Test registration e-mail

config/application.rb.dist

@@ -34,7 +34,7 @@ module FixinMe
     # SETUP: Below settings need to be updated on a per-installation basis.
     #
     # URL to use in sent e-mails.
-    config.action_mailer.default_url_options = {host: 'localhost'}
+    config.action_mailer.default_url_options = {host: 'localhost', :protocol => 'https'}
     # https://guides.rubyonrails.org/configuring.html#config-action-mailer-delivery-method
     config.action_mailer.delivery_method = :sendmail
 

config/environments/test.rb

@@ -39,6 +39,7 @@ Rails.application.configure do
   # The :test delivery method accumulates sent emails in the
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
+  config.action_mailer.default_url_options = {host: '127.0.0.1', :protocol => 'http'}
 
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr

test/system/users_test.rb

@@ -28,15 +28,26 @@ class UsersTest < ApplicationSystemTestCase
   test "register" do
     visit new_user_session_url
     click_link t(:register)
+
     fill_in User.human_attribute_name(:email).capitalize, with: random_email
     password = random_password
     fill_in User.human_attribute_name(:password).capitalize, with: password
     fill_in t('users.registrations.new.password_confirmation'), with: password
     assert_difference ->{User.count}, 1 do
-      click_on t(:register)
+      assert_emails 1 do
+        click_on t(:register)
+      end
     end
+
     assert_no_current_path new_user_registration_path
     assert_text t('devise.registrations.signed_up_but_unconfirmed')
+
+    with_last_email do |mail|
+      visit Capybara.string(mail.body.to_s).find_link("Confirm my account")[:href]
+    end
+    assert_current_path new_user_session_path
+    assert_text t('devise.confirmations.confirmed')
+    assert User.last.confirmed?
   end
 
   #test "visiting the index" do

test/test_helper.rb

@@ -10,6 +10,7 @@ class ActiveSupport::TestCase
   fixtures :all
 
   include AbstractController::Translation
+  include ActionMailer::TestHelper
 
   def randomize_user_password!(user)
     random_password.tap { |p| user.update!(password: p) }
@@ -22,4 +23,8 @@ class ActiveSupport::TestCase
   def random_email
     "%s@%s.%s" % (1..3).map { SecureRandom.alphanumeric(rand(1..20)) }
   end
+
+  def with_last_email
+    yield(ActionMailer::Base.deliveries.last)
+  end
 end