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These are all legitimate changes that normally occur over the lifetime of a project, so none of these changes should result in the test breaking. Ideally, our test should fail because of an assertion failure, not in the setup or execution phases. The solution for brittle tests at any layer is to design for testability. So far we ve treated our application as a black box. The test only used the final rendered HTML to build an interaction with the application. Instead of treating our application as a black box, we can design our user interface for stable, valuable user interface tests. In the next section, we ll look at creating maintainable navigation elements for our site.

The top-left corner of the fixed container is referred to by location (0,0). You should only be able to specify real locations for widgets or locations in positive space. The fixed container will resize itself, so every widget is completely visible. If you need to move a widget after it has been placed within a GtkFixed container, you can use gtk_fixed_move(). You need to be careful not to overlap a widget that has already been placed. The GtkFixed widget will not provide notification in the case of overlap. Instead, it will try to render the window with unpredictable results. void gtk_fixed_move (GtkFixed *fixed, GtkWidget *child, gint x_position, gint y_position); This brings us to the inherent problems with using the GtkFixed widget. The first problem is that your users are free to use whatever theme they want. This means that the size of text on the user s machine may differ from the size of text on your machine unless you explicitly set the font. The sizes of widgets vary among different user themes as well. This can cause misalignment and overlap. This is illustrated in Figure 3-6, which shows two screenshots of Listing 3-5, one with a small font size and one with a larger font size.

Our original test navigated to a specific URL inside the test. Although this might not change, we don t want each test to duplicate the starting URL. Things like port numbers and home page URLs can change over time. Instead, we can create a base test class that extracts the common setup and cleanup of our IE browser object, as shown in listing 20.2.

Figure 3-6. Problems caused by different font sizes in a GtkFixed container You can explicitly set the size and font of text to avoid overlap, but this is not advised in most cases. Accessibility options are provided for users with low vision. If you change their fonts, some users may not be able to read the text on the screen. Another problem with using GtkFixed arises when your application is translated into other languages. A user interface may look great in English, but the displayed strings in other languages may cause display problems, because the width will not be constant. Furthermore, languages that are read right to left, such as Hebrew and Arabic, cannot be properly mirrored with the GtkFixed widget. It is best to use a variable-sized container such as GtkBox or GtkTable in this case. Finally, it can be quite a pain adding and removing widgets from your graphical interface when using a GtkFixed container. Changing the user interface will require you to reposition all of your widgets. If you have an application with a lot of widgets, this presents a long-term maintenance problem. On the other hand, you have tables, boxes, and various other automatically formatting containers. If you need to add or remove a widget from the user interface, it is as easy as adding or removing a cell. This makes maintenance much more efficient, which is something you should consider in large applications.

It s not uncommon for users to keep their computers and applications running for long periods of time to avoid the inconvenience of booting up and reopening commonly used applications every morning Such users might use the computer s suspend functionality to save electricity while the computer is not actually in use; however, while the computer is suspended, application processes retain their in-memory state and behave essentially as if the computer was fully running and never suspended during the whole period..

[TestFixture] [ApartmentState(ApartmentState.STA)] public class WebTestBase { private IE _ie; [SetUp] public virtual void SetUp() {