如何使用 RSpec 测试 Rails 3.2 ActionMailer 是否呈现正确的视图模板? [英] How can I test with RSpec that Rails 3.2 ActionMailer is rendering the correct view template?

问题描述

我正在使用 rspec-rails 并且我想测试我的邮件程序正在呈现正确的视图模板.

I am using rspec-rails and I want to test that my mailer is rendering the correct view template.

describe MyMailer do
  describe '#notify_customer' do
    it 'sends a notification' do
      # fire
      email = MyMailer.notify_customer.deliver

      expect(ActionMailer::Base.deliveries).not_to be_empty
      expect(email.from).to include "[e-mail]"

      # I would like to test here something like
      # ***** HOW ? *****
      expect(template_path).to eq("mailers/my_mailer/notify_customer")
    end
  end
end

这是一种有效的方法吗?或者我应该做一些完全不同的事情吗?

Is this a valid approach? Or shall I do something completely different to that?

更新

MyMailer#notify_customer 可能有一些逻辑(例如，取决于客户的语言环境)在不同情况下选择不同的模板.控制器在不同情况下呈现不同的视图模板或多或少是相似的问题.使用 RSpec 你可以写

MyMailer#notify_customer might have some logic (e.g. depending on the locale of the customer) to choose different template under different circumstances. It is more or less similar problem with controllers rendering different view templates under different circumstances. With RSpec you can write

expect(response).to render_template "....." 

它的工作原理.我正在为邮寄者寻找类似的东西.

and it works. I am looking for something similar for the mailers.

推荐答案

我认为这更接近上面的答案，因为它确实测试了隐式模板.

I think this is a step closer to the answer above, since it does test for implicit templates.

    # IMPORTANT!
    # must copy https://gitlab.com/gitlab-org/gitlab/-/blob/master/spec/support/helpers/next_instance_of.rb
    it 'renders foo_mail' do
      allow_next_instance_of(described_class) do |mailer|
        allow(mailer).to receive(:render_to_body).and_wrap_original do |m, options|
          expect(options[:template]).to eq('foo_mail')

          m.call(options)
        end
      end

      body = subject.body.encoded
    end

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