Reorganized backends tests.

tests/backends/postgresql/tests.py

@@ -0,0 +1,147 @@
+import unittest
+import warnings
+from unittest import mock
+
+from django.db import DatabaseError, connection
+from django.test import TestCase
+
+
+@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL tests')
+class Tests(TestCase):
+
+    def test_nodb_connection(self):
+        """
+        The _nodb_connection property fallbacks to the default connection
+        database when access to the 'postgres' database is not granted.
+        """
+        def mocked_connect(self):
+            if self.settings_dict['NAME'] is None:
+                raise DatabaseError()
+            return ''
+
+        nodb_conn = connection._nodb_connection
+        self.assertIsNone(nodb_conn.settings_dict['NAME'])
+
+        # Now assume the 'postgres' db isn't available
+        with warnings.catch_warnings(record=True) as w:
+            with mock.patch('django.db.backends.base.base.BaseDatabaseWrapper.connect',
+                            side_effect=mocked_connect, autospec=True):
+                warnings.simplefilter('always', RuntimeWarning)
+                nodb_conn = connection._nodb_connection
+        self.assertIsNotNone(nodb_conn.settings_dict['NAME'])
+        self.assertEqual(nodb_conn.settings_dict['NAME'], connection.settings_dict['NAME'])
+        # Check a RuntimeWarning has been emitted
+        self.assertEqual(len(w), 1)
+        self.assertEqual(w[0].message.__class__, RuntimeWarning)
+
+    def test_connect_and_rollback(self):
+        """
+        PostgreSQL shouldn't roll back SET TIME ZONE, even if the first
+        transaction is rolled back (#17062).
+        """
+        new_connection = connection.copy()
+        try:
+            # Ensure the database default time zone is different than
+            # the time zone in new_connection.settings_dict. We can
+            # get the default time zone by reset & show.
+            cursor = new_connection.cursor()
+            cursor.execute("RESET TIMEZONE")
+            cursor.execute("SHOW TIMEZONE")
+            db_default_tz = cursor.fetchone()[0]
+            new_tz = 'Europe/Paris' if db_default_tz == 'UTC' else 'UTC'
+            new_connection.close()
+
+            # Invalidate timezone name cache, because the setting_changed
+            # handler cannot know about new_connection.
+            del new_connection.timezone_name
+
+            # Fetch a new connection with the new_tz as default
+            # time zone, run a query and rollback.
+            with self.settings(TIME_ZONE=new_tz):
+                new_connection.set_autocommit(False)
+                cursor = new_connection.cursor()
+                new_connection.rollback()
+
+                # Now let's see if the rollback rolled back the SET TIME ZONE.
+                cursor.execute("SHOW TIMEZONE")
+                tz = cursor.fetchone()[0]
+                self.assertEqual(new_tz, tz)
+
+        finally:
+            new_connection.close()
+
+    def test_connect_non_autocommit(self):
+        """
+        The connection wrapper shouldn't believe that autocommit is enabled
+        after setting the time zone when AUTOCOMMIT is False (#21452).
+        """
+        new_connection = connection.copy()
+        new_connection.settings_dict['AUTOCOMMIT'] = False
+
+        try:
+            # Open a database connection.
+            new_connection.cursor()
+            self.assertFalse(new_connection.get_autocommit())
+        finally:
+            new_connection.close()
+
+    def test_connect_isolation_level(self):
+        """
+        The transaction level can be configured with
+        DATABASES ['OPTIONS']['isolation_level'].
+        """
+        import psycopg2
+        from psycopg2.extensions import (
+            ISOLATION_LEVEL_READ_COMMITTED as read_committed,
+            ISOLATION_LEVEL_SERIALIZABLE as serializable,
+        )
+        # Since this is a django.test.TestCase, a transaction is in progress
+        # and the isolation level isn't reported as 0. This test assumes that
+        # PostgreSQL is configured with the default isolation level.
+
+        # Check the level on the psycopg2 connection, not the Django wrapper.
+        default_level = read_committed if psycopg2.__version__ < '2.7' else None
+        self.assertEqual(connection.connection.isolation_level, default_level)
+
+        new_connection = connection.copy()
+        new_connection.settings_dict['OPTIONS']['isolation_level'] = serializable
+        try:
+            # Start a transaction so the isolation level isn't reported as 0.
+            new_connection.set_autocommit(False)
+            # Check the level on the psycopg2 connection, not the Django wrapper.
+            self.assertEqual(new_connection.connection.isolation_level, serializable)
+        finally:
+            new_connection.close()
+
+    def _select(self, val):
+        with connection.cursor() as cursor:
+            cursor.execute('SELECT %s', (val,))
+            return cursor.fetchone()[0]
+
+    def test_select_ascii_array(self):
+        a = ['awef']
+        b = self._select(a)
+        self.assertEqual(a[0], b[0])
+
+    def test_select_unicode_array(self):
+        a = ['ᄲawef']
+        b = self._select(a)
+        self.assertEqual(a[0], b[0])
+
+    def test_lookup_cast(self):
+        from django.db.backends.postgresql.operations import DatabaseOperations
+        do = DatabaseOperations(connection=None)
+        lookups = (
+            'iexact', 'contains', 'icontains', 'startswith', 'istartswith',
+            'endswith', 'iendswith', 'regex', 'iregex',
+        )
+        for lookup in lookups:
+            with self.subTest(lookup=lookup):
+                self.assertIn('::text', do.lookup_cast(lookup))
+
+    def test_correct_extraction_psycopg2_version(self):
+        from django.db.backends.postgresql.base import psycopg2_version
+        with mock.patch('psycopg2.__version__', '4.2.1 (dt dec pq3 ext lo64)'):
+            self.assertEqual(psycopg2_version(), (4, 2, 1))
+        with mock.patch('psycopg2.__version__', '4.2b0.dev1 (dt dec pq3 ext lo64)'):
+            self.assertEqual(psycopg2_version(), (4, 2))