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Another successful MBT implementation in use at Microsoft also simply uses the Common Language Runtime (CLR) for language and an engine to exercise the entire model graph at run time. The difference with Spec Explorer is that the engine, in this case, uses the CLR for execution, too. With this simple, yet powerful solution, testers can create models quickly. As in Spec Explorer, creating the models is similar to object-oriented programming with which most testers are familiar with using. Testers can work with multiple models, models can inherit from other models, models can nest, and models can call other models. Writing models feels like working with a programming language and feels natural for those who use it. There are no separate compilers or tools needed. Testers just write code using custom C# attributes to define the model behavior and run an execution engine to interpret those annotations. Because the models are based on annotations only, it is seamless to integrate modeled and nonmodeled tests. The teams using this particular modeling tool are able to model quickly on a small scale, and then grow the scope of their modeling while integrating with other, sequenced tests as needed. Listing 8-7 shows a model written in C# using attributes to describe the model, and Listing 8-8 shows code for a test that runs this model. Listing 8-7: Modeling with C# Attributes

// by StackWalk really exists. I've seen cases in which // StackWalk returns TRUE but the address doesn't belong to // a module in the process. dwModBase = SymGetModuleBase64 ( GetCurrentProcess ( ) g_stFrame.AddrPC.Offset ; if ( 0 == dwModBase ) { szRet = NULL ; __leave ; } int iCurr = 0 ; // At a minimum, put in the address. #ifdef _WIN64 iCurr += wsprintf ( g_szBuff + iCurr _T ( "0x%016X" ) g_stFrame.AddrPC.Offset #else iCurr += wsprintf ( g_szBuff + iCurr _T ( "%04X:%08X" ) g_stContext.SegCs g_stFrame.AddrPC.Offset #endif // Output the parameters if ( GSTSO_PARAMS == ( dwOpts & GSTSO_PARAMS ) ) { iCurr += wsprintf ( g_szBuff + iCurr k_PARAMFMTSTRING g_stFrame.Params[ 0 ] g_stFrame.Params[ 1 ] g_stFrame.Params[ 2 ] g_stFrame.Params[ 3 ] } // Output the module name. if ( GSTSO_MODULE == ( dwOpts & GSTSO_MODULE ) ) 489 , , , , , ) ; , , , ) ; , , ) ; , )

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The only difference here is that I ve added a call to FileStream s Dispose method. The Dispose method calls the Boolean Dispose method, which calls CloseHandle: Windows closes the file. Now, when File s Delete method is called, Windows sees that the file isn t open and successfully deletes it. Note that the FileStream object still exists in the managed heap, so you could still call methods on the object. Eventually, the garbage collector will run and the FileStream object will be determined to be garbage. At this point, the garbage collector would normally call its Finalize method, but because the Dispose method called GC s SuppressFinalize method, the Finalize method won t be called the object s memory will just be reclaimed. NoteThe previous code casts the fs variable to an IDisposable before calling Dispose. Most classes that implement the dispose pattern won t require this cast. However, for a FileStream object, the cast is required because Microsoft s developers implemented the Dispose method as an explicit interface method implementation (as described in 15). I felt that this was a poor decision because it just makes things more complex without adding any value. In general, you should use explicit interface method implementations only when you have multiple methods with the same name. Because Dispose and Close are different method names, I think that they should be publicly available and that no casting should be required. Because the FileStream class also offers a public Close method, the earlier code could be written as follows with identical results:

One of the easiest ways to add validation and business rules to your model is to use the DataAnnotations classes. Recall from 12 that these classes allow you to define required fields, acceptable values, formatting, and UI display information to your model. For example, the following attribute marks the CustomerId property as required in the data model.

Publishing the Remote Service Component To be usable in a distributed environment, a remotable class must be configured and exposed so that interested callers can reach it. A remotable object needs a running host application to handle any incoming calls. In addition, the object must specify what protocol, port, and name a potential client must use to issue its calls. All requirements that callers must fulfill are stored in the remote object's configuration file. 438

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