Add Rails 5 support to specs

- Replace silence_stream with ActiveRecord::Migration.suppress_messages
- Resolve rspec-rails changes

spec/controllers/two_factor_authentication_controller_spec.rb

@@ -2,6 +2,14 @@ require 'spec_helper'
 
 describe Devise::TwoFactorAuthenticationController, type: :controller do
   describe 'is_fully_authenticated? helper' do
+    def post_code(code)
+      if Rails::VERSION::MAJOR >= 5
+        post :update, params: { code: code }
+      else
+        post :update, code: code
+      end
+    end
+
     before do
       sign_in
     end
@@ -9,7 +17,7 @@ describe Devise::TwoFactorAuthenticationController, type: :controller do
     context 'after user enters valid OTP code' do
       it 'returns true' do
         controller.current_user.send_new_otp
-        post :update, code: controller.current_user.direct_otp
+        post_code controller.current_user.direct_otp
         expect(subject.is_fully_authenticated?).to eq true
       end
     end
@@ -24,7 +32,7 @@ describe Devise::TwoFactorAuthenticationController, type: :controller do
 
     context 'when user enters an invalid OTP' do
       it 'returns false' do
-        post :update, code: '12345'
+        post_code '12345'
 
         expect(subject.is_fully_authenticated?).to eq false
       end

spec/support/authenticated_model_helper.rb

@@ -29,7 +29,7 @@ module AuthenticatedModelHelper
   end
 
   def create_table_for_nonencrypted_user
-    silence_stream(STDOUT) do
+    ActiveRecord::Migration.suppress_messages do
       ActiveRecord::Schema.define(version: 1) do
         create_table 'users', force: :cascade do |t|
           t.string    'email', default: '', null: false