Testing Action Mailbox receiving an email with no body context but an attachment

action_mailbox_without_body.rb

# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails"
  # If you want to test against edge Rails replace the previous line with this:
  # gem "rails", github: "rails/rails", branch: "main"

  gem "sqlite3"
end

require "active_record/railtie"
require "active_storage/engine"
require "action_mailbox/engine"
require "tmpdir"

class TestApp < Rails::Application
  config.load_defaults Rails::VERSION::STRING.to_f

  config.root = __dir__
  config.hosts << "example.org"
  config.eager_load = false
  config.session_store :cookie_store, key: "cookie_store_key"
  config.secret_key_base = "secret_key_base"

  config.logger = Logger.new($stdout)
  Rails.logger  = config.logger

  config.active_storage.service = :local
  config.active_storage.service_configurations = {
    local: {
      root: Dir.tmpdir,
      service: "Disk"
    }
  }

  config.action_mailbox.ingress = :relay
end

ENV["DATABASE_URL"] = "sqlite3::memory:"

Rails.application.initialize!

require ActiveStorage::Engine.root.join("db/migrate/20170806125915_create_active_storage_tables.rb").to_s
require ActionMailbox::Engine.root.join("db/migrate/20180917164000_create_action_mailbox_tables.rb").to_s

ActiveRecord::Schema.define do
  CreateActiveStorageTables.new.change
  CreateActionMailboxTables.new.change
end

class ApplicationMailbox < ActionMailbox::Base
  routing (/^report@/i) => :dmarc_report
end

class DmarcReportMailbox < ActionMailbox::Base
  def process
    $attachments = mail.attachments
  end
end

require "minitest/autorun"

