Add artifacts trait to build factory in specs

spec/factories/ci/builds.rb

@@ -54,7 +54,7 @@ FactoryGirl.define do
     end
 
     factory :ci_build_with_trace do
-      after(:create) do  |build, evaluator|
+      after(:create) do |build, evaluator|
         build.trace = 'BUILD TRACE'
       end
     end