Rails - How to test that ActionMailer sent a specific attachment?

Question

In my ActionMailer::TestCase test, I\'m expecting:

@expected.to      = BuyadsproMailer.group_to(campaign.agency.users)
@expected.subject = \"You submitted #{off         


        

Answer 1

I had something similar where I wanted to check an attached csv's content. I needed something like this because it looks like \r got inserted for newlines:

expect(mail.attachments.first.body.encoded.gsub(/\r/, '')).to(
  eq(
    <<~CSV
      "Foo","Bar"
      "1","2"
    CSV
  )
)