Rails%203%20In%20Action

Receiving emails
The final step for this spec is to actually parse the thing using the Receiver class,
and to check that it changes the related ticket’s comment count by 1:
lambda { Receiver.parse(mail) }.should(
change(comment.ticket.comments, :count).by(1)
)
The spec/mailers/receiver_spec.rb should now look like the following listing.
require 'spec_helper'
describe Receiver do
it "parses a reply from a comment update into a comment" do
comment = Factory(:comment)
ticket = comment.ticket
comment_email = ActionMailer::Base.deliveries.last
user = Factory(:user)
mail =
C Create new email
Mail.new(:from => user.email,
:subject => "Re: #{comment_email.subject}",
:body => %Q{This is a brand new comment
#{comment_email.default_part_body}
},
:to => comment_email.from)
end
end
Listing 12.15 spec/mailers/receiver_spec.rb
lambda { Receiver.parse(mail) }.should(
change(ticket.comments, :count).by(1)
)
ticket.comments.last.text.should eql("This is a brand new comment")
In this spec, you build a comment and reference the ticket for it. By creating a comment,
there will be an email going out that you can access using Action-
Mailer::Base.deliveries.last B because ActionMailer::Base.delivery_method
is set to :test. Using this email, you can compile a new email using Mail.new C 14 and
passing in some values using the original email’s methods. One of these values—
:body—is way more important than the others. For this value, you want to take the
original content of the email and then above it put the new comment text. You use
default_part_body D. From this new text, a comment should be created. That’s
exactly what you assert on the final few lines of this example by using RSpec’s change
E method. On these final lines, you only want to make sure that the comments count
has increased by one and that the latest comment has the text “This is a brand new
comment.”
14 This functionality is provided by the mail gem, on which Action Mailer depends.
B Access email
D
343
Insert original
email content
E Add 1 to comment count