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document the behavior of `ActionMailer::Base.delivieries` in tests

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1 parent ee314a5 commit 18dceeb425a92254f534202ec6ced700cfdd1567 @senny senny committed Jan 26, 2013
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  1. +2 −0 guides/source/
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@@ -576,6 +576,8 @@ end
In the test we send the email and store the returned object in the `email` 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.
+NOTE: The `ActionMailer::Base.deliveries` array is only reset automatically in `ActionMailer::TestCase` tests. If you want to have a clean slate outside Action Mailer tests, you can reset it manually with: `ActionMailer::Base.deliveries.clear`
Intercepting Emails
There are situations where you need to edit an email before it's delivered. Fortunately Action Mailer provides hooks to intercept every email. You can register an interceptor to make modifications to mail messages right before they are handed to the delivery agents.

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