Refactor old_relation_controller tests to use factories.

test/factories/relation.rb

@@ -9,5 +9,20 @@ FactoryGirl.define do
     trait :deleted do
       visible false
     end
+
+    trait :with_history do
+      after(:create) do |relation, _evaluator|
+        (1..relation.version).each do |n|
+          create(:old_relation, :relation_id => relation.id, :version => n, :changeset => relation.changeset)
+        end
+
+        # For deleted relations, make sure the most recent old_relation is also deleted.
+        if relation.visible == false
+          latest = relation.old_relations.find_by(:version => relation.version)
+          latest.visible = false
+          latest.save
+        end
+      end
+    end
   end
 end