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