diff --git a/Gemfile b/Gemfile
--- a/Gemfile
+++ b/Gemfile
@@ -1,15 +1,20 @@
 source 'https://rubygems.org'
 
+#rails
 gem 'rails', '~>4.2.0'
 gem 'activerecord-session_store'
 
-gem 'select2-rails'
 
 # Bundle edge Rails instead:
 # gem 'rails', :git => 'git://github.com/rails/rails.git'
 
+#---------------- database ---------------------
+#the database
 gem 'mysql2'
+#for testing
 gem 'sqlite3'
+#for dumping database into yaml
+gem 'yaml_db'
 
 # Gems used only for assets and not required
 # in production environments by default.
@@ -21,7 +26,8 @@
 
 gem 'uglifier'
 
-
+gem 'haml'
+gem 'haml-rails'
 # gem 'prototype-rails'
 
 # To use ActiveModel has_secure_password
@@ -63,16 +69,20 @@
 gem 'momentjs-rails'
 gem 'rails_bootstrap_sortable'
 
+#----------- user interface -----------------
+#select 2
+gem 'select2-rails'
 #ace editor
 gem 'ace-rails-ap'
+#paginator
+gem 'will_paginate', '~> 3.0.7'
 
-gem 'haml'
-gem 'haml-rails'
 gem 'mail'
 gem 'rdiscount'
-gem 'test-unit'
-gem 'will_paginate', '~> 3.0.7'
 gem 'dynamic_form'
 gem 'in_place_editing'
 gem 'verification', :git => 'https://github.com/sikachu/verification.git'
 
+
+#---------------- testiing -----------------------
+gem 'minitest-reporters'
diff --git a/Gemfile.lock b/Gemfile.lock
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -51,6 +51,7 @@
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
+    ansi (1.5.0)
     arel (6.0.4)
     autoprefixer-rails (6.6.0)
       execjs
@@ -111,13 +112,17 @@
     mime-types-data (3.2016.0521)
     mini_portile2 (2.1.0)
     minitest (5.10.1)
+    minitest-reporters (1.1.13)
+      ansi
+      builder
+      minitest (>= 5.0)
+      ruby-progressbar
     momentjs-rails (2.15.1)
       railties (>= 3.1)
     multi_json (1.12.1)
     mysql2 (0.4.5)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-    power_assert (0.4.1)
     rack (1.6.5)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -150,6 +155,7 @@
     rake (12.0.0)
     rdiscount (2.2.0.1)
     rouge (2.0.7)
+    ruby-progressbar (1.8.1)
     ruby_parser (3.8.3)
       sexp_processor (~> 4.1)
     sass (3.4.23)
@@ -170,8 +176,6 @@
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
     sqlite3 (1.3.12)
-    test-unit (3.2.3)
-      power_assert
     thor (0.19.4)
     thread_safe (0.3.5)
     tilt (2.0.5)
@@ -180,6 +184,9 @@
     uglifier (3.0.4)
       execjs (>= 0.3.0, < 3)
     will_paginate (3.0.12)
+    yaml_db (0.4.2)
+      rails (>= 3.0, < 5.1)
+      rake (>= 0.8.7)
 
 PLATFORMS
   ruby
@@ -203,6 +210,7 @@
   jquery-timepicker-addon-rails
   jquery-ui-rails
   mail
+  minitest-reporters
   momentjs-rails
   mysql2
   rails (~> 4.2.0)
@@ -212,10 +220,10 @@
   sass-rails
   select2-rails
   sqlite3
-  test-unit
   uglifier
   verification!
   will_paginate (~> 3.0.7)
+  yaml_db
 
 BUNDLED WITH
    1.13.6
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
@@ -1,7 +1,7 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery
 
-  before_filter :current_user 
+  before_filter :current_user
 
   SINGLE_USER_MODE_CONF_KEY = 'system.single_user_mode'
   MULTIPLE_IP_LOGIN_CONF_KEY = 'right.multiple_ip_login'
@@ -37,6 +37,15 @@
     end
   end
 
