Improve documentation for Testing Your Mailers [ci skip]

The current Basic Test Case example has the following assertion

```
  assert_equal read_fixture('invite').join, email.body.to_s

```

email.body.to_s returns an empty string if both HTML and text templates
exist for a given mailer. This commit adds a note to section 11.2.2
explaining this and also suggests using email.text_part.body.to_s
and email.html_part.body.to_s as alternatives.
This commit is contained in:
James Baer 2017-02-27 10:17:27 -05:00
parent c971e7f151
commit 6bee72db6a

@ -1435,6 +1435,10 @@ variable. We then ensure that it was sent (the first assert), then, in the
second batch of assertions, we ensure that the email does indeed contain what we
expect. The helper `read_fixture` is used to read in the content from this file.
NOTE: `email.body.to_s` is present when there's only one (HTML or text) part present.
If the mailer provides both, you can test your fixture against specific parts
with `email.text_part.body.to_s` or `email.html_part.body.to_s`.
Here's the content of the `invite` fixture:
```