Create an old_relation_member factory, and start using it for tests.

test/factories/old_relation_member.rb

@@ -0,0 +1,9 @@
+FactoryGirl.define do
+  factory :old_relation_member do
+    member_role ""
+
+    old_relation
+    # Default to creating nodes, but could be ways or relations as members
+    association :member, :factory => :node
+  end
+end