django/tests/db_utils/tests.py

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"""Tests for django.db.utils."""
import unittest
from django.core.exceptions import ImproperlyConfigured
from django.db import DEFAULT_DB_ALIAS, ProgrammingError, connection
from django.db.utils import ConnectionHandler, load_backend
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from django.test import SimpleTestCase, TestCase
from django.utils.connection import ConnectionDoesNotExist
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class ConnectionHandlerTests(SimpleTestCase):
def test_connection_handler_no_databases(self):
"""
Empty DATABASES and empty 'default' settings default to the dummy
backend.
"""
for DATABASES in (
{}, # Empty DATABASES setting.
{"default": {}}, # Empty 'default' database.
):
with self.subTest(DATABASES=DATABASES):
self.assertImproperlyConfigured(DATABASES)
def assertImproperlyConfigured(self, DATABASES):
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conns = ConnectionHandler(DATABASES)
self.assertEqual(
conns[DEFAULT_DB_ALIAS].settings_dict["ENGINE"], "django.db.backends.dummy"
)
msg = (
"settings.DATABASES is improperly configured. Please supply the "
"ENGINE value. Check settings documentation for more details."
)
with self.assertRaisesMessage(ImproperlyConfigured, msg):
conns[DEFAULT_DB_ALIAS].ensure_connection()
def test_no_default_database(self):
DATABASES = {"other": {}}
conns = ConnectionHandler(DATABASES)
msg = "You must define a 'default' database."
with self.assertRaisesMessage(ImproperlyConfigured, msg):
conns["other"].ensure_connection()
def test_databases_property(self):
# The "databases" property is maintained for backwards compatibility
# with 3rd party packages. It should be an alias of the "settings"
# property.
conn = ConnectionHandler({})
self.assertNotEqual(conn.settings, {})
self.assertEqual(conn.settings, conn.databases)
def test_nonexistent_alias(self):
msg = "The connection 'nonexistent' doesn't exist."
conns = ConnectionHandler(
{
DEFAULT_DB_ALIAS: {"ENGINE": "django.db.backends.dummy"},
}
)
with self.assertRaisesMessage(ConnectionDoesNotExist, msg):
conns["nonexistent"]
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class DatabaseErrorWrapperTests(TestCase):
@unittest.skipUnless(connection.vendor == "postgresql", "PostgreSQL test")
def test_reraising_backend_specific_database_exception(self):
with connection.cursor() as cursor:
msg = 'table "X" does not exist'
with self.assertRaisesMessage(ProgrammingError, msg) as cm:
cursor.execute('DROP TABLE "X"')
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self.assertNotEqual(type(cm.exception), type(cm.exception.__cause__))
self.assertIsNotNone(cm.exception.__cause__)
self.assertIsNotNone(cm.exception.__cause__.pgcode)
self.assertIsNotNone(cm.exception.__cause__.pgerror)
class LoadBackendTests(SimpleTestCase):
def test_load_backend_invalid_name(self):
msg = (
"'foo' isn't an available database backend or couldn't be "
"imported. Check the above exception. To use one of the built-in "
"backends, use 'django.db.backends.XXX', where XXX is one of:\n"
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" 'mysql', 'oracle', 'postgresql', 'sqlite3'"
)
with self.assertRaisesMessage(ImproperlyConfigured, msg) as cm:
load_backend("foo")
self.assertEqual(str(cm.exception.__cause__), "No module named 'foo'")