tests: Remove unused ujson imports.

zerver/tests/test_attachments.py

@@ -3,7 +3,6 @@ from __future__ import absolute_import
 from __future__ import print_function
 
 import mock
-import ujson
 
 from typing import Any
 

zerver/tests/test_external.py

@@ -21,7 +21,6 @@ from zerver.lib.test_classes import (
 import DNS
 import mock
 import time
-import ujson
 
 from six.moves import urllib
 from six.moves import range

zerver/tests/test_notifications.py

@@ -3,7 +3,6 @@ from __future__ import print_function
 
 import random
 import re
-import ujson
 
 from django.conf import settings
 from django.core import mail

zerver/tests/test_presence.py

@@ -26,7 +26,6 @@ from zerver.models import (
 )
 
 import datetime
-import ujson
 
 class ActivityTest(ZulipTestCase):
     def test_activity(self):

zerver/tests/test_realm_emoji.py

@@ -5,7 +5,6 @@ from zerver.lib.actions import get_realm, check_add_realm_emoji
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.test_helpers import get_test_image_file, get_user
 from zerver.models import RealmEmoji
-import ujson
 
 class RealmEmojiTest(ZulipTestCase):
 

zerver/tests/test_realm_filters.py

@@ -4,8 +4,6 @@ from __future__ import absolute_import
 from zerver.lib.actions import get_realm, do_add_realm_filter
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.models import RealmFilter
-import ujson
-
 
 class RealmFilterTest(ZulipTestCase):
 

zerver/tests/test_upload.py

@@ -26,7 +26,6 @@ from zilencer.models import Deployment
 
 from zerver.views.upload import upload_file_backend
 
-import ujson
 from six.moves import urllib
 from PIL import Image