ruby-on-rails - ActionMailer 测试，Rails 指南文档中的 assert_equal 永远不会是真的吗？

Question

我正在阅读 Rails 3 指南，并查看测试邮件程序部分。

但是，按照这些说明，我想知道它们是否有问题，并且做出的断言永远都不是真的。

这是文档中的相关部分:

http://guides.rubyonrails.org/testing.html#testing-your-mailers

10.2.2 The Basic Test Case

In this test, @expected is an instance of TMail::Mail that you can use in your tests. It is defined in ActionMailer::TestCase. The test above uses @expected to construct an email, which it then asserts with email created by the custom mailer. The invite fixture is the body of the email and is used as the sample content to assert against. The helper read_fixture is used to read in the content from this file.

这就是我认为是这种情况的原因:

test_card_update_notification(CardSenderMailerTest) [/Users/victorstan/Sites/ContactMonkey/test/unit/card_sender_mailer_test.rb:21]:

<"Date: Mon, 12 Mar 2012 22:54:38 -0400\r\nFrom: ContactMonkey <support@contactmonkey.com>\r\nTo: test@contactmonkey.com\r\nMessage-ID: <4f5eb6ee903b3_710a3fd4d6034ec8484b1@Victor-Stans-MacBook-Pro.local.mail>\r\nSubject: Bob Smith's ContactMonkey Card Has Been Updated!\r\nMime-Version: 1.0\r\nContent-Type: text/plain;\r\n charset=UTF-8\r\nContent-Transfer-Encoding: 7bit\r\n\r\nHi Bob!\r\nYou asked to be notified when Bob Smith's card had been updated. You can view and download the new card by visiting their profile page:\r\n\r\nhttp://contactmonkey.com/bob\r\n\r\nUpdates at a glance:\r\n\r\n\tCard:\r\n\t\tTitle: Bauws\r\n\t\tOrganization: Fancy Org\r\n\t\tPersonal url: bob\r\n\r\n\tPhone:\r\n\t\tLabel: work\r\n\t\tNumber: 555 555 1234\r\n\r\n\tAddress:\r\n\t\tLabel: work\r\n\t\tStreet: 145 Dovercourt\r\n\t\tStreet2: \r\n\t\tCity: Toronto\r\n\t\tPostalcode: M6J3C5\r\n\t\tRegion: ON\r\n\t\tCountry: Canada\r\n\r\n\r\n\r\nMake it a great day!\r\nContactMonkey\r\n\r\nProblems? Write to us at support@contactmonkey.com, or just reply to this message.\r\nhttp://contactmonkey.com\r\n"> expected but was
<"Date: Mon, 12 Mar 2012 22:54:38 -0400\r\nFrom: ContactMonkey <support@contactmonkey.com>\r\nTo: test@contactmonkey.com\r\nMessage-ID: <4f5eb6eeaeae1_710a3fd4d6034ec848559@Victor-Stans-MacBook-Pro.local.mail>\r\nSubject: Bob Smith's ContactMonkey Card Has Been Updated!\r\nMime-Version: 1.0\r\nContent-Type: text/plain;\r\n charset=UTF-8\r\nContent-Transfer-Encoding: 7bit\r\n\r\nHi Bob!\r\nYou asked to be notified when Bob Smith's card had been updated. You can view and download the new card by visiting their profile page:\r\n\r\nhttp://contactmonkey.com/bob\r\n\r\nUpdates at a glance:\r\n\r\n\tCard:\r\n\t\tTitle: Bauws\r\n\t\tOrganization: Fancy Org\r\n\t\tPersonal url: bob\r\n\r\n\tPhone:\r\n\t\tLabel: work\r\n\t\tNumber: 555 555 1234\r\n\r\n\tAddress:\r\n\t\tLabel: work\r\n\t\tStreet: 145 Dovercourt\r\n\t\tStreet2: \r\n\t\tCity: Toronto\r\n\t\tPostalcode: M6J3C5\r\n\t\tRegion: ON\r\n\t\tCountry: Canada\r\n\r\n\r\n\r\nMake it a great day!\r\nContactMonkey\r\n\r\nProblems? Write to us at support@contactmonkey.com, or just reply to this message.\r\nhttp://contactmonkey.com\r\n">.

注意到区别了吗？

Message-ID: <4f5eb6ee903b3_710a3fd4d6034ec8484b1@Victor-Stans-MacBook-Pro.local.mail>

对比

Message-ID: <4f5eb6eeaeae1_710a3fd4d6034ec848559@Victor-Stans-MacBook-Pro.local.mail>

我该如何解释？据我所知，这不是我的数据的一部分，也不是我的控制权。

我正在使用的断言:

assert_equal @expected.encoded, CardSenderMailer.card_update_notification(card, followers, field_updates).encoded

这与文档中使用的非常相似:

assert_equal @expected.encoded, UserMailer.create_invite('me@example.com', 'friend@example.com', @expected.date).encoded

Answer 1

它不是很漂亮，但我做了类似下面的事情:

test "able to mail something" do
    # bunch of @expected statements
    assert_equal encode(@expected), encode(MyMailer.mail(@user))
end  

def encode message
    message.encoded.gsub(/Message-ID: <.+>/, '').gsub(/Date: .+/, '')
end

如果你想在邮件程序测试之间共享，那么修改 test_helper.rb 并添加:

class ActionMailer::TestCase
    def encode message
        message.encoded.gsub(/Message-ID: <.+>/, '').gsub(/Date: .+/, '')
    end
end