describe "associations" do
  context "when accidentally using an implicit delcaration for the factory" do
    it "raises an error about the trait not being registered" do
      define_class("Post")

      FactoryBot.define do
        factory :post do
          author factory: user
        end
      end

      expect { FactoryBot.build(:post) }.
        to raise_error(KeyError, "Trait not registered: \"user\"")
    end
  end
end