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With a test in place, every time you modify the code that adds a new user, you can run the test to see if your change worked and, more important, whether your seemingly innocuous change broke something else If you stop and think about it, you re already testing your software The problem is that you re doing it manually, often in an ad hoc fashion You may make a change to the way users log in, and then you try it in your browser You make a change to the sign-up procedure, and then you take it for a spin As your application grows in size, it becomes more and more difficult to manually test like this, and eventually you miss something important Even if you re not testing, you can be sure that your users are.

right portion of the artboard (which contains the XML) are options to switch between design, XAML, and split-mode view. Click Split to see both the XAML and the design view at the same time, as shown in Figure 8-5.

For example, our hello function might require a name, but allow us to (optionally) specify the greeting and the punctuation: def hello_4(name, greeting='Hello', punctuation='!'): print '%s, %s%s' % (greeting, name, punctuation) This function can be called in many ways. Here are some of them:

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After all, they re the ones using the application in the wild, and they ll find bugs you never knew existed The best solution is to replace this sort of visual, ad hoc inspection with automatic checking Testing becomes increasingly important when you re refactoring existing code Refactoring is the process of improving the design of code without changing its behavior The best way to refactor is with a test in place acting as a safety net Because refactoring shouldn t result in an observable change in behavior, it shouldn t break your tests either It s easy, therefore, to see why many programmers won t refactor without tests Given the importance placed on testing, it may seem odd that this book leaves it to the tenth chapter Ideally, you should be writing tests as you go, never getting too far ahead without testing what you ve written.

5. Now edit this project in Visual Studio. In the Project panel, right-click the Ch8_BlendProjects project and select Edit in Visual Studio, as shown in Figure 8-6.

>>> hello_4('Mars') Hello, Mars! >>> hello_4('Mars', 'Howdy') Howdy, Mars! >>> hello_4('Mars', 'Howdy', '...') Howdy, Mars... >>> hello_4('Mars', punctuation='.') Hello, Mars. >>> hello_4('Mars', greeting='Top of the morning to ya') Top of the morning to ya, Mars! >>> hello_4() Traceback (most recent call last): File "<pyshell#64>", line 1, in hello_4() TypeError: hello_4() takes at least 1 argument (0 given)

But we decided that explaining how to test would be overwhelming while you were still learning the basics of Ruby and the Rails framework Now that you have a good deal of knowledge under your belt, it s time to tackle testing..

NOTE If you need to get the code at the exact point where you finished 9, download the zip file from http://github.com/downloads/ccjr/blog/chapter10.zip and extract it on your computer.

7. Modify the root Grid to add the following code shown in bold, to define a StackPanel with a TextBlock, TextBox, and Button. <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="ProjectsInBlend.Page" Width="640" Height="480">

Note If I had given name a default value as well, the last example wouldn t have raised an exception.

Rails defines three different kinds of tests, each designed to test a specific piece of your application:

<Grid x:Name="LayoutRoot" Background="White"> <StackPanel Margin="20" Orientation="Vertical"> <TextBlock Margin="5" Text="Enter Your Name:" /> <TextBox Margin="5" x:Name="txtName" /> <Button Margin="5" Content="Click Me!" /> </StackPanel> </Grid> </UserControl>

That s pretty flexible, isn t it And we didn t really have to do much to achieve it either. In the next section we get even more flexible.

Unit testing tests your models. Functional testing tests your controllers. Integration testing tests at a high level through multiple controllers.

With this change, your application should now look as shown in Figure 8-7.

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