[add] added query string support

spec/support/request_spec_helper.rb

@@ -15,6 +15,15 @@ module RequestSpecHelper
     "#{'r' if perm_r}#{'w' if perm_w}#{'x' if perm_x}"
   end
 
+  def hash_to_query_string(hash)
+    result = ''
+    hash.each do |k, v|
+      # escape value to be uri save
+      result += "#{k}=#{CGI.escape(v.to_s)}&"
+    end
+    result.delete_suffix('&')
+  end
+
   def list_equals_db?(client_list)
     return false unless Client.count == client_list.count