1require "rails_helper"
 2
 3RSpec.describe UserMailer, type: :mailer do
 4  describe "registration email" do
 5    let(:user) { double User, username: "blah", email:"blah@example.com" }
 6    let(:mail) { UserMailer.registration_email(user) }
 7    it "renders the subject" do
 8      expect(mail.subject).to eql("Welcome to Strong Lifters.")
 9    end
10    it "renders the recipient email" do
11      expect(mail.to).to eql([user.email])
12    end
13    it "renders the sender email" do
14      expect(mail.from).to eql(["from@example.com"])
15    end
16    it "assigns a username" do
17      expect(mail.body.encoded).to match(user.username)
18    end
19  end
20end