[Python] Docker sqlite3.OperationalError: unable to open database file

I know there are more similar questions but none of them solve the problem that I am having. I have assembled a very basic Python application with Flask:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
return 'HELLO WORLD!'

app.run(host='0.0.0.0', port=8000)


Where older I have created a false unit test:

def calc(x, y):
return x + y

def test_calc():
assert 5 == calc(2, 3)


What I really want to create is a CI that creates a docker image, do the tests, and then post the docker image to Docker Hub but running this command to run the tests docker-compose run app sh -c "pytest test.py --cov -p no:cacheprovider" I get the error:

test.py . [100%]
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/_pytest/main.py", line 240, in wrap_session
INTERNALERROR> session.exitstatus = doit(config, session) or 0
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/_pytest/main.py", line 296, in _main
INTERNALERROR> config.hook.pytest_runtestloop(session=session)
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pluggy/hooks.py", line 286, in __call__
INTERNALERROR> return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pluggy/manager.py", line 93, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pluggy/manager.py", line 84, in <lambda>
INTERNALERROR> self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pluggy/callers.py", line 203, in _multicall
INTERNALERROR> gen.send(outcome)
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pytest_cov/plugin.py", line 271, in pytest_runtestloop
INTERNALERROR> self.cov_controller.finish()
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pytest_cov/engine.py", line 44, in ensure_topdir_wrapper
INTERNALERROR> return meth(self, *args, **kwargs)
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/pytest_cov/engine.py", line 229, in finish
INTERNALERROR> self.cov.stop()
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/control.py", line 658, in save
INTERNALERROR> data = self.get_data()
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/control.py", line 716, in get_data
INTERNALERROR> if self._collector and self._collector.flush_data():
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/collector.py", line 442, in flush_data
INTERNALERROR> self.covdata.add_lines(self.mapped_file_dict(self.data))
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/sqldata.py", line 437, in add_lines
INTERNALERROR> self._choose_lines_or_arcs(lines=True)
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/sqldata.py", line 494, in _choose_lines_or_arcs
INTERNALERROR> with self._connect() as con:
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/sqldata.py", line 299, in _connect
INTERNALERROR> self._create_db()
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/sqldata.py", line 248, in _create_db
INTERNALERROR> with db:
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/sqldata.py", line 1026, in __enter__
INTERNALERROR> self._connect()
INTERNALERROR> File "/usr/local/lib/python3.8/site-packages/coverage/sqldata.py", line 1008, in _connect
INTERNALERROR> self.con = sqlite3.connect(filename, check_same_thread=False)
INTERNALERROR> sqlite3.OperationalError: unable to open database file

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