Check out notification after deliting other comment, user subscribes to topic and suitable with checked 'Auto Subscribe'

Pre-condition:

1. User1 and User2 are registered and logged in
2. At least one branch is created
3. User1 has checked "Auto subscribe" checkbox in the profile
4. User1 has permissions CREATE_POSTS, VIEW_POSTS
5. User2 has permissions DELETE_OTHERS_POSTS, VIEW_POSTS
6. User3 has permissions CREATE_POSTS, VIEW_POSTS
7. User3 created a topic.