diff --git a/Gemfile b/Gemfile
index 4979ec84..039e1d41 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rails', '4.2.0'
+gem 'rails', '4.2.8'
 
 # Bundle edge Rails instead:
 # gem 'rails', :git => 'git://github.com/rails/rails.git'
@@ -63,10 +63,8 @@ group :mysql do
   gem 'mysql2', :require => false
 end
 
-group :postgres do
-  # adapter: postgresql
-  gem 'pg', :require => false
-end
+# adapter: postgresql
+gem 'pg', '~> 0.18', :require => false
 
 group :sqlite do
   # adapter: sqlite3
diff --git a/Gemfile.lock b/Gemfile.lock
index ef12f6a5..8ba710f8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,48 +1,46 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.2.0)
-      actionpack (= 4.2.0)
-      actionview (= 4.2.0)
-      activejob (= 4.2.0)
+    actionmailer (4.2.8)
+      actionpack (= 4.2.8)
+      actionview (= 4.2.8)
+      activejob (= 4.2.8)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-    actionpack (4.2.0)
-      actionview (= 4.2.0)
-      activesupport (= 4.2.0)
-      rack (~> 1.6.0)
+    actionpack (4.2.8)
+      actionview (= 4.2.8)
+      activesupport (= 4.2.8)
+      rack (~> 1.6)
       rack-test (~> 0.6.2)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-      rails-html-sanitizer (~> 1.0, >= 1.0.1)
-    actionview (4.2.0)
-      activesupport (= 4.2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (4.2.8)
+      activesupport (= 4.2.8)
       builder (~> 3.1)
       erubis (~> 2.7.0)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-      rails-html-sanitizer (~> 1.0, >= 1.0.1)
-    activejob (4.2.0)
-      activesupport (= 4.2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (4.2.8)
+      activesupport (= 4.2.8)
       globalid (>= 0.3.0)
-    activemodel (4.2.0)
-      activesupport (= 4.2.0)
+    activemodel (4.2.8)
+      activesupport (= 4.2.8)
       builder (~> 3.1)
-    activerecord (4.2.0)
-      activemodel (= 4.2.0)
-      activesupport (= 4.2.0)
+    activerecord (4.2.8)
+      activemodel (= 4.2.8)
+      activesupport (= 4.2.8)
       arel (~> 6.0)
-    activesupport (4.2.0)
+    activesupport (4.2.8)
       i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.3.8)
-    arel (6.0.0)
-    bcrypt (3.1.10)
-    binding_of_caller (0.7.2)
-      debug_inspector (>= 0.0.1)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    arel (6.0.4)
+    bcrypt (3.1.12)
     bluecloth (2.2.0)
-    builder (3.2.2)
+    builder (3.2.3)
     cancan (1.6.10)
     capybara (2.2.1)
       mime-types (>= 1.16)
@@ -50,141 +48,151 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (~> 2.0)
-    capybara-screenshot (1.0.9)
-      capybara (>= 1.0, < 3)
+    capybara-screenshot (1.0.21)
+      capybara (>= 1.0, < 4)
       launchy
     capybara-webkit (1.3.1)
       capybara (>= 2.0.2, < 2.5.0)
       json
-    celluloid (0.16.0)
-      timers (~> 4.0.0)
-    coderay (1.1.0)
-    coffee-rails (4.1.0)
+    coderay (1.1.2)
+    coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
-      railties (>= 4.0.0, < 5.0)
+      railties (>= 4.0.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.9.1.1)
+    coffee-script-source (1.12.2)
+    concurrent-ruby (1.0.5)
+    crass (1.0.4)
     css3buttons (1.0.1)
       actionpack (>= 3.0.0)
-    database_cleaner (1.4.1)
-    debug_inspector (0.0.2)
-    default_value_for (3.0.1)
-      activerecord (>= 3.2.0, < 5.0)
-    devise (3.4.1)
+    database_cleaner (1.7.0)
+    debug_inspector (0.0.3)
+    default_value_for (3.1.0)
+      activerecord (>= 3.2.0, < 6.0)
+    devise (4.4.3)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
-      railties (>= 3.2.6, < 5)
+      railties (>= 4.1.0, < 6.0)
       responders
-      thread_safe (~> 0.1)
       warden (~> 1.2.3)
-    diff-lcs (1.2.5)
+    diff-lcs (1.3)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
-    eventmachine (1.0.7)
-    execjs (2.5.2)
-    factory_girl (4.5.0)
+    eventmachine (1.2.7)
+    execjs (2.7.0)
+    factory_girl (4.9.0)
       activesupport (>= 3.0.0)
-    factory_girl_rails (4.5.0)
-      factory_girl (~> 4.5.0)