class DmarcReportMailboxTest < ActionMailbox::TestCase
  setup do
    source = <<~SOURCE
      Return-Path: <noreply-dmarc-support@google.com>
      Received: from mail-qt1-f202.google.com (mail-qt1-f202.google.com [209.85.160.202])
      by inbound-smtp.ap-southeast-2.amazonaws.com with SMTP id 26357nglg0b5tii5omf2tachvofqs9jrq5eslt01
      for report@dmarc.eduadv.com.au;
      Sun, 14 Jan 2024 10:48:55 +0000 (UTC)
      X-SES-Spam-Verdict: PASS
      X-SES-Virus-Verdict: PASS
      Received-SPF: pass (spfCheck: domain of google.com designates 209.85.160.202 as permitted sender) client-ip=209.85.160.202; envelope-from=noreply-dmarc-support@google.com; helo=mail-qt1-f202.google.com;
      Authentication-Results: amazonses.com;
      spf=pass (spfCheck: domain of google.com designates 209.85.160.202 as permitted sender) client-ip=209.85.160.202; envelope-from=noreply-dmarc-support@google.com; helo=mail-qt1-f202.google.com;
      dkim=pass header.i=@google.com;
      dmarc=pass header.from=google.com;
      X-SES-RECEIPT: AEFBQUFBQUFBQUFHcGR1UnNvYlhVbXFod2pNZ3ZiYmt4V3JnTStYa1BXSVlkR2FJTkV1RFl5OXU1M1grOGdSZTkraUtCeUZEV0pBL1R1S3ViS3NSaXlJVTFjNUhsaGhoTTEzWW1wSVZ5RTdlRzgyWlVnM3ZRRmY2VkJod3M4aXpsY2NQa2MwZitaUmJYaG42Y2oyMjdpZXNEZkgxQ2FueTJKNTZLdHMrbUduM29tWVZZcFRBV2hNbXV4cy9BMUozcUxKQjE0c0ZIZzd1c3ZmdWxqcWd6MGdhLy8vQUROdk5SQ0VaV0x5WGsxdDdlUXErZ0p1VXI5ZDFDdjA5NTN3S21CSnJJbEJOT29CaFY0RzZ0YzlaZXp2VWhObXR6Qlg2UFlWY0t3c3g1bGtsWjNITUpxTGFJVmcxZjYxQzNMZGVEQ1NZY3Mya0RTNFE9
      X-SES-DKIM-SIGNATURE: a=rsa-sha256; q=dns/txt; b=X3DHB3cy6l12gvJWTVIxGcB4KPn+YBD8YDqKTNEY8OQtfrWoONjUPR0kVOZ8YIzTQk+f3n/r3fNC3YfP4LXOhvcXX2JOFaEVWoXztP+/lG1cHAv+gHDUk5O2pFg/rf571iofwtgs3l0NJtCgMvg9rN0RYk4kHMtYfiYH9sJnmxY=; c=relaxed/simple; s=ulrbq2zjesb42hdt6rpnifgor3epinsy; d=amazonses.com; t=1705229335; v=1; bh=xKwd+W/bWH/znbCrRbFtTQpBB5/DtaOjr/JzGbp1wjU=; h=From:To:Cc:Bcc:Subject:Date:Message-ID:MIME-Version:Content-Type:X-SES-RECEIPT;
      Received: by mail-qt1-f202.google.com with SMTP id d75a77b69052e-429c7bfb94bso49565381cf.2
              for <report@dmarc.eduadv.com.au>; Sun, 14 Jan 2024 02:48:54 -0800 (PST)
      DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
              d=google.com; s=20230601; t=1705229332; x=1705834132; darn=dmarc.eduadv.com.au;
              h=content-transfer-encoding:content-disposition:to:from:subject
              :message-id:date:mime-version:from:to:cc:subject:date:message-id
              :reply-to;
              bh=xKwd+W/bWH/znbCrRbFtTQpBB5/DtaOjr/JzGbp1wjU=;
              b=KnS2xIXURrLLENNMHWxoJH5f1DUGFCW+QVhoEKsMFLpmZbK8vz81OKD38cOOOlDZvD
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              WeYltusZyRgKXX2mKD6JNZlgvJMo0+1YBaSa64hrv4lfXrYEcT7O5idEPrNtO+U2tATq
              oVdT418RqmHdoIwoltGs6kEE8JxVEZ1n5BPTybYxgsfrwuoaew0BlN9/OTogeOU8np8o
              oKqg==
      X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
              d=1e100.net; s=20230601; t=1705229332; x=1705834132;
              h=content-transfer-encoding:content-disposition:to:from:subject
              :message-id:date:mime-version:x-gm-message-state:from:to:cc:subject
              :date:message-id:reply-to;
              bh=xKwd+W/bWH/znbCrRbFtTQpBB5/DtaOjr/JzGbp1wjU=;
              b=cDhlz17ObSMMbyM9RVnVodb9nd7MDVGXaBZGgJeAfwhvDA9xQD8gSyvCCHst+NPMgu
              BT5uDScsk4P4VNzWEIc7PodloGVPjdDQKmzONa/tlclva6GA10AbFXbo0+eMdTlPWMvd
              ubcHIgFWFF5GR+hssMsuNTZ6v4RqFXxXxG8nG8wzBSmnUMCcXeoCJ4afAvBcPPvw6ZD5
              nY9eH1swD2O2KDcXrO9XxIx9D32H7+gd3KCiYKUsM4FwdpfbAwJqCVlmHG1t3hd20ltK
              3EAuClb57Si1Og8JakS861FMag8AcLbYuVHatMCKp1e0BzwL+sh8PvlubjJ73gQ/3kbi
              +SLQ==
      X-Gm-Message-State: AOJu0YxJsT8cNGInJvjvtsFswI9pmOj1SaghhMM4tYcMMt4UgXdgViKZ
        Vh92swywlgFuX3TE/TqXUg==
      X-Google-Smtp-Source: AGHT+IGCyTSQkQzppUTVhqiskyWQ0c3kGzgTPhgJzy9WD1li5vPgDF0WENyBXT+mq6OUA+ubwqXQCssCCuK4lQ==
      MIME-Version: 1.0
      X-Received: by 2002:ac8:5756:0:b0:429:96c4:3298 with SMTP id
      22-20020ac85756000000b0042996c43298mr28591qtx.9.1705229332731; Sun, 14 Jan
      2024 02:48:52 -0800 (PST)
      Date: Sat, 13 Jan 2024 15:59:59 -0800
      Message-ID: <17096490616065293100@google.com>
      Subject: Report domain: eduadv.com.au Submitter: google.com Report-ID: 17096490616065293100
      From: noreply-dmarc-support@google.com
      To: report@dmarc.eduadv.com.au
      Content-Type: application/zip; 
        name="google.com!eduadv.com.au!1705104000!1705190399.zip"
      Content-Disposition: attachment; 
        filename="google.com!eduadv.com.au!1705104000!1705190399.zip"
      Content-Transfer-Encoding: base64

      UEsDBAoAAAAIAAlSLlglSNngBQIAAEoFAAAyAAAAZ29vZ2xlLmNvbSFlZHVhZHYuY29tLmF1ITE3
      MDUxMDQwMDAhMTcwNTE5MDM5OS54bWy1VMFy2yAQvecrPL5bSI6tRB1CeuoXtGcNhpXMRAIGkBP/
      fcEgiTqdyaHTiw1vd9/uvl2EXz/GYXMBY4WSL9uqKLcbkExxIfuX7a+fP3bP280recAdAD9R9kYe
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      /D6nInMk8wuydH7LvMOiUJKgS4ZFpqzHu5x+bnNnWHCQTnTCv6Yl7AyUg2k7o8b7eeWmxPWJAdPJ
      nVsDdhrcSnpXcBq8PSstuuvt6cRXlG9E2vhARDS1Nizc7ZI1DgMwpwyho/bNz7dFgTztf6/BVl+W
      kI1nrSBkBlP8WyHZ6P1ruRtBcI6bjdH6WfwNUEsBAgoACgAAAAgACVIuWCVI2eAFAgAASgUAADIA
      AAAAAAAAAAAAAAAAAAAAAGdvb2dsZS5jb20hZWR1YWR2LmNvbS5hdSExNzA1MTA0MDAwITE3MDUx
      OTAzOTkueG1sUEsFBgAAAAABAAEAYAAAAFUCAAAAAA==
    SOURCE

    @inbound_email = receive_inbound_email_from_source(source)
  end

  test "the email has an attachment" do
    assert_equal $attachments.size, 1
  end
end