diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -111,7 +111,6 @@
 
   def authorization
     return false unless authenticate
-    puts "haha 1"
     user = User.find(session[:user_id])
     unless user.roles.detect { |role|
         role.rights.detect{ |right|
@@ -119,7 +118,6 @@
             (right.action == 'all' or right.action == action_name)
         }
       }
-      puts "haha 2"
       flash[:notice] = 'You are not authorized to view the page you requested'
       #request.env['HTTP_REFERER'] ? (redirect_to :back) : (redirect_to :controller => 'login')
       redirect_to :controller => 'main', :action => 'login'
diff --git a/app/views/main/_login_box.html.haml b/app/views/main/_login_box.html.haml
--- a/app/views/main/_login_box.html.haml
+++ b/app/views/main/_login_box.html.haml
@@ -6,11 +6,9 @@
   %br/
   %br/
 
-  - puts flash.inspect
   - if flash[:notice]
     %hr/
     %b= flash[:notice]
-    %b= haha
     %hr/
 
   %div{ :style => "border: solid 1px gray; padding: 4px; background: #eeeeff;"}
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -14,201 +14,190 @@
 ActiveRecord::Schema.define(version: 20170124024527) do
 
   create_table "announcements", force: :cascade do |t|
-    t.string   "author",       limit: 255
-    t.text     "body",         limit: 65535
+    t.string   "author"
+    t.text     "body"
     t.boolean  "published"
-    t.datetime "created_at",                                 null: false
-    t.datetime "updated_at",                                 null: false
-    t.boolean  "frontpage",                  default: false
-    t.boolean  "contest_only",               default: false
-    t.string   "title",        limit: 255
-    t.string   "notes",        limit: 255
+    t.datetime "created_at",                   null: false
+    t.datetime "updated_at",                   null: false
+    t.boolean  "frontpage",    default: false
+    t.boolean  "contest_only", default: false
+    t.string   "title"
+    t.string   "notes"
   end
 
   create_table "contests", force: :cascade do |t|
-    t.string   "title",      limit: 255
+    t.string   "title"
     t.boolean  "enabled"
-    t.datetime "created_at",             null: false
-    t.datetime "updated_at",             null: false
-    t.string   "name",       limit: 255
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string   "name"
   end
 
   create_table "contests_problems", id: false, force: :cascade do |t|
-    t.integer "contest_id", limit: 4
-    t.integer "problem_id", limit: 4
+    t.integer "contest_id"
+    t.integer "problem_id"
   end
 
   create_table "contests_users", id: false, force: :cascade do |t|
-    t.integer "contest_id", limit: 4
-    t.integer "user_id",    limit: 4
+    t.integer "contest_id"
+    t.integer "user_id"
   end
 
   create_table "countries", force: :cascade do |t|
-    t.string   "name",       limit: 255
-    t.datetime "created_at",             null: false
-    t.datetime "updated_at",             null: false
+    t.string   "name"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
   create_table "descriptions", force: :cascade do |t|
-    t.text     "body",       limit: 65535
+    t.text     "body"
     t.boolean  "markdowned"
-    t.datetime "created_at",               null: false
-    t.datetime "updated_at",               null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
   create_table "grader_configurations", force: :cascade do |t|
-    t.string   "key",         limit: 255
-    t.string   "value_type",  limit: 255
-    t.string   "value",       limit: 255
-    t.datetime "created_at",                null: false
-    t.datetime "updated_at",                null: false
-    t.text     "description", limit: 65535
+    t.string   "key"
+    t.string   "value_type"
+    t.string   "value"
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+    t.text     "description"
   end
 
   create_table "grader_processes", force: :cascade do |t|
-    t.string   "host",       limit: 255
-    t.integer  "pid",        limit: 4
-    t.string   "mode",       limit: 255
+    t.string   "host"
+    t.integer  "pid"
+    t.string   "mode"
     t.boolean  "active"
-    t.datetime "created_at",             null: false
-    t.datetime "updated_at",             null: false
-    t.integer  "task_id",    limit: 4
-    t.string   "task_type",  limit: 255
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer  "task_id"
+    t.string   "task_type"
     t.boolean  "terminated"
   end
 
-  add_index "grader_processes", ["host", "pid"], name: "index_grader_processes_on_ip_and_pid", using: :btree
+  add_index "grader_processes", ["host", "pid"], name: "index_grader_processes_on_ip_and_pid"
 
   create_table "heart_beats", force: :cascade do |t|
-    t.integer  "user_id",    limit: 4
-    t.string   "ip_address", limit: 255
-    t.datetime "created_at",             null: false
-    t.datetime "updated_at",             null: false
-    t.string   "status",     limit: 255
+    t.integer  "user_id"
+    t.string   "ip_address"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string   "status"
   end
 