+    factory_girl_rails (4.9.0)
+      factory_girl (~> 4.9.0)
       railties (>= 3.0.0)
-    ffi (1.9.8)
+    ffi (1.9.25)
     formatador (0.2.5)
-    globalid (0.3.5)
-      activesupport (>= 4.1.0)
-    guard (2.12.5)
+    globalid (0.4.1)
+      activesupport (>= 4.2.0)
+    guard (2.14.2)
       formatador (>= 0.2.4)
-      listen (~> 2.7)
-      lumberjack (~> 1.0)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
       nenv (~> 0.1)
       notiffany (~> 0.0)
       pry (>= 0.9.12)
       shellany (~> 0.0)
       thor (>= 0.18.1)
-    guard-livereload (2.4.0)
+    guard-compat (1.2.1)
+    guard-livereload (2.5.2)
       em-websocket (~> 0.5)
       guard (~> 2.8)
+      guard-compat (~> 1.0)
       multi_json (~> 1.8)
-    hitimes (1.2.2)
     http_parser.rb (0.6.0)
-    i18n (0.7.0)
-    jquery-rails (4.0.3)
-      rails-dom-testing (~> 1.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    its-it (1.3.0)
+    jquery-rails (4.3.3)
+      rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.2)
+    json (2.1.0)
+    key_struct (0.4.2)
     launchy (2.4.3)
       addressable (~> 2.3)
-    listen (2.10.0)
-      celluloid (~> 0.16.0)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    loofah (2.0.1)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    loofah (2.2.2)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    lumberjack (1.0.9)
-    mail (2.6.3)
-      mime-types (>= 1.16, < 3)
-    method_source (0.8.2)
-    mime-types (2.4.3)
-    mini_portile (0.6.2)
-    minitest (5.6.0)
-    multi_json (1.11.0)
-    mysql2 (0.3.18)
-    nenv (0.2.0)
-    nokogiri (1.6.6.2)
-      mini_portile (~> 0.6.0)
-    notiffany (0.0.6)
+    lumberjack (1.0.13)
+    mail (2.7.0)
+      mini_mime (>= 0.1.1)
+    method_source (0.9.0)
+    mime-types (3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2016.0521)
+    mini_mime (1.0.0)
+    mini_portile2 (2.3.0)
+    minitest (5.11.3)
+    modware (0.1.3)
+      key_struct (~> 0.4)
+    multi_json (1.13.1)
+    mysql2 (0.5.2)
+    nenv (0.3.0)
+    nokogiri (1.8.4)
+      mini_portile2 (~> 2.3.0)
+    notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
     orm_adapter (0.5.0)
-    pg (0.18.1)
-    protected_attributes (1.0.9)
+    pg (1.0.0)
+    protected_attributes (1.1.4)
       activemodel (>= 4.0.1, < 5.0)
-    pry (0.10.1)
+    pry (0.11.3)
       coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    rack (1.6.0)
+      method_source (~> 0.9.0)
+    public_suffix (3.0.2)
+    rack (1.6.10)
     rack-test (0.6.3)
       rack (>= 1.0)
-    rails (4.2.0)
-      actionmailer (= 4.2.0)
-      actionpack (= 4.2.0)
-      actionview (= 4.2.0)
-      activejob (= 4.2.0)
-      activemodel (= 4.2.0)
-      activerecord (= 4.2.0)
-      activesupport (= 4.2.0)
+    rails (4.2.8)
+      actionmailer (= 4.2.8)
+      actionpack (= 4.2.8)
+      actionview (= 4.2.8)
+      activejob (= 4.2.8)
+      activemodel (= 4.2.8)
+      activerecord (= 4.2.8)
+      activesupport (= 4.2.8)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.2.0)
+      railties (= 4.2.8)
       sprockets-rails
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.6)
-      activesupport (>= 4.2.0.beta, < 5.0)
-      nokogiri (~> 1.6.0)
+    rails-dom-testing (1.0.9)
+      activesupport (>= 4.2.0, < 5.0)
+      nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
-    rails-html-sanitizer (1.0.2)
-      loofah (~> 2.0)
-    railties (4.2.0)
-      actionpack (= 4.2.0)
-      activesupport (= 4.2.0)
+    rails-html-sanitizer (1.0.4)
+      loofah (~> 2.2, >= 2.2.2)
+    railties (4.2.8)
+      actionpack (= 4.2.8)
+      activesupport (= 4.2.8)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rake (10.4.2)
-    rb-fsevent (0.9.4)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    responders (2.1.0)
-      railties (>= 4.2.0, < 5)
+    rake (12.3.1)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    responders (2.4.0)
+      actionpack (>= 4.2.0, < 5.3)
+      railties (>= 4.2.0, < 5.3)
     rspec (3.0.0)
       rspec-core (~> 3.0.0)
