Postgresql connections not being dropped between tests about django-apscheduler HOT 4 CLOSED

Django==2.0.4
PostgreSQL 10.1, compiled by Visual C++ build 1800, 64-bit

Testing started at 5:18 PM ...
...\Scripts\python.exe "...\pycharm\django_test_manage.py" test accounts.tests ...\Django\project
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
Destroying test database for alias 'default'...
Traceback (most recent call last):
  File "...\project\Lib\site-packages\django\db\backends\utils.py", line 83, in _execute
    return self.cursor.execute(sql)
psycopg2.OperationalError: database "test_projectdb" is being accessed by other users
DETAIL:  There is 1 other session using the database.


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "...\helpers\pycharm\django_test_manage.py", line 168, in <module>
    utility.execute()
  File "...\helpers\pycharm\django_test_manage.py", line 142, in execute
    _create_command().run_from_argv(self.argv)
  File "...\project\Lib\site-packages\django\core\management\commands\test.py", line 26, in run_from_argv
    super().run_from_argv(argv)
  File "...\project\Lib\site-packages\django\core\management\base.py", line 288, in run_from_argv
    self.execute(*args, **cmd_options)
  File "...\project\Lib\site-packages\django\core\management\base.py", line 335, in execute
    output = self.handle(*args, **options)
  File "...\pycharm\django_test_manage.py", line 104, in handle
    failures = TestRunner(test_labels, **options)
  File "...\pycharm\django_test_runner.py", line 255, in run_tests
    extra_tests=extra_tests, **options)
  File "...\pycharm\django_test_runner.py", line 156, in run_tests
    return super(DjangoTeamcityTestRunner, self).run_tests(test_labels, extra_tests, **kwargs)
  File "...\project\Lib\site-packages\django\test\runner.py", line 604, in run_tests
    self.teardown_databases(old_config)
  File "...\project\Lib\site-packages\django\test\runner.py", line 577, in teardown_databases
    keepdb=self.keepdb,
  File "...\project\Lib\site-packages\django\test\utils.py", line 299, in teardown_databases
    connection.creation.destroy_test_db(old_name, verbosity, keepdb)
  File "...\project\Lib\site-packages\django\db\backends\base\creation.py", line 259, in destroy_test_db
    self._destroy_test_db(test_database_name, verbosity)
  File "...\project\Lib\site-packages\django\db\backends\base\creation.py", line 276, in _destroy_test_db
    % self.connection.ops.quote_name(test_database_name))
  File "...\project\Lib\site-packages\django\db\backends\utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "...\project\Lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "...\project\Lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "...\project\Lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "...\project\Lib\site-packages\django\db\backends\utils.py", line 83, in _execute
    return self.cursor.execute(sql)
django.db.utils.OperationalError: database "test_projectdb" is being accessed by other users
DETAIL:  There is 1 other session using the database.


Process finished with exit code 1

Testing started at 5:33 PM ...
...\Scripts\python.exe "...\pycharm\django_test_manage.py" test accounts.tests ...
Creating test database for alias 'default'...
Got an error creating the test database: database "test_projectdb" already exists

Type 'yes' if you would like to try deleting the test database 'test_projectdb', or 'no' to cancel: yes
Destroying old test database for alias 'default'...
System check identified no issues (0 silenced).
Destroying test database for alias 'default'...

import sys

from apscheduler.jobstores.memory import MemoryJobStore
from apscheduler.schedulers.background import BackgroundScheduler
from django_apscheduler.jobstores import DjangoJobStore, register_events


scheduler = BackgroundScheduler()
if 'test' in sys.argv:
    scheduler.add_jobstore(MemoryJobStore(), 'default')
else:  # pragma: no cover
    scheduler.add_jobstore(DjangoJobStore(), 'default')
register_events(scheduler)
scheduler.start()

def tearDown(self):
    ...
    scheduler.shutdown(wait=10)