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# Mailer specs
By default Mailer specs reside in the `spec/mailers` folder. Adding the metadata
`type: :mailer` to any context makes its examples be treated as mailer specs.
A mailer spec is a thin wrapper for an ActionMailer::TestCase, and includes all
of the behavior and assertions that it provides, in addition to RSpec's own
behavior and expectations.
## Examples
```ruby
require "rails_helper"
RSpec.describe Notifications, type: :mailer do
describe "notify" do
let(:mail) { Notifications.signup }
it "renders the headers" do
expect(mail.subject).to eq("Signup")
expect(mail.to).to eq(["to@example.org"])
expect(mail.from).to eq(["from@example.com"])
end
it "renders the body" do
expect(mail.body.encoded).to match("Hi")
end
end
end
```
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