combined consumer and proxy into minimal rails backed

tests/.ruby-gemset

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+bettermail_tests

tests/.ruby-version

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+ruby-2.7.2

tests/Gemfile

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+source 'https://rubygems.org'
+ruby '2.7.2'
+gem 'bunny'
+gem 'mail'
+

tests/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    amq-protocol (2.3.2)
+    bunny (2.19.0)
+      amq-protocol (~> 2.3, >= 2.3.1)
+      sorted_set (~> 1, >= 1.0.2)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    mini_mime (1.1.2)
+    rbtree (0.4.5)
+    set (1.0.3)
+    sorted_set (1.0.3)
+      rbtree
+      set (~> 1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bunny
+  mail
+
+RUBY VERSION
+   ruby 2.7.2p137
+
+BUNDLED WITH
+   2.1.4

tests/test_sending_emails.rb

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+# frozen_string_literal: true
+
+require 'mail'
+require 'bunny'
+require 'securerandom'
+
+@default_smtp_settings = {
+      address: 'localhost',
+      port: '2025',
+      user_name: 'hello',
+      password: 'world',
+      enable_starttls_auto: true,
+      authentication: 'plain',
+      openssl_verify_mode: 'none'
+    }
+
+def send_mail(index)
+  mail = Mail.new(
+    from: "test-#{index}-#{SecureRandom.uuid}@thefactory.local",
+    to: "#{SecureRandom.uuid}@acme.local",
+    cc: "cc-#{SecureRandom.uuid}@acme.local",
+    bcc: "bcc-#{SecureRandom.uuid}@acme.local",
+    subject: "Testing #{index}",
+  )
+  mail.delivery_method :smtp, @default_smtp_settings
+  mail.deliver!
+end
+
+number_of_emails = ARGV[0] || 1
+
+send_mail number_of_emails