There's no reason for guides to reference old behaviors. They should
be current as of the versions of Rails that they ship with, and including
older information just clutters thing.
I discussed this change with @fxn and he agrees.
As issue #7978, the order in which ActionMailer
sends multipart messages could be unintentionally
overwritten if a block is passed to the mail
method. This changes the mail method such that
:parts_order is always respected, regardless of
whether a block is passed to mail.
Change the default test locations to avoid confusion around the common
testing terms "unit" and "functional".
Add new rake tasks for the new locations, while maintaining backwards
compatibility with the old rake tasks.
New testing locations are as follows:
app/models -> test/models (was test/units)
app/helpers -> test/helpers (was test/units/helpers)
app/controllers -> test/controllers (was test/functional)
app/mailers -> test/mailers (was test/functional)
