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This stub extension manager will always return true, no matter what the file extension is. We can use it in our tests to make sure that no test will ever have a dependency on the filesystem, but also so we can create new and bizarre scenarios where we can simulate serious system errors like making the stub manager throw an OutOfMemoryException and seeing how the system deals with it. Later in this chapter, we ll add configurability to the stub class so it can emulate many things and be used by multiple tests. Now we have an interface and two classes implementing it, but our method under test still calls the real implementation directly:

9

Figure 9-5

public bool IsValidLogFileName(string fileName) { IExtensionManager mgr = new FileExtensionManager();

An agreement was made with the MEPS trades that RQC would provide the model builds from dwg files supplied by each trade The final contract coordination was still the responsibility of the mechanical/plumbing vendor (Frank M Booth)

Heavy duty plug-in X10 module (Photo courtesy Smarthomecom)

public class ServiceATest extends TestCase private boolean serviceMethodCalled; public static class MockDatabase static int findMethodCallCount; static int saveMethodCallCount; public static void save(Object o) assertNotNull(o); saveMethodCallCount++; } {

Heavy-duty modules can be purchased in 15 amp and 20 amp varieties (retailing for US$2099) Make sure to check the prongs on your appliance to make sure you purchase the correct module Twenty amp modules utilize a t-shaped plug for the leftmost pin and a horizontal plug for the rightmost pin Fifteen amp modules use two horizontal plugs for both pins

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Wall receptacles, like the one shown in Figure 9-6, allow you to provide X10 functionality to a specific outlet

The design and the MEPS coordination planning were based on the following decisions: Systems to coordinate:

public static List find(String ql, Object arg1) assertNotNull(ql); assertNotNull(arg1); findMethodCallCount++; return Collections.EMPTY_LIST; } } protected void setUp() throws Exception { super.setUp(); MockDatabase.findMethodCallCount = 0; MockDatabase.saveMethodCallCount = 0; Mockit.redefineMethods(Database.class, MockDatabase.class); }

Figure 9-6

X10 wall receptacle (Photo courtesy Smarthomecom)

public void testDoBusinessOperationXyz() throws Exception final BigDecimal total = new BigDecimal("125.40");

HVAC ducting FMB (Frank M Booth, mechanical/plumbing vendor) Mechanical equipment FMB Plumbing (waste) FMB

Wall receptacles come in a variety of flavors, including standard designs (both outlets are X10 controlled), split (only one of the outlets is X10 enabled, the other outlet is always on), or heavy duty (which can accommodate large appliances) Heavy-duty receptacles (like the one shown in Figure 9-7) sell for US$4599, while standard 110V units run anywhere between US$18 and US$30

Mockit.redefineMethods(ServiceB.class, new Object() { public BigDecimal computeTotal(List items) { assertNotNull(items); serviceMethodCalled = true; return total; } }); EntityX data = new EntityX(5, "abc", "5453-1"); new ServiceA().doBusinessOperationXyz(data); assertEquals(total, data.getTotal()); assertTrue(serviceMethodCalled); assertEquals(1, MockDatabase.findMethodCallCount); assertEquals(1, MockDatabase.saveMethodCallCount); } }

Figure 9-7

Figure 521 (Continued )

Heavy-duty X10 wall receptacle (Photo courtesy Smarthomecom)

Michael Feathers wrote an interesting tool for Java that allows you to verify that you aren t messing up the values that may change in your method while refactoring it. For example, if your method changes an array of values, you want to make sure that as you refactor you don t screw up a value in the array. Listing 9.3 shows an example of using the Vise.grip() method for such a purpose.

There s a certain amount of paradigm shift that must accompany the use of X10 outlets Whereas plug-in modules are useful to go with a lamp or an appliance to any outlet in the house, once you install a wall receptacle, that receptacle will control whatever is plugged into it As such, if you decide to reorganize the living room and move the stereo to the other side of the room, you must bring the receptacle (or install a new one) if you expect to continue with your X10 functions

import vise.tool.*; public class RPRequest { ... public int process(int level, RPPacket packet) {

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To bring integrated control of our Smart Home specifically the X10 devices we re advocating the use of a computer with X10 controller software However, you need not utilize a computer to provide complex lighting scenes A lighting module (like the PCS In-Line Scene Lighting Module, shown in Figure 9-8) is used to control multiple lights with different preset dim levels Lighting modules come in inline or plug-in varieties

Figure 9-8

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