Added a fixtures that checks if tasks are still running in tests

[evalott100]

Closes #519

[evalott100]

With the additions in the above the modified test correcly failed with:

ERROR tests/core/test_status.py::test_async_status_exception_timeout - RuntimeError: Not all tasks [<Task cancelling name='Task-1481' coro=<sleep() running at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/tasks.py:639> wait_for=<Future cancelled> cb=[AsyncStatusBase._run_callbacks()]>] closed during test test_async_status_exception_timeout.

Now it's been changed. We still need to track down what's causing the Task destroyed but it is pending - I would assume we need to add the same check to the RunEngine cleanup.

[evalott100]

With the changes to the RunEngine we get explicit errors in the tests creating tasks that aren't awaited/cancelled.

There seems to be some nasty behavior in tests when devices connected to outside the RunEngine loop are used within the RunEngine (I've already corrected some of these tests in the same commit). I did some experimenting to see if could creatively change the RunEngine's event loop to avoid this, but no joy... I'll adjust the rest and see if I can find a way to warn the user if they use devices connected in a different event loop within the RunEngine.

ophyd-async/tests/conftest.py

Lines 98 to 101 in 24c7ccf

	def RE(request: FixtureRequest):
	loop = asyncio.new_event_loop()
	loop.set_debug(True)
	RE = RunEngine({}, call_returns_result=True, loop=loop)

=============================================== short test summary info ===============================================
ERROR tests/epics/adsimdetector/test_sim.py::test_detector_with_unnamed_or_disconnected_config_sigs[-config signal must be named before it is passed to the detector] - RuntimeError: Not all tasks {<Task pending name='Task-8496' coro=<StandardDetector.unstage() running at /scratch/twj43146/Programming/ophyd-async/src/ophyd_async/core/_detector.py:227> wait_for=<Future pending cb=[Task.task_wakeup()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/base_events.py:427> cb=[AsyncStatusBase._run_callbacks()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/tasks.py:374>} closed during test test_detector_with_unnamed_or_disconnected_config_sigs[-config signal must be named before it is passed to the detector].
ERROR tests/epics/adsimdetector/test_sim.py::test_detector_with_unnamed_or_disconnected_config_sigs[some-name-config signal some-name-acquire_time must be connected before it is passed to the detector] - RuntimeError: Not all tasks {<Task pending name='Task-8596' coro=<StandardDetector.unstage() running at /scratch/twj43146/Programming/ophyd-async/src/ophyd_async/core/_detector.py:227> wait_for=<Future pending cb=[Task.task_wakeup()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/base_events.py:427> cb=[AsyncStatusBase._run_callbacks()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/tasks.py:374>} closed during test test_detector_with_unnamed_or_disconnected_config_sigs[some-name-config signal some-name-acquire_time must be connected before it is passed to the detector].
ERROR tests/sim/test_sim_detector.py::test_writes_pattern_to_file - RuntimeError: Not all tasks {<Task pending name='Task-17379' coro=<PatternDetectorController._coroutine_for_image_writing() running at /scratch/twj43146/Programming/ophyd-async/src/ophyd_async/sim/demo/_pattern_detector/_pattern_detector_controller.py:55> wait_for=<Future pending cb=[Task.task_wakeup()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/base_events.py:427> cb=[AsyncStatusBase._run_callbacks()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/tasks.py:374>} closed during test test_writes_pattern_to_file.
ERROR tests/sim/test_streaming_plan.py::test_streaming_plan - RuntimeError: Not all tasks {<Task pending name='Task-17410' coro=<PatternDetectorController._coroutine_for_image_writing() running at /scratch/twj43146/Programming/ophyd-async/src/ophyd_async/sim/demo/_pattern_detector/_pattern_detector_controller.py:55> wait_for=<Future pending cb=[Task.task_wakeup()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/base_events.py:427> cb=[AsyncStatusBase._run_callbacks()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/tasks.py:374>} closed during test test_streaming_plan.
ERROR tests/sim/test_streaming_plan.py::test_plan - RuntimeError: Not all tasks {<Task pending name='Task-17435' coro=<PatternDetectorController._coroutine_for_image_writing() running at /scratch/twj43146/Programming/ophyd-async/src/ophyd_async/sim/demo/_pattern_detector/_pattern_detector_controller.py:55> wait_for=<Future pending cb=[Task.task_wakeup()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/base_events.py:427> cb=[AsyncStatusBase._run_callbacks()] created at /dls_sw/apps/python/miniforge/4.10.0-0/envs/python3.11/lib/python3.11/asyncio/tasks.py:374>} closed during test test_plan.
====================================== 423 passed, 1 skipped, 5 errors in 26.88s ======================================

[evalott100]

Currently, detector controller is only disarmed once:

ophyd-async/src/ophyd_async/core/_detector.py

Lines 202 to 207 in d7f0748

	@AsyncStatus.wrap
	async def stage(self) -> None:
	# Disarm the detector, stop filewriting.
	await self._check_config_sigs()
	await asyncio.gather(self.writer.close(), self.controller.disarm())
	self._trigger_info = None

However it is armed in both trigger and prepare:

ophyd-async/src/ophyd_async/core/_detector.py

Lines 253 to 257 in d7f0748

	# Arm the detector and wait for it to finish.
	indices_written = await self.writer.get_indices_written()
	written_status = await self.controller.arm(
	num=self._trigger_info.number,
	trigger=self._trigger_info.trigger,

ophyd-async/src/ophyd_async/core/_detector.py

Lines 299 to 303 in d7f0748

	self._arm_status = await self.controller.arm(
	num=self._trigger_info.number,
	trigger=self._trigger_info.trigger,
	exposure=self._trigger_info.livetime,
	)

This is the cause of all the test failure's here. We should make a seperate issue for it.

[evalott100]

Interestingly, the standard detector unstage error is only present if debug mode is set to true in the RE event loop, though it will still raise an error from the new clean up logic.

[coretl]

I guess we wait for #542 to be fixed before merging this?