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This makes versioning an abstract-base class easier than versioning an interface because you can add a concrete member without making breaking changes Unlike interfaces, abstract class can have concrete members, which means a class can only inherit from one abstract class The abstract class syntax is exactly the same as the syntax for a class, except an abstract class can have abstract members To ensure that you haven t made a mistake in adding an abstract member that you didn t provide an implementation for, you need to make the abstract class with the [<AbstactClass>] attribute.

Refactor the code: The developers are responsible for refactoring the code. This is part of collective code ownership any developer can change any piece of code. When developers see code that needs to be refactored, they take the responsibility to do the work, instead of leaving it for someone else. Communicate with customers when questions arise: The developers are expected to communicate with the customers whenever questions about a story or task arise. When the developers have a question, they have a conversation with the customer. If the customer is not available, the developers will find answers elsewhere or assume an answer. In either case, the developer may come to the wrong conclusion. Use your customers and use them often. Also, don t forget that XP is a team effort. Communication needs to happen with the whole team, not just the customers.

def run(): pygame.init() screen = pygame.display.set_mode(SCREEN_SIZE, HWSURFACE|OPENGL|DOUBLEBUF)

The next example shows what your User example might look like if you were to choose to use an abstract class: // a abstract class that represents a user // it's constructor takes one parameters, // the user's name [<AbstractClass>] type User(name) = // the implmentation of this method should hashs the // users password and checks it against the known hash abstract Authenticate: evidence: string -> bool.

Static methods are like instance methods, except they are not specific to any instance of a class, so have no access to a class s fields To create a static method, you use the keyword static, followed by the keyword member Next, you include the method name, its parameters, an equals sign, and then the method definition This is basically the same as declaring an instance method, but with the addition of the keyword static and the removal of the parameter that represents the object Removing the parameter that represents the object is quite logical because the method has no access to the object s properties Static methods are useful for providing alternative ways of creating a new instance of an object F# provides no way of overloading class constructors, so you provide a static method that calls the class s constructor.

resize(*SCREEN_SIZE) init() # Upload the background and fugu texture background_tex = upload_texture('background.png') fugu_tex = upload_texture('fugu.png', True) while True: for event in pygame.event.get(): if event.type == QUIT: return if event.type == KEYDOWN: if event.key == K_1: # Simple alpha blending glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) glBlendEquation(GL_FUNC_ADD) elif event.key == K_2: # Additive alpha blending glBlendFunc(GL_SRC_ALPHA, GL_ONE) glBlendEquation(GL_FUNC_ADD) elif event.key == K_3: # Subtractive blending glBlendFunc(GL_SRC_ALPHA, GL_ONE) glBlendEquation(GL_FUNC_REVERSE_SUBTRACT) glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) # Draw the background glBindTexture(GL_TEXTURE_2D, background_tex) # Draw the background texture to the screen glDisable(GL_BLEND) draw_quad(0, 0, -SCREEN_SIZE[1], 600, 600) glEnable(GL_BLEND) # Draw a texture at the mouse position glBindTexture(GL_TEXTURE_2D, fugu_tex) x, y = pygame.mouse.get_pos() x -= SCREEN_SIZE[0]/2 y -= SCREEN_SIZE[1]/2 draw_quad(x, -y, -SCREEN_SIZE[1], 256, 256) pygame.display.flip()

As you build up unit tests, the goal is to have 100 percent of the application tested from a functional level. With this type of unit test coverage, any developer who needs to modify the application will be able to do so with greater confidence. Developers know that if their changes adversely affect the application, the unit tests will start failing. A key point to remember is to always make changes in small increments. This is important because if you should introduce a bug, you want to have the smallest amount of code to look through to find the bug. If you make many changes at once, you will increase the amount of places and code you will need to look through to find the bug. In this chapter, you will work through an example of building a unit test. If you have not yet followed the instructions in Appendix A, follow the steps in the next section to install NUnit.