       rspec-expectations (~> 3.0.0)
       rspec-mocks (~> 3.0.0)
-    rspec-activemodel-mocks (1.0.1)
+    rspec-activemodel-mocks (1.0.3)
       activemodel (>= 3.0)
       activesupport (>= 3.0)
       rspec-mocks (>= 2.99, < 4.0)
@@ -204,47 +212,111 @@ GEM
       rspec-mocks (~> 3.0.0)
       rspec-support (~> 3.0.0)
     rspec-support (3.0.4)
-    sass (3.4.13)
-    sass-rails (5.0.3)
-      railties (>= 4.0.0, < 5.0)
+    ruby_dep (1.5.0)
+    sass (3.5.6)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (5.0.7)
+      railties (>= 4.0.0, < 6)
       sass (~> 3.1)
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
-      tilt (~> 1.1)
-    schema_plus (1.8.8)
-      activerecord (>= 3.2, <= 4.2.0)
+      tilt (>= 1.1, < 3)
+    schema_auto_foreign_keys (0.1.3)
+      its-it (~> 1.2)
+      schema_plus_foreign_keys (~> 0.1)
+      schema_plus_indexes (~> 0.2)
+    schema_monkey (2.1.5)
+      activerecord (>= 4.2)
+      modware (~> 0.1)
+    schema_plus (2.0.1)
+      activerecord (~> 4.2)
+      schema_auto_foreign_keys (~> 0.1)
+      schema_monkey (~> 2.1)
+      schema_plus_columns (~> 0.1)
+      schema_plus_core (~> 1.0)
+      schema_plus_db_default (~> 0.1)
+      schema_plus_default_expr (~> 0.1)
+      schema_plus_enums (~> 0.1)
+      schema_plus_foreign_keys (~> 0.1)
+      schema_plus_indexes (~> 0.1, >= 0.1.3)
+      schema_plus_pg_indexes (~> 0.1, >= 0.1.3)
+      schema_plus_tables (~> 0.1)
+      schema_plus_views (~> 0.1)
+    schema_plus_columns (0.3.0)
+      activerecord (>= 4.2, < 5.3)
+      its-it (~> 1.2)
+      schema_plus_core
+      schema_plus_indexes (~> 0.2)
+    schema_plus_compatibility (0.4.0)
+      activerecord (>= 4.2, < 5.3)
+      schema_monkey (~> 2.1)
+    schema_plus_core (1.0.2)
+      activerecord (~> 4.2)
+      its-it (~> 1.2)
+      schema_monkey (~> 2.1)
+    schema_plus_db_default (0.1.1)
+      activerecord (~> 4.2)
+      schema_plus_core (~> 1.0)
+    schema_plus_default_expr (0.1.4)
+      activerecord (>= 4.2, < 6.0)
+      its-it (~> 1.2)
+      schema_plus_core (>= 1.0, < 3.0)
+    schema_plus_enums (0.1.7)
+      activerecord (>= 4.2, < 5.2)
+      its-it (~> 1.2)
+      schema_plus_core
+    schema_plus_foreign_keys (0.1.7)
+      activerecord (>= 4.2, < 5.1)
+      its-it (~> 1.2)
+      schema_plus_compatibility (~> 0.2)
+      schema_plus_core
       valuable
+    schema_plus_indexes (0.3.0)
+      activerecord (>= 4.2, < 5.2)
+      its-it (~> 1.2)
+      schema_plus_core
+    schema_plus_pg_indexes (0.1.12)
+      activerecord (~> 4.2)
+      its-it (~> 1.2)
+      schema_plus_core (~> 1.0)
+      schema_plus_indexes (~> 0.1, >= 0.1.3)
+    schema_plus_tables (0.1.1)
+      activerecord (~> 4.2)
+      schema_plus_core (~> 1.0)
+    schema_plus_views (0.3.1)
+      activerecord (~> 4.2)
+      schema_plus_core (~> 1.0)
     shellany (0.0.1)
-    slop (3.6.0)
     spork (0.9.0.rc9)
-    spring (1.3.4)
-    sprockets (3.0.1)
-      rack (~> 1.0)
-    sprockets-rails (2.2.4)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      sprockets (>= 2.8, < 4.0)
-    sqlite3 (1.3.10)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tilt (1.4.1)
-    timers (4.0.1)
-      hitimes
-    tzinfo (1.2.2)
+    spring (2.0.2)
+      activesupport (>= 4.2)
+    sprockets (3.7.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    sqlite3 (1.3.13)
+    thor (0.20.0)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (2.7.1)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
-    valuable (0.9.9)
-    warden (1.2.3)
+    uglifier (4.1.14)
+      execjs (>= 0.3.0, < 3)
+    valuable (0.9.14)
+    warden (1.2.7)
       rack (>= 1.0)
-    web-console (2.1.2)
-      activemodel (>= 4.0)
-      binding_of_caller (>= 0.7.2)
-      railties (>= 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-    will_paginate (3.0.7)
-    xpath (2.0.0)
+    web-console (3.3.0)
+      activemodel (>= 4.2)
+      debug_inspector
+      railties (>= 4.2)
+    will_paginate (3.1.6)
+    xpath (2.1.0)
       nokogiri (~> 1.3)
 