+  def testcase_authorization
+    #admin always has privileged
+    if @current_user.admin?
+      return true
+    end
+
+    unauthorized_redirect if GraderConfiguration["right.view_testcase"]
+  end
+
   protected
 
   def authenticate
diff --git a/app/controllers/problems_controller.rb b/app/controllers/problems_controller.rb
--- a/app/controllers/problems_controller.rb
+++ b/app/controllers/problems_controller.rb
@@ -1,6 +1,7 @@
 class ProblemsController < ApplicationController
 
-  before_filter :authenticate, :authorization
+  before_action :authenticate, :authorization
+  before_action :testcase_authorization, only: [:show_testcase]
 
   in_place_edit_for :problem, :name
   in_place_edit_for :problem, :full_name
@@ -221,6 +222,10 @@
     redirect_to :action => 'manage'
   end
 
+  def show_testcase
+    @problem = Problem.includes(:testcases).find(params[:id])
+  end
+
   ##################################
   protected
 
diff --git a/app/controllers/testcases_controller.rb b/app/controllers/testcases_controller.rb
new file mode 100644
--- /dev/null
+++ b/app/controllers/testcases_controller.rb
@@ -0,0 +1,24 @@
+class TestcasesController < ApplicationController
+  before_action :set_testcase, only: [:download_input,:download_sol]
+  before_action :testcase_authorization
+
+  def download_input
+    send_data @testcase.input, type: 'text/plain', filename: "#{@testcase.problem.name}.#{@testcase.num}.in"
+  end
+
+  def download_sol
+    send_data @testcase.sol, type: 'text/plain', filename: "#{@testcase.problem.name}.#{@testcase.num}.sol"
+  end
+
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_testcase
+      @testcase = Testcase.find(params[:id])
+    end
+
+    # Only allow a trusted parameter "white list" through.
+    def testcase_params
+      params[:testcase]
+    end
+end
diff --git a/app/helpers/testcases_helper.rb b/app/helpers/testcases_helper.rb
new file mode 100644
--- /dev/null
+++ b/app/helpers/testcases_helper.rb
@@ -0,0 +1,2 @@
+module TestcasesHelper
+end
diff --git a/app/models/grader_configuration.rb b/app/models/grader_configuration.rb
--- a/app/models/grader_configuration.rb
+++ b/app/models/grader_configuration.rb
@@ -10,6 +10,8 @@
   MULTICONTESTS_KEY = 'system.multicontests'
   CONTEST_TIME_LIMIT_KEY = 'contest.time_limit'
   MULTIPLE_IP_LOGIN_KEY = 'right.multiple_ip_login'
+  VIEW_TESTCASE = 'right.view_testcase'
+  SINGLE_USER_KEY = 'system.single_user_mode'
 
   cattr_accessor :config_cache
   cattr_accessor :task_grading_info_cache
@@ -70,6 +72,10 @@
     return (get(SYSTEM_MODE_CONF_KEY)=='analysis')
   end
 
+  def  self.show_testcase
+    return get(VIEW_TESTCASE)
+  end
+
   def self.allow_test_request(user)
     mode = get(SYSTEM_MODE_CONF_KEY)
     early_timeout = get(TEST_REQUEST_EARLY_TIMEOUT_KEY)
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
@@ -12,7 +12,7 @@
     %hr/
 
   %div{ :style => "border: solid 1px gray; padding: 4px; background: #eeeeff;"}
-    = form_tag :controller => 'login', :action => 'login' do
+    = form_tag login_login_path do
       %table
         %tr
           %td{:align => "right"} 
diff --git a/app/views/main/_submission_short.html.haml b/app/views/main/_submission_short.html.haml
--- a/app/views/main/_submission_short.html.haml
+++ b/app/views/main/_submission_short.html.haml
@@ -24,4 +24,6 @@
     = link_to "#{t 'main.cmp_msg'}", compiler_msg_submission_path(submission.id), {popup: true,remote: true,class: 'btn btn-xs btn-info'}
   = link_to "#{t 'main.src_link'}",{:action => 'source', :id => submission.id}, class: 'btn btn-xs btn-info'
   = link_to "#{t 'main.submissions_link'}", problem_submissions_path(problem_id), class: 'btn btn-xs btn-info'
+  - if GraderConfiguration.show_testcase
+    = link_to "testcases", show_testcase_problem_path(problem_id), class: 'btn btn-xs btn-info'
 
