discourse/spec/mailers/rejection_mailer_spec.rb

require "rails_helper"

describe RejectionMailer do

  describe "send_rejection" do

    context 'sends rejection email' do
      let (:user) { Fabricate(:user) }
      let (:template_args) { {former_title: "Mail Subject", destination: user.email, site_name: SiteSetting.title} }
      let (:reject_mail) { RejectionMailer.send_rejection("email_reject_topic_not_found", user.email, template_args) }

      it 'renders the senders email' do
        expect(reject_mail.to).to eql([user.email])
      end

      it 'renders the subject' do
        expect(reject_mail.subject).to be_present
      end

      it 'renders site title in subject' do
        expect(reject_mail.subject).to match(SiteSetting.title)
      end

      it 'renders the body' do
        expect(reject_mail.body).to be_present
      end
    end
  end
end