 PLATFORMS
@@ -272,7 +344,7 @@ DEPENDENCIES
   protected_attributes
   pry
   rack
-  rails (= 4.2.0)
+  rails (= 4.2.8)
   rspec
   rspec-activemodel-mocks
   rspec-rails (~> 3.0.0)
@@ -284,3 +356,6 @@ DEPENDENCIES
   uglifier
   web-console
   will_paginate
+
+BUNDLED WITH
+   1.16.0
diff --git a/app/controllers/admin/comments_controller.rb b/app/controllers/admin/comments_controller.rb
index bb3a1aec..5556646e 100644
--- a/app/controllers/admin/comments_controller.rb
+++ b/app/controllers/admin/comments_controller.rb
@@ -23,7 +23,7 @@ def edit
   def update
     @comment = Comment.find(params[:id])
     authorize! :update, @comment
-    if @comment.update_attributes(params[:comment], :as => current_user.role)
+    if @comment.update_attributes(comment_params)
       redirect_back(admin_comments_path)
     else
       render :action => 'edit'
@@ -82,6 +82,12 @@ def import
   end
 
 private
+  def comment_params
+    params.require(:comment).permit(
+      :author_name, :author_email, :content
+    )
+  end
+
   def set_navigation_ids
     @navigation_ids = [:dashboard, :comments]
   end
diff --git a/app/controllers/admin/topics_controller.rb b/app/controllers/admin/topics_controller.rb
index 02ec8e00..7a99e88c 100644
--- a/app/controllers/admin/topics_controller.rb
+++ b/app/controllers/admin/topics_controller.rb
@@ -5,13 +5,16 @@ class Admin::TopicsController < ApplicationController
   before_filter :set_navigation_ids
 
