UPD: dav_registration: tests.

dav_base/tests/generic.py

@@ -4,6 +4,7 @@ from django.apps import apps
 from django.contrib.auth.models import AbstractUser
 from django.contrib.staticfiles.testing import StaticLiveServerTestCase
 from django.core import mail as django_mail
+from django.core.exceptions import ValidationError
 from django.test import SimpleTestCase, TestCase, tag
 from django.urls import reverse
 from selenium import webdriver
@@ -209,6 +210,24 @@ class UrlsTestCase(SimpleTestCase):
                                      'Getting url named \'{}\' resolve to wrong function'.format(url.name))
 
 
+class ValidatorTestMixin(object):
+    def assertValid(self, validator, data):
+        for val in data:
+            try:
+                validator(val)
+            except ValidationError as e:  # pragma: no cover
+                self.fail('%s: %s' % (val, e))
+
+    def assertInvalid(self, validator, data):
+        for val in data:
+            try:
+                validator(val)
+            except ValidationError:
+                pass
+            else:  # pragma: no cover
+                self.fail('%s: no ValidationError was raised' % val)
+
+
 class SeleniumTestCase(StaticLiveServerTestCase):
     headless = True
     window_width = 1024