active_model_serializers/test/serializers/fieldset_test.rb

require 'test_helper'

module ActiveModel
  class Serializer
    class FieldsetTest < Minitest::Test
      def test_fieldset_with_hash
        fieldset = ActiveModel::Serializer::Fieldset.new({ 'post' => %w(id title), 'coment' => ['body'] })

        assert_equal(
          { :post => [:id, :title], :coment => [:body] },
          fieldset.fields
        )
      end

      def test_fieldset_with_array_of_fields_and_root_name
        fieldset = ActiveModel::Serializer::Fieldset.new(['title'], 'post')

        assert_equal(
          { :post => [:title] },
          fieldset.fields
        )
      end
    end
  end
end