added unit testing for controllers/posts.rb
added unit testing for controllers/posts.rb

Signed-off-by: Holloway, Kean Ho <bbd8faa40b0f348214bf4124b281a301299ba6dd@gmail.com>

hollowaykeanho/craigslist,hollowaykeanho/craigslist,hollowaykeanho/craigslist