When changing code in mailers, updating the corresponding mailer preview is easily forgotten.

Mailer previews can be tested like other code as well and I sometimes add the following test to test suites:

# Make sure to require the previews
Dir[Rails.root.join('test/mailers/previews/*.rb')].sort.each { |file| require(file) }


ActionMailer::Preview.all.index_with(&:emails).each do |preview, mails|
mails.each do |mail|
    describe preview do
      specify "##{mail} works" do
        expect { preview.call(mail) }.not_to raise_error
      end
    end
  end
end

This reminder solves the problem of broken mailer previews.

Niklas Hä.

Say thanks5

Last edit

5 days ago

Michael Leimstädtner

Keywords

previews, actionmailer

License

Source code in this card is licensed under the MIT License.

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Posted by Niklas Hä. to makandra dev (2022-05-13 06:53)

Do not forget mailer previews

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