Add link to password change form in admin

See merge request !95

arkindex/users/admin.py

@@ -39,7 +39,7 @@ class UserChangeForm(forms.ModelForm):
     the user, but replaces the password field with admin's
     password hash display field.
     """
-    password = ReadOnlyPasswordHashField()
+    password = ReadOnlyPasswordHashField(help_text='<a href="../password/">Change password</a>')
 
     class Meta:
         model = User

arkindex/users/tests/test_providers.py

+from arkindex.users import providers
+from arkindex.users.providers import get_provider
+from django.test import TestCase
+
+
+class TestProviders(TestCase):
+
+    def test_get_provider(self):
+
+        class SomeProvider(object):
+            pass
+
+        providers.oauth_providers = [SomeProvider]
+        self.assertEqual(get_provider('SomeProvider'), SomeProvider)
+        self.assertIsNone(get_provider('doesnotexist'))