   def show
-    show! do
-      @comments = @topic.comments.page(params[:page])
+    @comments = @topic.comments.page(params[:page])
+    respond_to do |format|
+      format.json { render json: @topic.to_json }
+      format.html
     end
   end
 
   def destroy
-    destroy! { admin_site_path(@topic.site) }
+    @topic.destroy
+    redirect_to admin_site_path(@topic.site)
   end
 
   def index
diff --git a/app/models/topic.rb b/app/models/topic.rb
index 4f2ee561..d406cee1 100644
--- a/app/models/topic.rb
+++ b/app/models/topic.rb
@@ -44,6 +44,10 @@ def self.alt_key(topic_key)
     topic_key.match(/\/$/) ? topic_key.chop : "#{topic_key}/"
   end
 
+  def to_json
+    {:comments => {count: comments.count}}
+  end
+
 private
   def self.find_by_site_key_and_topic_key(site_key, topic_key)
     Topic.
diff --git a/app/views/admin/comments/_comment.html.erb b/app/views/admin/comments/_comment.html.erb
index 5de5c49f..1e2a1041 100644
--- a/app/views/admin/comments/_comment.html.erb
+++ b/app/views/admin/comments/_comment.html.erb
@@ -3,7 +3,7 @@
   <div class="shell">
     <div class="metadata">
       <div class="avatar">
-  		  <img src="//www.gravatar.com/avatar/<%= comment.author_email_md5 %>?s=64"
+  		  <img src="//www.gravatar.com/avatar/<%= comment.author_email_md5 %>?s=64&d=identicon"
   		  width="64"
   		  height="64"
   		  alt="<%= comment.author_name || 'Anonymous' %>">
diff --git a/app/views/api/_comment.html.erb b/app/views/api/_comment.html.erb
index 5f2fb692..85e16d86 100644
--- a/app/views/api/_comment.html.erb
+++ b/app/views/api/_comment.html.erb
@@ -2,14 +2,14 @@
 	<div class="juvia-metadata">
 		<% if comment.author_email %>
 			<div class="juvia-avatar">
-				<img src="//www.gravatar.com/avatar/<%= comment.author_email_md5 %>?s=64"
+				<img src="//www.gravatar.com/avatar/<%= comment.author_email_md5 %>?s=64&d=identicon"
 				width="64"
 				height="64"
 				alt="<%= comment.author_name || 'Anonymous' %>">
 			</div>
 		<% else %>
 			<div class="juvia-avatar">
-				<img src="//www.gravatar.com/avatar/generic?s=64"
+				<img src="http://www.gravatar.com/avatar/generic?s=64&d=identicon"
 				width="64"
 				height="64"
 				alt="<%= comment.author_name || 'Anonymous' %>">
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 79214056..9279965e 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -23,6 +23,8 @@
   # (comment out if your front-end server doesn't support this)
   config.action_dispatch.x_sendfile_header = "X-Sendfile" # Use 'X-Accel-Redirect' for nginx
 
