertion = Assertion(events, func)
task = assertion.start()
await task
assert assertion.done
assert assertion.accepted
assert assertion.result() == 43
async def test_assertion_fail_immediately():
"""Test if an assertion raises AND finishes, when it fails immediately."""
events = []
async def func(_stream):
raise AssertionError()
assertion = Assertion(events, func)
task = assertion.start()
# We do `await` here which causes the exception thrown inside the assertion
# to be re-thrown:
with pytest.raises(AssertionError):
await task
assert assertion.done
assert assertion.failed