def tasks_not_lingering(request, loop, event_loop, _recorded_tasks_at_startup):
allow_lingering_tasks = False
allow_count = 0
marks = request.node.get_closest_marker('allow_lingering_tasks')
if marks:
allow_lingering_tasks = True
allow_count = marks.kwargs.get('count', 0)
try:
yield
finally:
tasks_then = request.node._tasks_at_startup
tasks_now = set(all_tasks(loop=loop))
if tasks_then != tasks_now:
request.node._tasks_at_startup = tasks_now
pending = {task for task in tasks_now if task and not task.done()}
if pending:
diff = len(pending - tasks_then)
if not allow_lingering_tasks or diff > allow_count:
raise DirtyTest(
'Left over tasks',
os.environ.get('PYTEST_CURRENT_TEST'),
_compare_eq_set(tasks_now, tasks_then, verbose=2))
def _recorded_tasks_at_startup(request, loop):
try:
request.node._tasks_at_startup
except AttributeError:
request.node._tasks_at_startup = set(all_tasks(loop=loop))
