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Elements of a good controller unit test This chapter specifically addresses writing unit tests for controller classes. We focus heavily on testing controller classes because test-driving the controllers ensures they re well designed. It s unlikely you ll end up with a bad design if you re practicing test-driven development. Poorly designed code tends to be untestable, so observable untestability is an objective gauge of poorly designed code.

It is very important to validate the value that is to be inserted into the style attribute using a whitelist approach (i.e., we must test that the string in question is in a set of strings that are sure to be safe in the given context). Regular expressions provide a convenient and efficient mechanism for the specification of sets of strings (and testing the inclusion therein). For example, we can specify the set of strings consisting of (a safe superset of) syntactically valid CSS color specifications with the following regular expression: ^([a-z]+)|(#[0-9a-f]+)$ This regular expression defines the set of strings that consist of either a sequence of one or more lowercase letters (a color name ), or the symbol # followed by one or more hexadecimal digits (a numeric color specification). The ^ and $ regular expression operators force a match at the beginning and end of the string. Failing to require a match of the entire string is a common mistake when using regular expressions for data validation. We note that the preceding regular expression does not match the exact set of strings that are valid CSS color specifications, but rather a superset thereof. For example, the strings brfff and #7 are matched, but represent a nonexistent color name and a numeric color specification

Note If you decide to work with Glade 2 instead of Glade 3, make sure to save often. Undo and redo support was not implemented in the older versions of Glade, and it is very frustrating if you accidentally overwrite an hour of work with one wrong mouse click!

If you re just getting started with unit testing, you might run into some common pitfalls. This chapter isn t meant to be an entire course on testing. There are already entire books on that, and we again recommend reading Roy Osherove s The Art of Unit Testing.

The second window shown when you launch Glade 3 is the widget palette, which lists all of the widgets available to you for designing your applications. A screenshot of the widget palette can be viewed in Figure 10-2.

A good controller unit test runs fast. We re talking 2,000 unit tests all running within 10 seconds. How is that possible .NET code runs quickly, so unit tests wait only for the processor and RAM. Unit tests run code only within the current application domain, so we don t have to deal with crossing application domain or process boundaries. We can quickly sabotage this fast test performance by breaking a fundamental rule of unit testing: allowing out-of-process calls. Out-of-process calls are orders of magnitude slower than in-process calls, and test performance will suffer. Ensure that you re faking out all controller dependencies, and the test will continue to run quickly.

with insufficient digits. However, it is reasonable to assume that providing such strings to the browser as a CSS color specification will not result in JavaScript execution. An even safer alternative would be to not derive the value to be inserted into the HTML document directly from user-controlled input, but rather externally expose a different parameter that is mapped to a fixed set of values. For example, we could externally expose an integer-valued parameter, color_id, and look up the corresponding CSS color specifier in a table (of course, not forgetting to bounds-check the index). As with all attributes, it is important to ensure that style attributes do not contain any (non-escaped) quote characters, and that their value is enclosed in quotes in the template.