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/agent_notifications/conversation_notifications_mailer_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AgentNotifications::ConversationNotificationsMailer, type: :mailer do
+  let(:class_instance) { described_class.new }
+  let(:agent) { create(:user, email: 'agent1@example.com') }
+  let(:conversation) { create(:conversation, assignee: agent) }
+
+  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
+
+  describe 'conversation_created' do
+    let(:mail) { described_class.conversation_created(conversation, agent).deliver_now }
+
+    it 'renders the subject' do
+      expect(mail.subject).to eq("#{agent.name}, A new conversation [ID - #{conversation
+        .display_id}] has been created in #{conversation.inbox&.name}.")
+    end
+
+    it 'renders the receiver email' do
+      expect(mail.to).to eq([agent.email])
+    end
+  end
+
+  describe 'conversation_assigned' do
+    let(:mail) { described_class.conversation_assigned(conversation, agent).deliver_now }
+
+    it 'renders the subject' do
+      expect(mail.subject).to eq("#{agent.name}, A new conversation [ID - #{conversation.display_id}] has been assigned to you.")
+    end
+
+    it 'renders the receiver email' do
+      expect(mail.to).to eq([agent.email])
+    end
+  end
+end