diff --git a/app/views/main/list.html.haml b/app/views/main/list.html.haml
--- a/app/views/main/list.html.haml
+++ b/app/views/main/list.html.haml
@@ -50,3 +50,14 @@
   = "Announcement.refreshUrl = '#{url_for :controller => 'main', :action => 'announcements'}';"
   Announcement.registerRefreshEventTimer();
 
+.modal.fade#compiler{tabindex: -1,role: 'dialog'}
+  .modal-dialog.modal-lg{role:'document'}
+    .modal-content
+      .modal-header
+        %button.close{type: 'button', data: {dismissed: :modal}, aria: {label: 'close'}}
+          %span{aria: {hidden: 'true'}, data: {dismiss: 'modal'}} &times;
+        %h4 Compiler message
+      .modal-body
+        %pre#compiler_msg
+      .modal-footer
+        %button.btn.btn-default{type: 'button', data: {dismiss: 'modal'}} Close
diff --git a/app/views/problems/show_testcase.html.haml b/app/views/problems/show_testcase.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/problems/show_testcase.html.haml
@@ -0,0 +1,25 @@
+%h1 Test cases
+%h2= @problem.long_name
+
+/navbar
+%ul.nav.nav-pills{role: :tablist}
+  - @problem.testcases.each.with_index do |tc,id|
+    %li{role: :presentation, class: ('active' if id == 0)}
+      %a{href:"#tc#{tc.id}", role: 'tab', data: {toggle: 'tab'}}= tc.num
+
+/actual data
+.tab-content
+  - @problem.testcases.each.with_index do |tc,id|
+    .tab-pane{id: "tc#{tc.id}",class: ('active' if id == 0)}
+      .row
+        .col-md-6
+          %h3 Input
+          = link_to "Download",download_input_problem_testcase_path(@problem,tc),class: 'btn btn-info btn-sm'
+        .col-md-6
+          %h3 Output
+          = link_to "Download",download_sol_problem_testcase_path(@problem,tc),class: 'btn btn-info btn-sm'
+      .row
+        .col-md-6
+          %textarea{ rows: 25,readonly: true,style: "width:100%;resize=none;overflow-y: scroll;"}= tc.input
+        .col-md-6
+          %textarea{ rows: 25,readonly: true,style: "width:100%;resize=none;overflow-y: scroll;"}= tc.sol
diff --git a/app/views/submissions/compiler_msg.js.haml b/app/views/submissions/compiler_msg.js.haml
--- a/app/views/submissions/compiler_msg.js.haml
+++ b/app/views/submissions/compiler_msg.js.haml
@@ -1,3 +1,4 @@
-:javascript
-  $("#compiler_msg").html("#{j @submissionhcompiler_msg}")
-  
+:plain
+  $("#compiler_msg").html("#{j @submission.compiler_message}");
+  $("#compiler").modal();
+
diff --git a/app/views/submissions/get_latest_submission_status.js.haml b/app/views/submissions/get_latest_submission_status.js.haml
--- a/app/views/submissions/get_latest_submission_status.js.haml
+++ b/app/views/submissions/get_latest_submission_status.js.haml
@@ -1,2 +1,2 @@
-:javascript
+:plain
   $("#latest_status").html("#{j render({partial: 'submission_short', locals: {submission: @submission, problem_name: @problem.name}})}")
diff --git a/config/routes.rb b/config/routes.rb
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -3,6 +3,9 @@
 
   root :to => 'main#login'
 
