gistfile1.txt

 return result.fail_with("The card doesn't have any available credit.") unless @card.credit_account && @card.credit_account.has_credit?
 return result.fail_with('Credit Account is frozen.') if @card.credit_account.frozen_credit?

tests
    context "with frozen credit" do
      setup do
        @card.credit_account.freeze_credit!
        @result = CallHandler.top_up_card(:version => :v1, :account_number => @card_with_topup.pan, :transaction_amount => @transaction_amount, :available_balance => 488.00, :ip_address => "127.0.0.01")
      end
#      
      should "fail" do
        assert_equal false, @result.success?
      end
#      
      should_change "CallHandlerLogEntry.unsuccessful.for_method('top_up_card').count", :by =>1
      should_not_change "CardTopUpTransaction.count"
     end