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[2.0.x] Added assertion helpers for PostgreSQL's server-side cursor tests. 

Backport of 6cb6382639 from master
This commit is contained in:
Tim Graham 2017-11-21 08:11:50 -05:00
parent 205290f510
commit d380afc6a5
1 changed files with 17 additions and 23 deletions
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40
tests/backends/postgresql/test_server_side_cursors.py
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@ -37,29 +37,28 @@ class ServerSideCursorsPostgres(TestCase):
connection.settings_dict[setting] = kwargs[setting]
yield
def test_server_side_cursor(self):
persons = Person.objects.iterator()
next(persons) # Open a server-side cursor
def assertUsesCursor(self, queryset, num_expected=1):
next(queryset) # Open a server-side cursor
cursors = self.inspect_cursors()
self.assertEqual(len(cursors), 1)
self.assertIn('_django_curs_', cursors[0].name)
self.assertFalse(cursors[0].is_scrollable)
self.assertFalse(cursors[0].is_holdable)
self.assertFalse(cursors[0].is_binary)
def test_server_side_cursor_many_cursors(self):
persons = Person.objects.iterator()
persons2 = Person.objects.iterator()
next(persons) # Open a server-side cursor
next(persons2) # Open a second server-side cursor
cursors = self.inspect_cursors()
self.assertEqual(len(cursors), 2)
self.assertEqual(len(cursors), num_expected)
for cursor in cursors:
self.assertIn('_django_curs_', cursor.name)
self.assertFalse(cursor.is_scrollable)
self.assertFalse(cursor.is_holdable)
self.assertFalse(cursor.is_binary)
def asserNotUsesCursor(self, queryset):
self.assertUsesCursor(queryset, num_expected=0)
def test_server_side_cursor(self):
self.assertUsesCursor(Person.objects.iterator())
def test_server_side_cursor_many_cursors(self):
persons = Person.objects.iterator()
persons2 = Person.objects.iterator()
next(persons) # Open a server-side cursor
self.assertUsesCursor(persons2, num_expected=2)
def test_closed_server_side_cursor(self):
persons = Person.objects.iterator()
next(persons) # Open a server-side cursor
@ -70,13 +69,8 @@ class ServerSideCursorsPostgres(TestCase):
def test_server_side_cursors_setting(self):
with self.override_db_setting(DISABLE_SERVER_SIDE_CURSORS=False):
persons = Person.objects.iterator()
next(persons) # Open a server-side cursor
cursors = self.inspect_cursors()
self.assertEqual(len(cursors), 1)
self.assertUsesCursor(persons)
del persons # Close server-side cursor
with self.override_db_setting(DISABLE_SERVER_SIDE_CURSORS=True):
persons = Person.objects.iterator()
next(persons) # Should not open a server-side cursor
cursors = self.inspect_cursors()
self.assertEqual(len(cursors), 0)
self.asserNotUsesCursor(Person.objects.iterator())