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Figure 27 Drawings can be derived from models (a) The 2D drawing is seen as a specific view (section) (b) of the 3D model (Images courtesy of Vico)

There are many variations on the preceding simple techniques to introduce seams into source code. For example, instead of adding a parameter to a constructor, you can add it directly to the method under test. Instead of sending in an interface, you could send a base class, and so on. Each variation has its own strengths and weaknesses.

1 Press the Prog key four times The weekday MORN time will flash 2 Use the arrow keys to change the scheduled time for the displayed period (MORN, DAY, EVE, or NITE) 3 Press the Prog key to advance to the next item 4 Use the arrow keys to change the desired cool setting 5 Press the Prog key to advance to the next item 6 Use the arrow keys to change the desired heat setting 7 Press the Prog key to advance to the next period

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Repeat the aforementioned steps for the DAY, EVE, and NITE settings Then, repeat those same steps to establish your temperature settings for Saturday and Sunday In order to better visualize how your heating and cooling settings can be established, we ve provided a table that shows the times of day and days of the week We ve also established at which points the system should kick in to either heat or cool the Smart Home This table (shown in Table 11-3) is helpful to organize your various heating and cooling settings We ve provided a blank table (Table 11-4) that you can use to sketch out your own HVAC settings

One of the reasons you may want to avoid using a base class instead of an interface is that a base class from the production code may already have (and probably has) built-in production dependencies that you ll have to know about and override. This makes implementing derived classes for testing harder than implementing an interface, which lets you know exactly what the underlying implementation is and gives you full control over it. In chapter 4, we ll look at techniques that can help you avoid writing manual stub classes that implement interfaces, and instead use frameworks that can help do this at runtime. But for now, let s look at another way to gain control over the code under test without using interfaces. You ve already seen one way of doing this in the previous pages, but this method is so effective it deserves a discussion of its own.

Figure 28 A traditional light table for drawing coordination (Image courtesy of F Booth Design M Build Co, subcontractor on this project of Turner Construction Sacramento)

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You ve already seen an example of Extract and Override in section 3.4.5. We derive from the class under test so that we can override a virtual method and force it to return our stub. But why stop there What if you re unable or unwilling to add a new interface every time you need control over some behavior in your code

A Sample Heating and Air Conditioning Schedule (continued)

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