shared_examples_for "a contractable" do
  it { is_expected.to respond_to(:contract) }
  it { is_expected.to respond_to(:contract_file_name) }

  describe "validations" do
    it { is_expected.to allow_content_type("application/pdf").for(:contract) }
    it { is_expected.not_to allow_content_types("text/plain", "image/png").for(:contract) }
  end
end