+  #logins
+  get 'login/login',  to: 'login#login'
+
   resources :contests
 
   resources :sites
@@ -18,6 +21,7 @@
       get 'toggle'
       get 'toggle_test'
       get 'stat'
+      get 'show_testcase'
     end
     collection do
       get 'turn_all_off'
@@ -25,6 +29,13 @@
       get 'import'
       get 'manage'
     end
+
+    resources :testcases, only: [] do
+      member do
+        get 'download_input'
+        get 'download_sol'
+      end
+    end
   end
 
   resources :grader_configuration, controller: 'configurations'
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -14,200 +14,200 @@
 ActiveRecord::Schema.define(version: 20161031063337) do
 
   create_table "announcements", force: :cascade do |t|
-    t.string   "author"
-    t.text     "body"
+    t.string   "author",       limit: 255
+    t.text     "body",         limit: 65535
     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"
-    t.string   "notes"
+    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
   end
 
   create_table "contests", force: :cascade do |t|
-    t.string   "title"
+    t.string   "title",      limit: 255
     t.boolean  "enabled"
-    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
+    t.string   "name",       limit: 255
   end
 
   create_table "contests_problems", id: false, force: :cascade do |t|
-    t.integer "contest_id"
-    t.integer "problem_id"
+    t.integer "contest_id", limit: 4
+    t.integer "problem_id", limit: 4
   end
 
   create_table "contests_users", id: false, force: :cascade do |t|
-    t.integer "contest_id"
-    t.integer "user_id"
+    t.integer "contest_id", limit: 4
+    t.integer "user_id",    limit: 4
   end
 
   create_table "countries", force: :cascade do |t|
-    t.string   "name"
-    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
   end
 
   create_table "descriptions", force: :cascade do |t|
-    t.text     "body"
+    t.text     "body",       limit: 65535
     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"
-    t.string   "value_type"
-    t.string   "value"
-    t.datetime "created_at",  null: false
-    t.datetime "updated_at",  null: false
-    t.text     "description"
+    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
   end
 
   create_table "grader_processes", force: :cascade do |t|
-    t.string   "host"
-    t.integer  "pid"
-    t.string   "mode"
+    t.string   "host",       limit: 255
+    t.integer  "pid",        limit: 4
+    t.string   "mode",       limit: 255
     t.boolean  "active"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.integer  "task_id"
-    t.string   "task_type"
+    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.boolean  "terminated"
   end
 
-  add_index "grader_processes", ["host", "pid"], name: "index_grader_processes_on_ip_and_pid"
+  add_index "grader_processes", ["host", "pid"], name: "index_grader_processes_on_ip_and_pid", using: :btree
 
   create_table "heart_beats", force: :cascade do |t|
-    t.integer  "user_id"
-    t.string   "ip_address"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.string   "status"
+    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
   end
 
-  add_index "heart_beats", ["updated_at"], name: "index_heart_beats_on_updated_at"
+  add_index "heart_beats", ["updated_at"], name: "index_heart_beats_on_updated_at", using: :btree
 
   create_table "languages", force: :cascade do |t|
     t.string "name",        limit: 10
-    t.string "pretty_name"
+    t.string "pretty_name", limit: 255
     t.string "ext",         limit: 10
-    t.string "common_ext"
+    t.string "common_ext",  limit: 255
   end
 
   create_table "logins", force: :cascade do |t|
-    t.integer  "user_id"
-    t.string   "ip_address"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.integer  "user_id",    limit: 4
+    t.string   "ip_address", limit: 255
+    t.datetime "created_at",             null: false
+    t.datetime "updated_at",             null: false
   end
 
   create_table "messages", force: :cascade do |t|
-    t.integer  "sender_id"
-    t.integer  "receiver_id"
-    t.integer  "replying_message_id"
-    t.text     "body"
+    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.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"
-    t.integer "full_score"
+    t.string  "full_name",            limit: 255
+    t.integer "full_score",           limit: 4
     t.date    "date_added"
     t.boolean "available"
-    t.string  "url"
-    t.integer "description_id"
+    t.string  "url",                  limit: 255
+    t.integer "description_id",       limit: 4
     t.boolean "test_allowed"
     t.boolean "output_only"
-    t.string  "description_filename"
+    t.string  "description_filename", limit: 255
   end
 
   create_table "rights", force: :cascade do |t|
-    t.string "name"
-    t.string "controller"
-    t.string "action"
+    t.string "name",       limit: 255
+    t.string "controller", limit: 255
+    t.string "action",     limit: 255
   end
 
   create_table "rights_roles", id: false, force: :cascade do |t|
-    t.integer "right_id"
-    t.integer "role_id"
+    t.integer "right_id", limit: 4
+    t.integer "role_id",  limit: 4
   end
 
