Parts not parsed with ActionMailer

[Aeris Imirhil]

Hello here,

I got a trouble with mail in a rails 6.0 application (actionmailer 6.0.3.4, ruby 2.7.2, mail 2.7.1).

My rspec test is as follow:

```
some_action_supposed_to_send_an_email
expect(ActionMailer::Base.deliveries).to_not be_empty
mail = ActionMailer::Base.deliveries.pop
expect(mail.subject).to eq 'something'
# binding.pry
expect(mail.text_part.body.to_s).to eq 'some content'
```

When I run this test, I catch a nil value on `mail.text_part` and the test fails…

Debugging with the `binding.pry` uncommented, I observed the mail structure is correct but `body.parts` is not filled correctly:

```

> mail
=> #<Mail::Message:18760, Multipart: false, Headers: <Date: Fri, 01 Jan 2021 21:51:06 +0100>, <From: monit...@example.org>, <Reply-To: nor...@example.org>, <To: moni...@example.org>, <Message-ID: <5fef8b3a43bd8...@endor.mail>>, <Subject: Service is DOWN: [ping] test>, <Mime-Version: 1.0>, <Content-Type: text/plain>, <Content-Transfer-Encoding: 7bit>>

> mail.text_part

=> nil

> mail.body.parts
=> []

```

If I force something I don't identify very well at the moment with a `mail.part` call, `body.parts` is now correctly filled and `mail.text_part` returns correct content:

```

> mail.part

=> [#<Mail::Part:18760, Multipart: false, Headers: <Content-Type: text/plain;>>,
 #<Mail::Part:18780, Multipart: false, Headers: >]

> mail.body.parts
=> [#<Mail::Part:18760, Multipart: false, Headers: <Content-Type: text/plain;>>,
 #<Mail::Part:18780, Multipart: false, Headers: >]

> mail.text_part

=> #<Mail::Part:18760, Multipart: false, Headers: <Content-Type: text/plain;>>

=>

```

And so adding a dangling `mail.part` just before expectations allows the test to pass.

And it's not satisfying at all :D

What's the trouble in my case and why mail seems not completely parsed during rspec?

Regards,

[Mikel Lindsaar]

It's been a while since I've looked at that code, but I've got a feeling it's because your email is not a multi part email.

When you are inspecting the mail message, it's not a mime email, it's just a text/plain email.  Text plain emails don't have html parts or text parts, they just have a plain body.

```

expect(mail.body.to_s).to eq 'some content'

```

Would work the way you expect.

If you define a HTML and a Plain Text partial, then you would be sending a mime email and you could then use text and html body parts.

Best

Mikel

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