a simple user_mailer spec

user_mailer_spec.rb

require "rails_helper"

RSpec.describe UserMailer, type: :mailer do
  it 'sends a welcome email to user with password confirmation link' do
    user = create_new_user
    subject_line = "Welcome to this generic SaaS product #{user.first_name.capitalize}! Please confirm your email"
    generated_email = UserMailer.welcome_email_confirmation(user)
    expect(generated_email.subject).to eql subject_line
    expect(generated_email.to[0]).to eql user.email
    expect(generated_email.from[0]).to eql 'you@yourdomain.com'
  end
end