If you set the timezone in @config/additional_environment.rb@ and test it, any tests may fail.

config.time_zone = 'International Date Line West'   # UTC-12:00

The test will always fail if the date of today on @UTC@ and the date of today on @config.time_zone@ are different.

$ RAILS_ENV=test bundle exec rake db:migrate:reset

$ RAILS_ENV=test bundle exec rake test
Run options: --seed 21968

# Running:

....................F

Failure:
MailerTest#test_reminders [./test/unit/mailer_test.rb:694]:
"Bug #3: Error 281 when updating a recipe (5 days late)" not found in "1 issue(s) that are assigned to you are due in the next 42 days::

* eCookbook - Bug #3: Error 281 when updating a recipe (6 days late)

View all issues (2 open)
http://localhost:3000/issues?assigned_to_id=me&set_filter=1&sort=due_date%3Aasc

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bin/rails test test/unit/mailer_test.rb:687

................F

Failure:
MailerTest#test_reminders_should_sort_issues_by_due_date [./test/unit/mailer_test.rb:823]:
<(?-mix:foo \(1 day late\))> expected but was
..
Expected 0 to be >= 1.


bin/rails test test/unit/mailer_test.rb:811

........F

Failure:
MailerTest#test_reminders_language_auto [./test/unit/mailer_test.rb:717]:
"Bug #3: Error 281 when updating a recipe (En retard de 5 jours)" not found in "1 demande(s) qui vous sont assignées arrivent à échéance dans les 42 prochains jours ::

* eCookbook - Bug #3: Error 281 when updating a recipe (En retard de 6 jours)

Voir toutes les demandes (2 ouvertes)
http://localhost:3000/issues?assigned_to_id=me&set_filter=1&sort=due_date%3Aasc

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bin/rails test test/unit/mailer_test.rb:708

....F

Failure:
MailerTest#test_reminder_should_include_issues_assigned_to_groups [./test/unit/mailer_test.rb:773]:
"Assigned to group (Due in 5 days)" not found in "1 issue(s) that are assigned to you are due in the next 7 days::

* eCookbook - Bug #15: Assigned to group (Due in 4 days)

View all issues (2 open)
http://localhost:3000/issues?assigned_to_id=me&set_filter=1&sort=due_date%3Aasc

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bin/rails test test/unit/mailer_test.rb:749

.......F

Failure:
MailerTest#test_reminders_for_users [./test/unit/mailer_test.rb:746]:
"Bug #3: Error 281 when updating a recipe (5 days late)" not found in "1 issue(s) that are assigned to you are due in the next 42 days::

* eCookbook - Bug #3: Error 281 when updating a recipe (6 days late)

View all issues (2 open)
http://localhost:3000/issues?assigned_to_id=me&set_filter=1&sort=due_date%3Aasc

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bin/rails test test/unit/mailer_test.rb:738

...........

Finished in 411.745744s, 12.2090 runs/s, 56.3649 assertions/s.
5027 runs, 23208 assertions, 5 failures, 0 errors, 7 skips

You have skipped tests. Run with --verbose for details.
$