-  add_index "rights_roles", ["role_id"], name: "index_rights_roles_on_role_id"
+  add_index "rights_roles", ["role_id"], name: "index_rights_roles_on_role_id", using: :btree
 
   create_table "roles", force: :cascade do |t|
-    t.string "name"
+    t.string "name", limit: 255
   end
 
   create_table "roles_users", id: false, force: :cascade do |t|
-    t.integer "role_id"
-    t.integer "user_id"
+    t.integer "role_id", limit: 4
+    t.integer "user_id", limit: 4
   end
 
-  add_index "roles_users", ["user_id"], name: "index_roles_users_on_user_id"
+  add_index "roles_users", ["user_id"], name: "index_roles_users_on_user_id", using: :btree
 
   create_table "sessions", force: :cascade do |t|
-    t.string   "session_id"
-    t.text     "data"
+    t.string   "session_id", limit: 255
+    t.text     "data",       limit: 65535
     t.datetime "updated_at"
   end
 
-  add_index "sessions", ["session_id"], name: "index_sessions_on_session_id"
-  add_index "sessions", ["updated_at"], name: "index_sessions_on_updated_at"
+  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
 
   create_table "sites", force: :cascade do |t|
-    t.string   "name"
+    t.string   "name",       limit: 255
     t.boolean  "started"
     t.datetime "start_time"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.integer  "country_id"
-    t.string   "password"
+    t.datetime "created_at",             null: false
+    t.datetime "updated_at",             null: false
+    t.integer  "country_id", limit: 4
+    t.string   "password",   limit: 255
   end
 
   create_table "submission_view_logs", force: :cascade do |t|
-    t.integer  "user_id"
-    t.integer  "submission_id"
-    t.datetime "created_at",    null: false
-    t.datetime "updated_at",    null: false
+    t.integer  "user_id",       limit: 4
+    t.integer  "submission_id", limit: 4
+    t.datetime "created_at",              null: false
+    t.datetime "updated_at",              null: false
   end
 
   create_table "submissions", force: :cascade do |t|
-    t.integer  "user_id"
-    t.integer  "problem_id"
-    t.integer  "language_id"
-    t.text     "source"
-    t.binary   "binary"
+    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.datetime "submitted_at"
     t.datetime "compiled_at"
-    t.text     "compiler_message"
+    t.text     "compiler_message",      limit: 65535
     t.datetime "graded_at"
-    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"
+    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
   end
 
-  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"
+  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
 
   create_table "tasks", force: :cascade do |t|
-    t.integer  "submission_id"
+    t.integer  "submission_id", limit: 4
     t.datetime "created_at"
-    t.integer  "status"
+    t.integer  "status",        limit: 4
     t.datetime "updated_at"
   end
 
   create_table "test_pairs", force: :cascade do |t|
-    t.integer  "problem_id"
+    t.integer  "problem_id", limit: 4
     t.text     "input",      limit: 16777215
     t.text     "solution",   limit: 16777215
     t.datetime "created_at",                  null: false
@@ -215,66 +215,66 @@
   end
 
   create_table "test_requests", force: :cascade do |t|
-    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.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.datetime "submitted_at"
     t.datetime "compiled_at"
-    t.text     "compiler_message"
+    t.text     "compiler_message", limit: 65535
     t.datetime "graded_at"
-    t.string   "grader_comment"
-    t.datetime "created_at",       null: false
-    t.float    "running_time"
-    t.string   "exit_status"
-    t.integer  "memory_usage"
+    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
   end
 
