Feature: Conversation creation email notifications (#576)

* Clean up the mailers

* Disable assignment mailer if setting is turned off

* Email notifications on conversation create

* Specs

spec/mailers/conversation_reply_mailer_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ConversationReplyMailer, type: :mailer do
+  describe 'reply_with_summary' do
+    let(:agent) { create(:user, email: 'agent1@example.com') }
+    let(:conversation) { create(:conversation, assignee: agent) }
+    let(:message) { create(:message, conversation: conversation) }
+    let(:mail) { described_class.reply_with_summary(message.conversation, Time.zone.now).deliver_now }
+    let(:class_instance) { described_class.new }
+
+    before do
+      allow(described_class).to receive(:new).and_return(class_instance)
+      allow(class_instance).to receive(:smtp_config_set_or_development?).and_return(true)
+    end
+
+    it 'renders the subject' do
+      expect(mail.subject).to eq("[##{message.conversation.display_id}] #{message.content.truncate(30)}")
+    end
+
+    it 'renders the receiver email' do
+      expect(mail.to).to eq([message&.conversation&.contact&.email])
+    end
+
+    it 'renders the reply to email' do
+      expect(mail.reply_to).to eq([message&.conversation&.assignee&.email])
+    end
+  end
+end