-  add_index "heart_beats", ["updated_at"], name: "index_heart_beats_on_updated_at", using: :btree
+  add_index "heart_beats", ["updated_at"], name: "index_heart_beats_on_updated_at"
 
   create_table "languages", force: :cascade do |t|
     t.string "name",        limit: 10
-    t.string "pretty_name", limit: 255
+    t.string "pretty_name"
     t.string "ext",         limit: 10
-    t.string "common_ext",  limit: 255
+    t.string "common_ext"
   end
 
   create_table "logins", force: :cascade do |t|
-    t.integer  "user_id",    limit: 4
-    t.string   "ip_address", limit: 255
-    t.datetime "created_at",             null: false
-    t.datetime "updated_at",             null: false
+    t.integer  "user_id"
+    t.string   "ip_address"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
   create_table "messages", force: :cascade do |t|
-    t.integer  "sender_id",           limit: 4
-    t.integer  "receiver_id",         limit: 4
-    t.integer  "replying_message_id", limit: 4
-    t.text     "body",                limit: 65535
+    t.integer  "sender_id"
+    t.integer  "receiver_id"
+    t.integer  "replying_message_id"
+    t.text     "body"
     t.boolean  "replied"
-    t.datetime "created_at",                        null: false
-    t.datetime "updated_at",                        null: false
+    t.datetime "created_at",          null: false
+    t.datetime "updated_at",          null: false
   end
 
-  create_table "problems", force: :cascade do |t|
-    t.string  "name",                 limit: 30
-    t.string  "full_name",            limit: 255
-    t.integer "full_score",           limit: 4
-    t.date    "date_added"
-    t.boolean "available"
-    t.string  "url",                  limit: 255
-    t.integer "description_id",       limit: 4
-    t.boolean "test_allowed"
-    t.boolean "output_only"
-    t.string  "description_filename", limit: 255
-    t.boolean "view_testcase"
-  end
+# Could not dump table "problems" because of following NoMethodError
+#   undefined method `[]' for nil:NilClass
 
   create_table "rights", force: :cascade do |t|
-    t.string "name",       limit: 255
-    t.string "controller", limit: 255
-    t.string "action",     limit: 255
+    t.string "name"
+    t.string "controller"
+    t.string "action"
   end
 
   create_table "rights_roles", id: false, force: :cascade do |t|
-    t.integer "right_id", limit: 4
-    t.integer "role_id",  limit: 4
+    t.integer "right_id"
+    t.integer "role_id"
   end
 
-  add_index "rights_roles", ["role_id"], name: "index_rights_roles_on_role_id", using: :btree
+  add_index "rights_roles", ["role_id"], name: "index_rights_roles_on_role_id"
 
   create_table "roles", force: :cascade do |t|
-    t.string "name", limit: 255
+    t.string "name"
   end
 
   create_table "roles_users", id: false, force: :cascade do |t|
-    t.integer "role_id", limit: 4
-    t.integer "user_id", limit: 4
+    t.integer "role_id"
+    t.integer "user_id"
   end
 
-  add_index "roles_users", ["user_id"], name: "index_roles_users_on_user_id", using: :btree
+  add_index "roles_users", ["user_id"], name: "index_roles_users_on_user_id"
 
   create_table "sessions", force: :cascade do |t|
-    t.string   "session_id", limit: 255
-    t.text     "data",       limit: 65535
+    t.string   "session_id"
+    t.text     "data"
     t.datetime "updated_at"
   end
 
-  add_index "sessions", ["session_id"], name: "index_sessions_on_session_id", using: :btree
-  add_index "sessions", ["updated_at"], name: "index_sessions_on_updated_at", using: :btree
+  add_index "sessions", ["session_id"], name: "index_sessions_on_session_id"
+  add_index "sessions", ["updated_at"], name: "index_sessions_on_updated_at"
 
   create_table "sites", force: :cascade do |t|
-    t.string   "name",       limit: 255
+    t.string   "name"
     t.boolean  "started"
     t.datetime "start_time"
-    t.datetime "created_at",             null: false
-    t.datetime "updated_at",             null: false
-    t.integer  "country_id", limit: 4
-    t.string   "password",   limit: 255
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer  "country_id"
+    t.string   "password"
   end
 
