Rails - Jul 2012 - How to test a mailer that has a date with accents?

In my mailer I have a date with Spanish format:

sábado, 21 de julio del 2012

I have a custom formatter for that configured in my config/locales/es.yml

my_date_format: ! ''%A, %-d de %B del %Y, %k:%M''

I''m trying to test it this way:

test "date with accent" do
  mail = MyMailer.my_template

  assert_match I18n.l(@object.date, format: :my_date_format), mail.body.encoded
end

But it fails:

# Running tests:

F

Finished tests in 0.438078s, 2.2827 tests/s, 15.9789 assertions/s.

1) Failure: test_date_with_accent(MyMailerTest) 
[test/unit/mailers/my_mailer_test.rb:12]: Expected /sábado,\ 21\ de\ julio\ 
del\ 2012,\ 14:10/ to match "...... .......s=C3=A1bado, 21 de julio del 
2012, 14:10\r\n ........".

(I have omitted the rest of the email content)

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