Migrate email_process_identify_sender_max_test to RSpec

Gemfile

@@ -164,8 +164,9 @@ group :development, :test do
   # changelog generation
   gem 'github_changelog_generator'
 
-  # Use Factory Bot for generating random test data
+  # generate random test data
   gem 'factory_bot_rails'
+  gem 'faker'
 
   # mock http calls
   gem 'webmock'

Gemfile.lock

@@ -165,6 +165,8 @@ GEM
     factory_bot_rails (4.8.2)
       factory_bot (~> 4.8.2)
       railties (>= 3.0.0)
+    faker (1.9.1)
+      i18n (>= 0.7)
     faraday (0.12.2)
       multipart-post (>= 1.2, < 3)
     faraday-http-cache (2.0.0)
@@ -533,6 +535,7 @@ DEPENDENCIES
   eventmachine
   execjs
   factory_bot_rails
+  faker
   github_changelog_generator
   guard
   guard-livereload

spec/models/channel/email_parser_spec.rb

@@ -1,16 +1,49 @@
 require 'rails_helper'
 
 RSpec.describe Channel::EmailParser, type: :model do
+  let(:subject)   { described_class.new }
   let(:mail_file) { Rails.root.join('test', 'data', 'mail', 'mail001.box') }
   let(:raw_mail)  { File.read(mail_file) }
 
   describe '#process' do
     let(:raw_mail)    { File.read(mail_file).sub(/(?<=^Subject: ).*$/, test_string) }
-    let(:test_string) do
-      Setting.get('ticket_hook') + Setting.get('ticket_hook_divider') + ticket.number
-    end
+    let(:test_string) { Setting.get('ticket_hook') + Setting.get('ticket_hook_divider') + ticket.number }
     let(:ticket)      { create(:ticket) }
 
+    context 'for creating new users' do
+      context 'with one unrecognized email address' do
+        let(:raw_mail) { <<~RAW }
+          From: #{Faker::Internet.unique.email}
+          To: #{User.pluck(:email).reject(&:blank?).sample}
+          Subject: Foo bar
+
+          Lorem ipsum dolor
+        RAW
+
+        it 'creates one new user' do
+          expect { Channel::EmailParser.new.process({}, raw_mail) }
+            .to change { User.count }.by(1)
+        end
+      end
+
+      context 'with a large number (42+) of unrecognized email addresses' do
+        let(:raw_mail) { <<~RAW }
+          From: #{Faker::Internet.unique.email}
+          To: #{Array.new(22) { Faker::Internet.unique.email }.join(', ')}
+          Cc: #{Array.new(22) { Faker::Internet.unique.email }.join(', ')}
+          Subject: test max sender identify
+
+          Some Text
+        RAW
+
+        it 'never creates more than 41 users per email' do
+          expect { Channel::EmailParser.new.process({}, raw_mail) }
+            .to change { User.count }.by(41)
+        end
+      end
+    end
+
+    context 'for associating emails to tickets' do
       context 'when email subject contains ticket reference' do
         it 'adds message to ticket' do
           expect { described_class.new.process({}, raw_mail) }
@@ -50,7 +83,9 @@ RSpec.describe Channel::EmailParser, type: :model do
           end
         end
       end
+    end
 
+    context 'for sender/recipient address formatting' do
       # see https://github.com/zammad/zammad/issues/2198
       context 'when sender address contains spaces (#2198)' do
         let(:mail_file) { Rails.root.join('test', 'data', 'mail', 'mail071.box') }
@@ -90,7 +125,9 @@ RSpec.describe Channel::EmailParser, type: :model do
             .and include('mail_delivery_failed_data' => a_kind_of(ActiveSupport::TimeWithZone))
         end
       end
+    end
 
+    context 'for charset handling' do
       # see https://github.com/zammad/zammad/issues/2224
       context 'when header specifies Windows-1258 charset (#2224)' do
         let(:mail_file) { Rails.root.join('test', 'data', 'mail', 'mail072.box') }
@@ -102,3 +139,4 @@ RSpec.describe Channel::EmailParser, type: :model do
       end
     end
   end
+end

spec/support/faker.rb

@@ -0,0 +1,5 @@
+RSpec.configure do |config|
+  config.after(:each) do
+    Faker::UniqueGenerator.clear
+  end
+end

test/unit/email_process_identify_sender_max_test.rb

@@ -1,25 +0,0 @@
-require 'test_helper'
-
-class EmailProcessIdentifySenderMax < ActiveSupport::TestCase
-
-  test 'text max created recipients per email' do
-    current_users = User.count
-    email_raw_string = "From: #{generate_recipient}
-To: #{generate_recipient(22)}
-Cc: #{generate_recipient(22)}
-Subject: test max sender identify
-
-Some Text"
-
-    ticket_p, article_p, user_p, mail = Channel::EmailParser.new.process({}, email_raw_string)
-    ticket = Ticket.find(ticket_p.id)
-    assert_equal('test max sender identify', ticket.title)
-    assert_equal(current_users + 41, User.count)
-  end
-
-  def generate_recipient(count = 1)
-    uid = -> { rand(999_999_999_999_999) }
-    Array.new(count) { "#{uid.call}@#{uid.call}.example.com" }.join(', ')
-  end
-
-end