   create_table "submission_view_logs", force: :cascade do |t|
-    t.integer  "user_id",       limit: 4
-    t.integer  "submission_id", limit: 4
-    t.datetime "created_at",              null: false
-    t.datetime "updated_at",              null: false
+    t.integer  "user_id"
+    t.integer  "submission_id"
+    t.datetime "created_at",    null: false
+    t.datetime "updated_at",    null: false
   end
 
   create_table "submissions", force: :cascade do |t|
-    t.integer  "user_id",               limit: 4
-    t.integer  "problem_id",            limit: 4
-    t.integer  "language_id",           limit: 4
-    t.text     "source",                limit: 65535
-    t.binary   "binary",                limit: 65535
+    t.integer  "user_id"
+    t.integer  "problem_id"
+    t.integer  "language_id"
+    t.text     "source"
+    t.binary   "binary"
     t.datetime "submitted_at"
     t.datetime "compiled_at"
-    t.text     "compiler_message",      limit: 65535
+    t.text     "compiler_message"
     t.datetime "graded_at"
-    t.integer  "points",                limit: 4
-    t.text     "grader_comment",        limit: 65535
-    t.integer  "number",                limit: 4
-    t.string   "source_filename",       limit: 255
-    t.float    "max_runtime",           limit: 24
-    t.integer  "peak_memory",           limit: 4
-    t.integer  "effective_code_length", limit: 4
-    t.string   "ip_address",            limit: 255
+    t.integer  "points"
+    t.text     "grader_comment"
+    t.integer  "number"
+    t.string   "source_filename"
+    t.float    "max_runtime"
+    t.integer  "peak_memory"
+    t.integer  "effective_code_length"
+    t.string   "ip_address"
   end
 
-  add_index "submissions", ["user_id", "problem_id", "number"], name: "index_submissions_on_user_id_and_problem_id_and_number", unique: true, using: :btree
-  add_index "submissions", ["user_id", "problem_id"], name: "index_submissions_on_user_id_and_problem_id", using: :btree
+  add_index "submissions", ["user_id", "problem_id", "number"], name: "index_submissions_on_user_id_and_problem_id_and_number", unique: true
+  add_index "submissions", ["user_id", "problem_id"], name: "index_submissions_on_user_id_and_problem_id"
 
   create_table "tasks", force: :cascade do |t|
-    t.integer  "submission_id", limit: 4
+    t.integer  "submission_id"
     t.datetime "created_at"
-    t.integer  "status",        limit: 4
+    t.integer  "status"
     t.datetime "updated_at"
   end
 
   create_table "test_pairs", force: :cascade do |t|
-    t.integer  "problem_id", limit: 4
+    t.integer  "problem_id"
     t.text     "input",      limit: 16777215
     t.text     "solution",   limit: 16777215
     t.datetime "created_at",                  null: false
@@ -216,66 +205,66 @@
   end
 
   create_table "test_requests", force: :cascade do |t|
-    t.integer  "user_id",          limit: 4
-    t.integer  "problem_id",       limit: 4
-    t.integer  "submission_id",    limit: 4
-    t.string   "input_file_name",  limit: 255
-    t.string   "output_file_name", limit: 255
-    t.string   "running_stat",     limit: 255
-    t.integer  "status",           limit: 4
-    t.datetime "updated_at",                     null: false
+    t.integer  "user_id"
+    t.integer  "problem_id"
+    t.integer  "submission_id"
+    t.string   "input_file_name"
+    t.string   "output_file_name"
+    t.string   "running_stat"
+    t.integer  "status"
+    t.datetime "updated_at",       null: false
     t.datetime "submitted_at"
     t.datetime "compiled_at"
-    t.text     "compiler_message", limit: 65535
+    t.text     "compiler_message"
     t.datetime "graded_at"
-    t.string   "grader_comment",   limit: 255
-    t.datetime "created_at",                     null: false
-    t.float    "running_time",     limit: 24
-    t.string   "exit_status",      limit: 255
-    t.integer  "memory_usage",     limit: 4
+    t.string   "grader_comment"
+    t.datetime "created_at",       null: false
+    t.float    "running_time"
+    t.string   "exit_status"
+    t.integer  "memory_usage"
   end
 
