chatwoot/spec/mailboxes/mailbox_helper_spec.rb

require 'rails_helper'

RSpec.describe MailboxHelper do
  include ActionMailbox::TestHelper

  # Setup anonymous class
  let(:mailbox_helper_obj) do
    Class.new do
      include MailboxHelper
      attr_accessor :conversation, :processed_mail

      def initialize(conversation, processed_mail)
        @conversation = conversation
        @processed_mail = processed_mail
      end
    end
  end

  let(:mail) { create_inbound_email_from_fixture('welcome.eml').mail }
  let(:processed_mail) { MailPresenter.new(mail) }
  let(:conversation) { create(:conversation) }
  let(:dummy_message) { create(:message) }

  describe '#create_message' do
    before do
      create_list(:message, 5, conversation: conversation)
    end

    context 'when message already exist' do
      it 'creates a new message' do
        helper_instance = mailbox_helper_obj.new(conversation, processed_mail)

        expect(conversation.messages).to receive(:find_by).with(source_id: processed_mail.message_id).and_return(dummy_message)
        expect(conversation.messages).not_to receive(:create!)

        helper_instance.send(:create_message)
      end
    end

    context 'when message does not exist' do
      it 'creates a new message' do
        helper_instance = mailbox_helper_obj.new(conversation, processed_mail)

        expect(conversation.messages).to receive(:find_by).with(source_id: processed_mail.message_id).and_return(nil)
        expect(conversation.messages).to receive(:create!)

        helper_instance.send(:create_message)
      end
    end
  end
end