Fix and test for delete user (#1713)

* Fix and test for delete user

* Run updates in batches

* Unit test

models/fixtures/follow.yml

@@ -2,3 +2,13 @@
   id: 1
   user_id: 4
   follow_id: 2
+
+-
+  id: 2
+  user_id: 8
+  follow_id: 2
+
+-
+  id: 3
+  user_id: 2
+  follow_id: 8

models/fixtures/user.yml

@@ -4,9 +4,9 @@
   name: user1
   full_name: User One
   email: user1@example.com
-  passwd: password
+  passwd: 7d93daa0d1e6f2305cc8fa496847d61dc7320bb16262f9c55dd753480207234cdd96a93194e408341971742f4701772a025a # password
   type: 0 # individual
-  salt: salt
+  salt: ZogKvWdyEx
   is_admin: true
   avatar: avatar1
   avatar_email: user1@example.com
@@ -26,7 +26,8 @@
   avatar_email: user2@example.com
   num_repos: 2
   num_stars: 2
-  num_followers: 1
+  num_followers: 2
+  num_following: 1
   is_active: true
 
 -
@@ -123,6 +124,8 @@
   avatar_email: user8@example.com
   num_repos: 0
   is_active: true
+  num_followers: 1
+  num_following: 1
 
 -
   id: 9