Should send_email always succeeds?

Testing RSpec
1

I wrote the following in my spec:

 emails = ActionMailer::Base.deliveries
 emails.length.should eql(2)

 response.should send_email {
   with_tag('tr', @contact_info[:full_name])
 }

knowing that 1) an email is being sent; and 2) the contact info is in
a ‘p’ tag and only in a ‘p’ tag. The length expectation is met –
there are two emails. The send_email expectation is met, but should
not be, as the correct tag would be a ‘p’ and not a ‘tr’.

Any thoughts as to why?

Thx

–s