-  add_index "test_requests", ["user_id", "problem_id"], name: "index_test_requests_on_user_id_and_problem_id"
+  add_index "test_requests", ["user_id", "problem_id"], name: "index_test_requests_on_user_id_and_problem_id", using: :btree
 
   create_table "testcases", force: :cascade do |t|
-    t.integer  "problem_id"
-    t.integer  "num"
-    t.integer  "group"
-    t.integer  "score"
-    t.text     "input"
-    t.text     "sol"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.integer  "problem_id", limit: 4
+    t.integer  "num",        limit: 4
+    t.integer  "group",      limit: 4
+    t.integer  "score",      limit: 4
+    t.text     "input",      limit: 65535
+    t.text     "sol",        limit: 65535
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
-  add_index "testcases", ["problem_id"], name: "index_testcases_on_problem_id"
+  add_index "testcases", ["problem_id"], name: "index_testcases_on_problem_id", using: :btree
 
   create_table "user_contest_stats", force: :cascade do |t|
-    t.integer  "user_id"
+    t.integer  "user_id",       limit: 4
     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"
-    t.string   "hashed_password"
+    t.string   "full_name",       limit: 255
+    t.string   "hashed_password", limit: 255
     t.string   "salt",            limit: 5
-    t.string   "alias"
-    t.string   "email"
-    t.integer  "site_id"
-    t.integer  "country_id"
-    t.boolean  "activated",                  default: false
+    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.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "enabled",                    default: true
-    t.string   "remark"
-    t.string   "last_ip"
-    t.string   "section"
+    t.boolean  "enabled",                     default: true
+    t.string   "remark",          limit: 255
+    t.string   "last_ip",         limit: 255
+    t.string   "section",         limit: 255
   end
 
-  add_index "users", ["login"], name: "index_users_on_login", unique: true
+  add_index "users", ["login"], name: "index_users_on_login", unique: true, using: :btree
 
 end
diff --git a/db/seeds.rb b/db/seeds.rb
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -89,6 +89,12 @@
      :description => 'Heart beat response text'
    },
 
+   {
+     :key => 'right.view_testcase',
+     :value_type => 'boolean',
+     :default_value => 'false',
+     :description => 'When true, any user can view/download test data'
+   },
    # If Configuration['system.online_registration'] is true, the
    # system allows online registration, and will use these
    # information for sending confirmation emails.
diff --git a/lib/grader_script.rb b/lib/grader_script.rb
--- a/lib/grader_script.rb
+++ b/lib/grader_script.rb
@@ -49,10 +49,25 @@
       output = `#{cmd}`
 
       Dir.chdir(cur_dir)
-      
+
       return "import CMD: #{cmd}\n" + output
     end
     return ''
   end
 
+  def self.call_import_testcase(problem_name)
+    if GraderScript.grader_control_enabled?
+      cur_dir = `pwd`.chomp
+      Dir.chdir(GRADER_ROOT_DIR)
+
+      script_name = File.join(GRADER_ROOT_DIR, "scripts/load_testcase")
+      cmd = "#{script_name} #{problem_name}"
+
+      output = `#{cmd}`
+
+      Dir.chdir(cur_dir)
+      return "Testcase import result:\n" + output
+    end
+  end
+
 end
diff --git a/lib/tasks/fixtures.rake b/lib/tasks/fixtures.rake
new file mode 100644
--- /dev/null
+++ b/lib/tasks/fixtures.rake
@@ -0,0 +1,41 @@
+# Original from http://snippets.dzone.com/posts/show/4468 by MichaelBoutros
+#
+# Optimized version which uses to_yaml for content creation and checks
+# that models are ActiveRecord::Base models before trying to fetch
+# them from database.
+namespace :db do
+  namespace :fixtures do
+    desc 'Dumps all models into fixtures.'
+    task :dump => :environment do
+      puts "rails root = #{Rails.root}"
+      models = Dir.glob(Rails.root.to_s + '/app/models/**.rb').map do |s|
+        Pathname.new(s).basename.to_s.gsub(/\.rb$/,'').camelize
+      end
+
+      puts "Found models: " + models.join(', ')
+
+      models.each do |m|
+        model = m.constantize
+        next unless model.ancestors.include?(ActiveRecord::Base)
+
+        puts "Dumping model: " + m
+        entries = model.all.order(id: :asc)
+
+        increment = 1
+
+        model_file = Rails.root.to_s + '/test/fixtures2/' + m.underscore.pluralize + '.yml'
+        File.open(model_file, 'w') do |f|
+          entries.each do |a|
+            attrs = a.attributes
+            attrs.delete_if{|k,v| v.blank?}
+
+            output = {m + '_' + increment.to_s => attrs}
+            f << output.to_yaml.gsub(/^--- \n/,'') + "\n"
+
+            increment += 1
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/testdata_importer.rb b/lib/testdata_importer.rb
--- a/lib/testdata_importer.rb
+++ b/lib/testdata_importer.rb
@@ -38,6 +38,9 @@
     @log_msg << import_problem_pdf(dirname)
     @log_msg << import_full_score(dirname)
 
