关于 ruby?? on rails:RSpec should_receive 宏,包含需要测试的 id

RSpec should_receive macro that includes id of what needs to be tested

我怎样才能写出这样它才能通过而不用硬编码1。鸡和蛋。

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@sender = Factory(:user)
@receiver = Factory(:user)

mailer = double
mailer.should_receive(:deliver)
Mailer.should_receive(:email).with(1, @sender.id, @receiver.id).and_return(mailer)

# This will create an object with id #1 to make this test pass
@object = Object.create(:sender => @sender, :receiver => @receiver)


这个怎么样?

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Mailer.should_receive(:email).with(an_instance_of(Fixnum), @sender.id, @receiver.id).and_return(mailer)