sure/test/controllers/settings/payments_controller_test.rb

require "test_helper"

class Settings::PaymentsControllerTest < ActionDispatch::IntegrationTest
  setup do
    sign_in @user = users(:empty)
    @family = @user.family
  end

  test "returns forbidden when family has no stripe_customer_id" do
    assert_nil @family.stripe_customer_id

    get settings_payment_path
    assert_response :forbidden
  end

  test "shows payment settings when family has stripe_customer_id" do
    @family.update!(stripe_customer_id: "cus_test123")

    get settings_payment_path
    assert_response :success
    assert_select(
      "a[href=?]",
      Rails.application.config.x.stripe.one_time_contribution_url,
      text: I18n.t("views.settings.payments.show.one_time_contribution_link_text")
    )
  end
end