+    #import test data
+    @log_msg << GraderScript.call_import_testcase(@problem.name)
+
     return true
   end
 
diff --git a/test/controllers/testcases_controller_test.rb b/test/controllers/testcases_controller_test.rb
new file mode 100644
--- /dev/null
+++ b/test/controllers/testcases_controller_test.rb
@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class TestcasesControllerTest < ActionController::TestCase
+  setup do
+    @testcase = testcases(:one)
+  end
+end
diff --git a/test/fixtures/grader_configurations.yml b/test/fixtures/grader_configurations.yml
new file mode 100644
--- /dev/null
+++ b/test/fixtures/grader_configurations.yml
@@ -0,0 +1,144 @@
+GraderConfiguration_1:
+  key: system.single_user_mode
+  value_type: boolean
+  value: 'false'
+  description: Only admins can log in to the system when running under single user mode.
+
+GraderConfiguration_2:
+  key: ui.front.title
+  value_type: string
+  value: Grader
+
+GraderConfiguration_3:
+  key: ui.front.welcome_message
+  value_type: string
+  value: Welcome!
+
+GraderConfiguration_4:
+  key: ui.show_score
+  value_type: boolean
+  value: 'true'
+
+GraderConfiguration_5:
+  key: contest.time_limit
+  value_type: string
+  value: unlimited
+  description: Time limit in format hh:mm, or "unlimited" for contests with no time
+    limits.  This config is CACHED.  Restart the server before the change can take
+    effect.
+
+GraderConfiguration_6:
+  key: system.mode
+  value_type: string
+  value: standard
+  description: Current modes are "standard", "contest", "indv-contest", and "analysis".
+
+
+GraderConfiguration_7:
+  key: contest.name
+  value_type: string
+  value: Grader
+  description: This name will be shown on the user header bar.
+
+
+GraderConfiguration_8:
+  key: contest.multisites
+  value_type: boolean
+  value: 'false'
+  description: If the server is in contest mode and this option is true, on the log
+    in of the admin a menu for site selections is shown.
+
+
+GraderConfiguration_9:
+  key: right.user_hall_of_fame
+  value_type: boolean
+  value: 'false'
+  description: If true, any user can access hall of fame page.
+
+
+GraderConfiguration_10:
+  key: right.multiple_ip_login
+  value_type: boolean
+  value: 'true'
+  description: When change from true to false, a user can login from the first IP
+    they logged into afterward.
+
+
+GraderConfiguration_11:
+  key: right.user_view_submission
+  value_type: boolean
+  value: 'false'
+  description: If true, any user can view submissions of every one.
+
+
+GraderConfiguration_12:
+  key: right.bypass_agreement
+  value_type: boolean
+  value: 'true'
+  description: When false, a user must accept usage agreement before login
+
+
+GraderConfiguration_13:
+  key: right.heartbeat_response
+  value_type: string
+  value: OK
+  description: Heart beat response text
+
+
+GraderConfiguration_14:
+  key: right.view_testcase
+  value_type: boolean
+  value: 'false'
+  description: When true, any user can view/download test data
+
+
+GraderConfiguration_15:
+  key: system.online_registration.smtp
+  value_type: string
+  value: smtp.somehost.com
+
+
+GraderConfiguration_16:
+  key: system.online_registration.from
+  value_type: string
+  value: your.email@address
+
+
+GraderConfiguration_17:
+  key: system.admin_email
+  value_type: string
+  value: admin@admin.email
+
+
+GraderConfiguration_18:
+  key: system.user_setting_enabled
+  value_type: boolean
+  value: 'true'
+  description: If this option is true, users can change their settings
+
+
+GraderConfiguration_19:
+  key: contest.test_request.early_timeout
+  value_type: boolean
+  value: 'false'
+
+
+GraderConfiguration_20:
+  key: system.multicontests
+  value_type: boolean
+  value: 'false'
+
+
+GraderConfiguration_21:
+  key: contest.confirm_indv_contest_start
+  value_type: boolean
+  value: 'false'
+
+
+GraderConfiguration_22:
+  key: contest.default_contest_name
+  value_type: string
+  value: none
+  description: New user will be assigned to this contest automatically, if it exists.  Set
+    to 'none' if there is no default contest.
+
diff --git a/test/fixtures/languages.yml b/test/fixtures/languages.yml
--- a/test/fixtures/languages.yml
+++ b/test/fixtures/languages.yml
@@ -1,5 +1,36 @@
-# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
-one:
-  id: 1
-two:
-  id: 2
+Language_1:
+  name: c
+  pretty_name: C
+  ext: c
+  common_ext: c
+
+Language_2:
+  name: cpp
+  pretty_name: C++
+  ext: cpp
+  common_ext: cpp,cc
+
+Language_3:
+  name: pas
+  pretty_name: Pascal
+  ext: pas
+  common_ext: pas
+
+Language_4:
+  name: ruby
+  pretty_name: Ruby
+  ext: rb
+  common_ext: rb
+
+Language_5:
+  name: python
+  pretty_name: Python
+  ext: py
+  common_ext: py
+
+Language_6:
+  name: java
+  pretty_name: Java
+  ext: java
+  common_ext: java
+
diff --git a/test/fixtures/users.yml b/test/fixtures/users.yml
--- a/test/fixtures/users.yml
+++ b/test/fixtures/users.yml
@@ -13,10 +13,10 @@
   salt: <%= salt %>
   activated: true
 
