# frozen_string_literal: true require 'rails_helper' RSpec.describe DomainResource do describe '#mx' do subject { described_class.new(domain) } let(:domain) { 'example.host' } let(:exchange) { 'mx.host' } before { configure_mx(domain: domain, exchange: exchange) } it 'returns array of hostnames' do expect(subject.mx) .to eq([exchange]) end end end