need some guidance with a test

This is part of a rails project. The following method is part of the Ams class (a rails model). I'm a bit unsure of the rspec/bdd way of testing this method.

def persist_as_domains
  @current_domains.each do |d|
    dom = Domain.new
    dom.domain = d
    dom.source_id = 1
    dom.at = Time.now
    dom.save
  end
end

The following is what came out when I tried to write my test. Notice that the only thing I'm testing here is that each method is called a certain number of times. This doesn't test that the proper values are passed to the Domain model which is something I'd like to test, but I don't know how to do that since the methods are called in a loop with a different value each time. Am I even approaching this the right way?

 context "persisting as Domain" do
   setup do
     @ams = Ams.new
     @ams.get
     @ams.process
     puts Domain.class
     Domain.should_receive(:new).exactly(10).times
     Domain.should_receive(:domain).exactly(10).times
     Domain.should_receive(:source_id).exactly(10).times
     Domain.should_receive(:at).exactly(10).times
     Domain.should_receive(:save).exactly(10).times
     puts Domain.class
   end
   
   specify "should create new domain and save" do
     @ams.persist_as_domains
   end
 end