By default Mailer specs reside in the spec/mailers folder. Adding the metadata
:type => :mailer to any context makes its examples be treated as mailer specs.
A mailer spec is a thin wrapper for an ActionMailer::TestCase, and includes all of the behavior and assertions that it provides, in addition to RSpec's own behavior and expectations.
require "rails_helper"
RSpec.describe Notifications, :type => :mailer do
describe "notify" do
let(:mail) { Notifications.signup }
it "renders the headers" do
expect(mail.subject).to eq("Signup")
expect(mail.to).to eq(["[email protected]"])
expect(mail.from).to eq(["[email protected]"])
end
it "renders the body" do
expect(mail.body.encoded).to match("Hi")
end
end
end