require 'test_helper' module ActiveModel class Serializer class FieldsetTest < ActiveSupport::TestCase def test_fieldset_with_hash fieldset = ActiveModel::Serializer::Fieldset.new('post' => %w(id title), 'comment' => ['body']) expected = { post: [:id, :title], comment: [:body] } assert_equal(expected, fieldset.fields) end end end end