add booth_request factory

spec/factories/booth_request.rb

@@ -0,0 +1,8 @@
+FactoryGirl.define do
+  factory :booth_request do
+    booth
+    user
+    role 'responsible'
+
+  end
+end

spec/factories/booths.rb

@@ -9,7 +9,8 @@ FactoryGirl.define do
     conference
 
     after(:build) do |booth|
-      booth.responsibles << create(:user)
+      booth.responsibles << create(:booth_request).user
     end
+
   end
 end