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As we mentioned in 2, Ruby on Rails 1.1 introduced the concept of integration tests. Integration tests can be used to write tests that span multiple controllers and exercise the whole application, from the dispatcher to the database. Suppose that we wanted to write a test for the whole Emporium administration interface. The test would need to simulate the actions of one or more administrators: logging in to the application; administering authors, publishers, and books; and logging out. Integration tests are a good way of simulating these actions, as they can be used to ensure that related functionality works as expected when multiple controllers and actions are called in sequence. Another benefit of using integration tests is that they allow you to open multiple sessions, unlike functional tests, which use the same session for the whole test. Opening a new session is done by calling the open_session method, which returns a new session object. This opens up a whole new range of possibilities for testing your code. For example, you can simulate multiple users accessing the same application at the same time, and you can test for bugs that are related to the session. The open_session method also enables you to extend the session with your own methods. This technique can be used to write a domain-specific language (DSL).

Attributes are additional information provided to the clients that enable them to make informed decisions about the products they are looking at. Some examples of attributes are color, size, design, and

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.

Tip It s a good idea to try to create test cases that are based on the user story. Try to follow the same flow of actions and events as in the user story. Also test alternative use case flows, which might involve invalid user input, for example.

manufacturer. Attributes not only provide customers with additional information about products, but they also provide sorting options as customers browse the category inside the public interface. Attributes are also listed side-by-side if customers choose to compare two or more products. There are two submenus underneath Attributes: Manage Attributes and Manage Attribute Sets, as shown in Figure 4-20.

Sometimes it can be useful to allow the user to supply any number of parameters. For example, in the name-storing program (described earlier in this chapter), you can store only one name at a time. It would be nice to be able to store more names, like this: >>> store(data, name1, name2, name3) For this to be useful, you should be allowed to supply as many names as you wanted. Actually, that s quite possible. Try the following function definition: def print_params(*params): print params Here, I seemingly specify only one parameter, but it has an odd little star (or asterisk) in front of it. What does that mean Let s call the function with a single parameter and see what happens: >>> print_params('Testing') ('Testing',) You can see that what is printed out is a tuple because it has a comma in it. (Those tuples of length one are a bit odd, aren t they ) So using a star in front of a parameter puts it in a tuple The plural in params ought to give a clue about what s going on:

Jamis Buck, one of the Rails core team members, points out on his blog jamis.jamisbuck.org that one of the biggest benefits of using integration tests is that you can easily create DSLs. As discussed in 2, Rails itself uses DSLs for many tasks, such as ActiveRecord mappings and validations. A DSL, as its name implies, is a language you write in Ruby code (or other programming language) for a specific domain. In the context of the Emporium project, for example, one domain is the integration testing of our book administration interface. DSLs should support actions related to a domain. The following is an example of a DSL. If you read it line by line, you can get a sense of what it does, even without knowing too much about DSLs. require "#{File.dirname(__FILE__)}/../test_helper" class DSLTest < ActionController::IntegrationTest def test_browse_book_store george = new_session bob = new_session george.add_book(...) bob.view_book(...) bob.add_book_to_cart(...) end