-  add_index "test_requests", ["user_id", "problem_id"], name: "index_test_requests_on_user_id_and_problem_id", using: :btree
+  add_index "test_requests", ["user_id", "problem_id"], name: "index_test_requests_on_user_id_and_problem_id"
 
   create_table "testcases", force: :cascade do |t|
-    t.integer  "problem_id", limit: 4
-    t.integer  "num",        limit: 4
-    t.integer  "group",      limit: 4
-    t.integer  "score",      limit: 4
+    t.integer  "problem_id"
+    t.integer  "num"
+    t.integer  "group"
+    t.integer  "score"
     t.text     "input",      limit: 4294967295
     t.text     "sol",        limit: 4294967295
-    t.datetime "created_at"
-    t.datetime "updated_at"
+    t.datetime "created_at",                    null: false
+    t.datetime "updated_at",                    null: false
   end
 
-  add_index "testcases", ["problem_id"], name: "index_testcases_on_problem_id", using: :btree
+  add_index "testcases", ["problem_id"], name: "index_testcases_on_problem_id"
 
   create_table "user_contest_stats", force: :cascade do |t|
-    t.integer  "user_id",       limit: 4
+    t.integer  "user_id"
     t.datetime "started_at"
-    t.datetime "created_at",              null: false
-    t.datetime "updated_at",              null: false
+    t.datetime "created_at",    null: false
+    t.datetime "updated_at",    null: false
     t.boolean  "forced_logout"
   end
 
   create_table "users", force: :cascade do |t|
     t.string   "login",           limit: 50
-    t.string   "full_name",       limit: 255
-    t.string   "hashed_password", limit: 255
+    t.string   "full_name"
+    t.string   "hashed_password"
     t.string   "salt",            limit: 5
-    t.string   "alias",           limit: 255
-    t.string   "email",           limit: 255
-    t.integer  "site_id",         limit: 4
-    t.integer  "country_id",      limit: 4
-    t.boolean  "activated",                   default: false
+    t.string   "alias"
+    t.string   "email"
+    t.integer  "site_id"
+    t.integer  "country_id"
+    t.boolean  "activated",                  default: false
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "enabled",                     default: true
-    t.string   "remark",          limit: 255
-    t.string   "last_ip",         limit: 255
-    t.string   "section",         limit: 255
+    t.boolean  "enabled",                    default: true
+    t.string   "remark"
+    t.string   "last_ip"
+    t.string   "section"
   end
 
-  add_index "users", ["login"], name: "index_users_on_login", unique: true, using: :btree
+  add_index "users", ["login"], name: "index_users_on_login", unique: true
 
 end
diff --git a/test/controllers/announcements_controller_test.rb b/test/controllers/announcements_controller_test.rb
new file mode 100644
--- /dev/null
+++ b/test/controllers/announcements_controller_test.rb
@@ -0,0 +1,50 @@
+require 'test_helper'
+
+class AnnouncementsControllerTest < ActionController::TestCase
+  setup do
+    @announcement = announcements(:one)
+    @request.session[:user_id] = users(:admin).id
+  end
+
+  test "should get index" do
+    get :index
+    assert_response :success
+    assert_not_nil assigns(:announcements)
+  end
+
+  test "should get new" do
+    get :new
+    assert_response :success
+  end
+
+  test "should create announcement" do
+    assert_difference('Announcement.count') do
+      post :create, announcement: {  author: 'test', body: 'haha', published: true}
+    end
+
+    assert_redirected_to announcement_path(assigns(:announcement))
+  end
+
+  test "should show announcement" do
+    get :show, id: @announcement
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get :edit, id: @announcement
+    assert_response :success
+  end
+
+  test "should update announcement" do
+    patch :update, id: @announcement, announcement: { body: 'another body' }
+    assert_redirected_to announcement_path(assigns(:announcement))
+  end
+
+  test "should destroy announcement" do
+    assert_difference('Announcement.count', -1) do
+      delete :destroy, id: @announcement
+    end
+
+    assert_redirected_to announcements_path
+  end
+end
diff --git a/test/integration/admin_task_test.rb b/test/integration/admin_task_test.rb
new file mode 100644
--- /dev/null
+++ b/test/integration/admin_task_test.rb
@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class AdminTaskTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,11 +2,18 @@
 require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'
 
-#reporter
+#reporter for beautiful result
 require "minitest/reporters"
 Minitest::Reporters.use!
 
+module SignInHelper
+  def sign_in_as(user,password)
+    post login_login_path, {login: user, password: password }
+  end
+end
+
 class ActiveSupport::TestCase
+  include SignInHelper
   # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
   #
   # Note: You'll currently still have to declare fixtures explicitly in integration tests