Make it possible to pass downstream to bridge factory

spec/factories/ci/bridge.rb

@@ -10,8 +10,16 @@ FactoryBot.define do
 
     pipeline factory: :ci_pipeline
 
+    transient { downstream nil }
+
     after(:build) do |bridge, evaluator|
       bridge.project ||= bridge.pipeline.project
+
+      if evaluator.downstream.present?
+        bridge.options = bridge.options.to_h.merge(
+          trigger: { project: evaluator.downstream.full_path }
+        )
+      end
     end
   end
 end