Maybe/test/interfaces/accountable_resource_interface_test.rb

require "test_helper"

module AccountableResourceInterfaceTest
  extend ActiveSupport::Testing::Declarative

  test "shows new form" do
    Family.any_instance.stubs(:get_link_token).returns("test-link-token")

    get new_polymorphic_url(@account.accountable)
    assert_response :success
  end

  test "shows edit form" do
    get edit_account_url(@account)
    assert_response :success
  end
end