-mary:
-  login: mary
-  full_name: mary
-  hashed_password: <%= User.encrypt("goodbye",salt) %>
+admin:
+  login: admin
+  full_name: admin
+  hashed_password: <%= User.encrypt("admin",salt) %>
   salt: <%= salt %>
   roles: admin
   activated: true
diff --git a/test/integration/login_test.rb b/test/integration/login_test.rb
--- a/test/integration/login_test.rb
+++ b/test/integration/login_test.rb
@@ -5,9 +5,36 @@
   #   assert true
   # end
 
-  test "login with valid information" do
+  test "login with invalid information" do
+    get root_path
+    assert_response :success
+    post login_login_path, login: "root", password: "hahaha"
+    assert_redirected_to root_path
+  end
+
+  test "normal user login" do
     get root_path
     assert_response :success
+    post login_login_path, {login: "john", password: "hello" }
+    assert_redirected_to main_list_path
+  end
 
+  test "normal user login in single_user mode" do
+    GraderConfiguration.find_by(key: GraderConfiguration::SINGLE_USER_KEY).update_attributes(value: 'true')
+    GraderConfiguration.reload
+    get root_path
+    assert_response :success
+    post login_login_path, {login: "john", password: "hello" }
+    follow_redirect!
+    assert_redirected_to root_path
+  end
+
+  test "root login in in single_user mode" do
+    GraderConfiguration.find_by(key: GraderConfiguration::SINGLE_USER_KEY).update_attributes(value: 'true')
+    GraderConfiguration.reload
+    get root_path
+    assert_response :success
+    post login_login_path, {login: "admin", password: "admin" }
+    assert_redirected_to main_list_path
   end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,6 +2,10 @@
 require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'
 
+#reporter
+require "minitest/reporters"
+Minitest::Reporters.use!
+
 class ActiveSupport::TestCase
   # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
   #