Silence Python 3 deprecation warnings

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/tests/test_utils.py

@@ -22,6 +22,8 @@ from unittest import TestCase
 
 from django.core.exceptions import ImproperlyConfigured
 
+from six import assertRaisesRegex
+
 from weblate.trans.util import load_class
 
 
@@ -31,7 +33,7 @@ class LoadClassTest(TestCase):
         self.assertEqual(cls, TestCase)
 
     def test_invalid_name(self):
-        self.assertRaisesRegexp(
+        assertRaisesRegex(
             ImproperlyConfigured,
             'Error importing class unittest in TEST: .*"'
             '(not enough|need more than)',
@@ -39,7 +41,7 @@ class LoadClassTest(TestCase):
         )
 
     def test_invalid_module(self):
-        self.assertRaisesRegexp(
+        assertRaisesRegex(
             ImproperlyConfigured,
             'weblate.trans.tests.missing in TEST: "'
             'No module named .*missing["\']',
@@ -47,7 +49,7 @@ class LoadClassTest(TestCase):
         )
 
     def test_invalid_class(self):
-        self.assertRaisesRegexp(
+        assertRaisesRegex(
             ImproperlyConfigured,
             '"weblate.trans.tests.test_utils" does not define a "Foo" class',
             load_class, 'weblate.trans.tests.test_utils.Foo', 'TEST'