+  config.log_level = :debug
+
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
   # config.force_ssl = true
 
diff --git a/db/seeds.rb b/db/seeds.rb
index 7c6be43f..f42adc3b 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -27,9 +27,9 @@
     :referer => 'http://www.google.com')
 else
   User.create!({
-    :email => 'admin@localhost',
-    :password => 'admin',
-    :password_confirmation => 'admin',
+    :email => 'admin@localhost.com',
+    :password => 'adminadmin',
+    :password_confirmation => 'adminadmin',
     :admin => true
   }, :as => :admin)
 end
diff --git a/spec/controllers/admin/topics_controller_spec.rb b/spec/controllers/admin/topics_controller_spec.rb
new file mode 100644
index 00000000..faab6b39
--- /dev/null
+++ b/spec/controllers/admin/topics_controller_spec.rb
@@ -0,0 +1,126 @@
+require File.expand_path(File.dirname(__FILE__) + "/../../spec_helper")
+
+describe Admin::TopicsController, type: :controller do
+  let(:valid_attributes) { FactoryGirl.attributes_for(:topic) }
+
+  before do
+    @site = FactoryGirl.create(:site1, :user => kotori)
+    @topic = FactoryGirl.create(:topic, site: @site)
+  end
+
+  describe "GET index" do
+    def visit_normally
+      get :index
+    end
+
+    include_examples "requires authentication"
+  end
+
+  describe "GET show" do
+    def visit_normally
+      get :show, :id => @topic.id
+    end
+
+    include_examples "requires authentication"
+  end
+
+  describe "GET edit" do
+    def visit_normally
+      get :edit, :id => @topic.id
+    end
+
+    include_examples "requires authentication"
+  end
+
+  describe "POST create" do
+    def visit_normally
+      post :create, :topic => valid_attributes
+    end
+
+    include_examples "requires authentication"
+  end
+
+  describe "PUT update" do
+    def visit_normally
+      put :update, :id => @topic.id, :topic => valid_attributes
+    end
+
+    include_examples "requires authentication"
+  end
+
+  describe "DELETE destroy" do
+    def visit_normally
+      delete :destroy, :id => @topic.id
+    end
+
+    include_examples "requires authentication"
+  end
+end
+
+describe Admin::TopicsController, type: :controller do
+  render_views
+
+  before do
+    sign_in(admin)
+    @site = FactoryGirl.create(:site1, :user => kotori)
+    @topic = FactoryGirl.create(:topic, site: @site)
+  end
+
+  let(:valid_attributes) { FactoryGirl.attributes_for(:topic) }
+
+  describe "GET show" do
+    def visit_normally
+      get :show, :id => @topic.id
+    end
+
+    it "assigns the requested topic as @topic" do
+      visit_normally
+      expect(assigns(:topic)).to eq(@topic)
+      expect(assigns(:comments)).to eq(@topic.comments)
+    end
+
+    context "as json" do
+      let(:json_response) { ActiveSupport::JSON.decode(response.body) }
+
+      it "assigns the @topic and @comments" do
+        get :show, :id => @topic.id, format: :json
+
+        expect(assigns(:topic)).to eq(@topic)
+        expect(assigns(:comments)).to eq(@topic.comments)
+      end
+
+      it "returns valid JSON response" do
+        get :show, :id => @topic.id, format: :json
+
+        expect(json_response['comments']).not_to be_nil
+        expect(json_response['comments']['count']).to eq(@topic.comments.count)
+      end
+    end
+  end
+
+  describe "GET new" do
+    it "raises error" do
+      expect { get :new}.to raise_error
+    end
+  end
+
+  describe "GET edit" do
+    it "raises error" do
+      expect { get :edit}.to raise_error
+    end
+  end
+
+  describe "DELETE destroy" do
+    it "destroys the requested topic" do
+      expect {
+        delete :destroy, :id => @topic.id
+      }.to change(Topic, :count).by(-1)
+    end
+
+    it "redirects to the site path" do
+      delete :destroy, :id => @topic.id
+      expect(response).to redirect_to(admin_site_path(@topic.site))
+    end
+  end
+
+end