Want to run test on postgresql: psycopg2.OperationalError - django

Question

EDIT 1
have added _test.py with postgresql database connexion data but failed when I run I run the command py manage.py test cafe.tests.CafeTestCase --settings=core.settings._test
RuntimeWarning: Normally Django will use a connection to the 'postgres' database to avoid running initialization queries against the production database when it's not needed (for example, when running tests). Django was unable to create a connection to the 'postgres' database and will use the first PostgreSQL database instead.
warnings.warn(
Traceback (most recent call last):
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
self.connect()
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\postgresql\base.py", line 178, in get_new_connection
connection = Database.connect(**conn_params)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\psycopg2\__init__.py", line 127, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\core\management\commands\test.py", line 23, in run_from_argv
super().run_from_argv(argv)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\core\management\commands\test.py", line 53, in handle
failures = test_runner.run_tests(test_labels)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\test\runner.py", line 629, in run_tests
old_config = self.setup_databases(aliases=databases)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\test\runner.py", line 552, in setup_databases
return _setup_databases(
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\test\utils.py", line 170, in setup_databases
connection.creation.create_test_db(
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\creation.py", line 58, in create_test_db
self._create_test_db(verbosity, autoclobber, keepdb)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\creation.py", line 168, in _create_test_db
with self._nodb_connection.cursor() as cursor:
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 256, in cursor
return self._cursor()
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 233, in _cursor
self.ensure_connection()
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
self.connect()
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 217, in ensure_connection
self.connect()
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\base\base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\django\db\backends\postgresql\base.py", line 178, in get_new_connection
connection = Database.connect(**conn_params)
File "D:\Users\jl3\DevSpace\Envs\envIntensecovAPI\lib\site-packages\psycopg2\__init__.py", line 127, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError
I have a Django app set with Docker and different developpement environment: dev, preprod, prod.
I use a postgresql database / pgaadmin 4 in my local Windows environment
I want to write and run tests 'outside' Docker in a VSCode terminal
(because if I use web container to run tests, changes in my tests.py are not updated so I need to down, build and re-run my containers)
so I run the command py manage.py test cafe.tests.CafeTestCase --settings=core.settings.preprod where I speficy the settings to consider
But I got an error sqlite3.OperationalError: no such function: Now because some data migrations use timezone.now() that i not available in sqlite
but I have specify test_database in my settings and given access to user so test should consider postgresql no?
_test.py
DATABASES = {
'default': {
"ENGINE": "django.db.backends.postgresql",
"NAME": "db_preprod",
"USER": "user_preprod",
"PASSWORD": "user_preprod",
"HOST": "localhost",
"PORT": "5433",
'TEST' : {
'NAME': 'test_db_preprod',
}
}
}

Answer 1

so you just have to create the database (or use an existing database) in your _test.py settings

Answer 2

Since SQLite does not provide the now() function, you need to to replace now() by datetime('now')