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namespace UnitTestingExamples.Controllers { public class ProductsController : Controller { private readonly IProductRepository _productRepository; public ProductsController(IProductRepository productRepository) { _productRepository = productRepository; } . . . snip . . . } }

void pango_layout_get_pixel_size (PangoLayout *layout, int *width, int *height); Now that you have retrieved the width of the tab, you need to create a new PangoTabArray with pango_tab_array_new(). This function receives the number of elements that should be added to the array and notification of whether the size of each element is going to be specified in pixels. void pango_tab_array_new (gint initial_size, gboolean positions_in_pixels); You should always create the tab array with only one element, because there is only one tab type supported at this time. If TRUE is not specified for the second parameter, tabs will be stored as Pango units; 1 pixel is equal to 1,024 Pango units. Before applying the tab array, you need to add the width. This is done with pango_tab_ array_set_tab(). The integer 0 refers to the first element in the PangoTabArray, the only one that should ever exist. PANGO_TAB_LEFT must always be specified for the third parameter, because it is currently the only supported value. The last parameter is the width of the tab in pixels. void pango_tab_array_set_tab (PangoTabArray *tabarray, gint tab_index, PangoTabAlign alignment, gint location); When you receive the tab array back from the function, you need to apply it to the whole of the text view with gtk_text_view_set_tabs(). This will make sure that all tabs within the text view are set to the same width. However, as with all other text view properties, this value can be overridden for individual paragraphs or sections of text. void gtk_text_view_set_tabs (GtkTextView *textview, PangoTabArray *tabs); When you are finished with the tab array, it can be freed with pango_tab_array_free() if it is no longer needed.

When we test the ProductsController, we don t need to supply the actual implementation of the IProductRepository interface. For the purposes of a unit test, we re testing only the ProductsController, and no external dependency is used. To maximize the localization of defects, our unit tests should test only a single class. We don t want a controller unit test to fail because we have a problem with our local database. In a unit test, we ll have to pass a test double into the ProductsController repository. A test double is a stand-in for an actual implementation, but one that we can manipulate to force our class under test to execute specific code paths. Our controller unit test will need to set up the stubbed IProductRepository with dummy data and then assert that the right action result is used, the right view is chosen, and the right data is passed to the view. This is shown in listing 26.11.

When manipulating text within a GtkTextBuffer, there are two objects that can be used to keep track of a position within the buffer: GtkTextIter and GtkTextMark. Functions are provided by GTK+ to translate between these two types of objects. Text iterators are used to represent a position between two characters in a buffer. They are utilized when manipulating text within a buffer. The problem presented by text iterators is that they automatically become invalidated when a text buffer is edited. Even if the same text is inserted and then removed from the buffer, the text iterator will still become invalidated, because iterators are meant to be allocated on the stack and used immediately.

Attributes such as href and src take URLs as arguments. Depending on the tag they are associated with, the URL may be interpreted, de-referenced, or loaded at the time the browser interprets the tag (e.g., <img src=...> tags), or loaded only when the user performs an action (e.g., <a href=...> tags). If the value of the URL attribute is computed dynamically and may be influenced by a attacker, the attacker can make the URL refer to a resource that we did not intend. This could result in all kinds of problems (e.g., page spoofing), but may in particular result in injection of malicious script.

[Test] public void Index_should_use_default_view_and_repository_data() { var products = new[] Sets up { test data new Product {Name = "Keyboard"}, new Product {Name = "Mouse"} }; Configures stub repository