tests: improved test utils.

- better assert errors
- allow owner to be set consistently

rhodecode/tests/plugin.py

@@ -1170,11 +1170,14 b' class UserUtility(object):'
         user_group = self.create_user_group(members=[user])
         return user, user_group
 
-    def create_user_group(self, members=None, auto_cleanup=True, **kwargs):
+    def create_user_group(self, owner=TEST_USER_ADMIN_LOGIN, members=None,
+                          auto_cleanup=True, **kwargs):
         group_name = "{prefix}_usergroup_{count}".format(
             prefix=self._test_name,
             count=len(self.user_group_ids))
-        user_group = self.fixture.create_user_group(group_name, **kwargs)
+        user_group = self.fixture.create_user_group(
+            group_name, cur_user=owner, **kwargs)
+
         if auto_cleanup:
             self.user_group_ids.append(user_group.users_group_id)
         if members:

rhodecode/tests/utils.py

@@ -241,14 +241,14 b' class AssertResponse(object):'
         doc = fromstring(self.response.body)
         sel = CSSSelector('#' + anchor_id)
         elements = sel(doc)
-        assert len(elements) == 1
+        assert len(elements) == 1, 'cannot find 1 element {}'.format(anchor_id)
 
     def _ensure_url_equal(self, found, expected):
         assert _Url(found) == _Url(expected)
 
     def get_element(self, css_selector):
         elements = self._get_elements(css_selector)
-        assert len(elements) == 1
+        assert len(elements) == 1, 'cannot find 1 element {}'.format(css_selector)
         return elements[0]
 
     def get_elements(self, css_selector):