## RSpec Stacktrace
1)
'Contacts#index should find all contacts and place them in @contacts' FAILED
expected: [],
     got: nil (using ==)
./spec/controllers/contacts_spec.rb:15:

## Spec
describe "#show" do
  before(:each) do
    @contact = mock(Contact, {})
  end

  it "should raise a NotFound error if can't find a contact by id" do
    Contact.should_receive(:find_by_id).with(1).and_return(nil)
    lambda do
      dispatch_to(Contacts, :show, :id => @contact.id)
    end.should raise_error(Merb::ControllerExceptions::NotFound)
  end
end

## Controller
def show
  @contact = current_user.contacts.find_by_id(params[:id])
  raise NotFound unless @contact
  display @contact
end