+ relation = create(:relation, :with_history, :version => 4)
+ relation_v1 = relation.old_relations.find_by(:version => 1)
+ relation_v1.redact!(create(:redaction))
+ relation_v3 = relation.old_relations.find_by(:version => 3)
+ relation_v3.redact!(create(:redaction))
+
+ get :relation_history, :id => relation.id