rails对各类邮件的测试

前几天用assert_select_email来测试邮件内容：

 assert_select_email do
   items = assert_select "ol>li"
   items.each do
      # Work with items here...
   end
 end

程序在第一行中断，里面的断言并没有被执行，于是查看源码并调试：

      def assert_select_email(&block)
        deliveries = ActionMailer::Base.deliveries
        assert !deliveries.empty?, "No e-mail in delivery list"

        for delivery in deliveries
          for part in delivery.parts
            if part["Content-Type"].to_s =~ /^text\/html\W/
              root = HTML::Document.new(part.body).root
              assert_select root, ":root", &block
            end
          end
        end

      end

发现parts为空，原来这个断言只适用于multipart邮件，对于其它类型的邮件就束手无策了。上网查一下，给出这种方案，重写此方法：

      def assert_select_email(&block)
        deliveries = ActionMailer::Base.deliveries
        assert !deliveries.empty?, "No e-mail in delivery list"

        for delivery in deliveries
          for part in delivery.parts.empty? ? [delivery] : delivery.parts.select{|p| p["Content-Type"].to_s =~ /^text\/html\W/}

              root = HTML::Document.new(part.body).root
              assert_select root, ":root", &block
          end
        end

      end

当然，邮件内要有根节点，不然又会报错。

如果只想测试text/plain类型的邮件，可以在setup方法中加入：

    ActionMailer::Base.deliveries.clear #不清空的话，你得到的永远是第一个测试的邮件
    @emails = ActionMailer::Base.deliveries

测试内容：

    assert_equal 1, @emails.size
    email = @emails.first
    assert_equal '[e-mail]', email.to[0] #测收件人地址
    assert_match /your new password is/, email.body #测邮件内容

就写这么多了，欢迎补充挑错