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Mailer specs

A simple passing example​

Given a file named "spec/mailers/notifications_mailer_spec.rb" with:

require "rails_helper"

RSpec.describe NotificationsMailer, type: :mailer do
  describe "notify" do
    let(:mail) { NotificationsMailer.signup }

    it "renders the headers" do
      expect(mail.subject).to eq("Signup")
      expect(mail.to).to eq(["to@example.org"])
      expect(mail.from).to eq(["from@example.com"])
    end

    it "renders the body" do
      expect(mail.body.encoded).to match("Hi")
    end
  end
end

When I run rspec spec

Then the example should pass.