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Usually, when you introduce threads, you introduce coordination code that may require thread synchronization constructs to know when the other thread has terminated Once you start handling coordination, you are using even more resources and complicating your code So make sure that threads are really going to help you before you start using them You can use threads to get concurrent execution If and only if you know that your application is running on a machine with multiple CPUs in it, you can get improved performance by having multiple tasks executing simultaneously Today, machines with multiple CPUs in them are quite common, so designing your application to use multiple cores makes sense and is the focus of 26 and 27, I/O-Bound Asynchronous Operations ..

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/** Wraps another exeception. */ private NestedException(Throwable t) { super(); this.message = t.getMessage(); StringWriter out = new StringWriter(); t.printStackTrace(new PrintWriter(out)); this.stackTrace = out.toString(); } public String toString() { return this.getMessage(); } public String getMessage() { return this.message; } public void printStackTrace() { System.err.print(this.stackTrace); } public void printStackTrace(PrintStream out) { printStackTrace(new PrintWriter(out)); } public void printStackTrace(PrintWriter out) { out.print(this.stackTrace); } }

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Unit test should be fast One unit test should run in a fraction of a second with no delays and no time-expensive operations Each small piece of code should be tested in complete isolation, meaning the test shouldn t have any access to external resources It shouldn t write to the hard drive, nor should it require network connections If you have code that does that, you ll have to mock it as part of the test (We ll discuss mocks later in this chapter) To illustrate the suspicious-looking rule Let errors drive your unit tests, we ll revise a Samuel Beckett saying, Ever tried Ever failed No matter Fail again Fail better, and say Ever tried Ever failed No matter Try again Fail no more We strongly believe that when it comes to unit tests, you shouldn t fail more than once.

fewer number of tests as compared to random input testing. Microsoft has collected empirical data to show increases in both block and arc coverage of product code using pair-wise coverage as compared to a set of black box-designed tests, as illustrated in Table 5-6. The data also reveals additional increases in both block and arc coverage with sequential increases in n-wise coverage. Although increases in structural testing help reduce overall risk, this result comes with additional cost. Table 5-6: Testing effectiveness of Combinatorial Testing by increased Code Coverage Open table as spreadsheet Total block = 1,317 Manual tests Pair-wise tests n-3 coverage n-4 coverage Number of tests Block covered Code coverage 236 960 73% 136 979 74% 11 800 994 75% 10 3,533 1,006 76% 10

This means there s no excuse for not writing a test for every bug You should be doing error/defectdriven development Every time someone finds a bug in your code, you write a test for it, fix it, and let the test work from then on It ll function as a regression test in the future You ll be sure that particular bug is fixed for good, and your build will never again fail because of that bug Let s jump right in, take the financial library you ve worked with in earlier chapters, and create a simple unit test for it using NUnit and MSTest You ll integrate the tests with the CI servers To demonstrate the mocking of functionality in unit tests, you ll extend the financial calculator to perform some I/O operations that you can mock.

COM+ Services If you're building a COM+ service with the Active Template Library (ATL), you don't have to do anything with security By default, ATL runs as a user-mode executable until you register your application with the -Service command-line option ISAPI Filters and Extensions The exported functions you must provide for your filters and extensions are fairly simple, and you can easily write a test harness that acts as a fake IIS system You can test all your core algorithms in a controlled environment so that you have them completely debugged before you run your service under IIS proper Exchange Server You can build Exchange Server services that run as console applications if you use the helper functions in WINWRAPLIB Starting your service with the notserv startup parameter will force running as a normal process The notserv parameter must be the first parameter specified.

But before we get into mocking, you need some code to test, and you need to write some tests for the code..

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