authenticate search controller test requests

test/controllers/v1/search_controller_test.rb

+require 'test_helper'
+
 class V1::SearchControllerTest < ActionController::TestCase
+  tests V1::SearchController
 
   setup do
     LearningObject.reindex
     LearningObject.searchkick_index.refresh
+    auth_application
   end
 
   test 'should get index and return :ok' do