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block, and then report the error using the TextBlock. You ll go with the latter approach here. And to keep things clean, you will make sure the error message is cleared if all works correctly. Here is the updated code:

Let s start with the first scenario. When the cart is empty, the user shouldn t be able to perform a checkout. This can be verified by replacing the test_truth method in test/integration/ checkout_test.rb with the code shown here: def test_that_empty_cart_shows_error_message get '/checkout' assert_response :redirect assert_redirected_to :controller => "catalog" assert_equal "Your shopping cart is empty! Please add something to it before proceeding to checkout.", flash[:notice] end This test verifies that when the cart is empty, we are redirected to the catalog page and an error message is displayed. If you run the test now, it fails, because we haven t implemented the controller yet. Open app/controllers/checkout_controller.rb in your editor and change the index method as follows: def index @order = Order.new @page_title = "Checkout" if @cart.books.empty flash[:notice] = "Your shopping cart is empty! Please add something to it before proceeding to checkout." redirect_to :controller => 'catalog' end end Also add the initialize_cart filter to the controller: class CheckoutController < ApplicationController before_filter :initialize_cart def index Recall that this filter was implemented in 5. It initializes the cart, so that we can access it from the Checkout controller and views. It also enables us to show the shopping cart to the right on the page (also implemented in 5). Execute the test with the following command: $ ruby test/integration/checkout_test.rb

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Let s demonstrate how Data Validation works with a simple introductory example. Suppose you need to enter state names as per their post office designations that is, their two-lettered abbreviations. 1. 2. Select any range and then click the Data Validation button. Its dialog box appears Click the drop-down arrow by Allow. You ll see (Figure 6 48):

void btnTry_Click(object sender, RoutedEventArgs e) { try { this.ellipse.Fill = new SolidColorBrush( Color.FromArgb( 255, byte.Parse(this.txtRed.Text), byte.Parse(this.txtGreen.Text), byte.Parse(this.txtBlue.Text) ) ); this.lblColor.Text = ""; } catch { this.lblColor.Text = "Error with R,G,B Values"; } } 7. Build and run the application to see what you get. Type 255, 0, and 0 in the Red,

You should see no errors. Perform a manual test by opening http://localhost:3000/ checkout. Because the shopping cart is empty, you should be redirected to the catalog page, where the error message in Figure 9-1 is displayed.

Figure 6 49. The Data Validation drop-down menu 3. Click Text length, and this set of fields appears (Figure 6 49):

Figure 6 50. Limiting text length in selected cells. Sounds like Twitter. 4. 5. Click the Data down arrow and a series of operators greater than, less than, equal to, between, etc., appears. Click on equal to (Figure 6 50):

Figure 9-1. The catalog page displaying an empty cart error message Next, we ll add a test for the second scenario. When the shopping cart contains one or more items (books), we want to display a form with three sections: contact information, shipping address, and billing information. First, add the following fixtures and test to test/integration/checkout_test.rb: fixtures :authors, :publishers, :books def test_that_placing_an_order_works post '/cart/add', :id => 1 get '/checkout' assert_response :success assert_tag :tag => 'legend', :content => 'Contact Information' assert_tag :tag => 'legend', :content => 'Shipping Address' assert_tag :tag => 'legend', :content => 'Billing Information' end The test begins by adding a book (defined in the books fixture file) to the cart by calling the /cart/add action. Then it accesses the checkout page and verifies that the request is successful. It proceeds by checking that the page contains the three required sections. This is done by looking for three legend tags having the following content: Contact Information, Shipping Address, and Billing Information. Now that we have the new test in place, we could try to run it, but it would fail miserably when it tries to find the three sections.

Green, and Blue text boxes, respectively, and then click the Try Color button. You should see the ellipse turn red. If, just for the fun of it, you leave one of the values blank or enter a value other than 0 through 255, you will see the error message. Now that we have taken a quick look at the TextBox control, let s turn our attention to two other common controls: CheckBox and RadioButton.

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