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Format: Never trust data passed to your application. This is particularly applicable to any boundary methods, where you can get malicious hackers looking to crack your system. But poorly formatted data from any source can cause problems if you do not check it. Culture: Various tests need to be performed to ensure that cultural information is taken into account. In general, you can skip these tests if the application is written for a single culture only (although, even this is not a good indicator, because you can write a test for a U.S. English system but have it installed by someone in the U.K.). Otherwise, string, date, currency, and other types of values that can be localized should always be checked (for example, if you are expecting a date in the U.S. format but get it in the European format, then some values will work, but some will not). An example is the date 02/01/2000. In the U.S. format, this is February 1, 2000; in the European format, it is January 2, 2000. While this test would pass (most of the time), changing the U.S. format to 01/23/2000 would fail in the European format. Exception paths: Make sure that the application handles exceptions both expected and unexpected in the correct manner and in a secure fashion. Frequently, developers test the normal path and forget to test the exception path. VSTS includes a special process for testing the exception paths. Additionally, this will test how data is logged during a failure.

Other valid values are Cdecl, where the caller cleans the stack ThisCall, where the first parameter is the this pointer and is stored in the register ECX and other parameters are pushed on the stack winapi, where the default platform calling convention is used FastCall, which is not currently supported

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CharSet is an enumeration that defines how strings and characters are marshaled (handled). The default is Ansi. Other values are Unicode and Auto, which use the format appropriate for the platform. Normally, you should use Auto. Another feature of CharSet is it can be used to modify the name of the unmanaged function before it is looked up in the export list of the DLL. A number of Windows methods add an A for ANSI version and W for Unicode version to the end of the function name; for example, MessageBoxA and MessageBoxW. When you add the CharSet named parameter to the DllImportAttribute, the CLR s P/Invoke process appends the appropriate value for you. You saw this in action in Listing 23-3 and it explains why you used MessageBox and not MessageBoxA or MessageBoxW.

Not everything needs to be tested. In most cases, you want to test the most used paths of the appliTip cation for the most common scenarios. An example of wasted time would be writing tests for simple property assignments. While this may be needed in specific situations, you cannot possibly write every test for every scenario it takes too long even with VSTS!

The EntryPoint string value allows you to specify the name or ordinal number of the function within the DLL for which you create the prototype. When you don t specify an EntryPoint, then the CLR s P/Invoke process will use the name specified in the unmanaged function prototype. When you specify an EntryPoint value that differs from the unmanaged function prototype name, the EntryPoint takes precedence as the entry point into the DLL. This gives you the ability to rename the unmanaged function. For example, if you wanted the NativeCode.dll s square method to be renamed as Sqr you would code like this: [DllImportAttribute("NativeCode.dll", EntryPoint="square")] extern "C" long Sqr(long value);

Now it's time for VideoToyViewController.m, which is where the real work of managing the external screen happens. Synthesize the new properties, like this:

I told you earlier that the CharSet enumeration can modify the name of the unmanaged function. I said can because this functionality only occurs when ExactSpelling is set to false. The value false happens to be the default value of ExactSpelling, so you don t have to add the ExactSpelling named parameter when you want this functionality to occur. On the other hand, if you only want, let s say, the Unicode version of the unmanaged function to be used, you would need to set ExactSpelling to true and then specify an EntryPoint or prototype name with the W suffix, something like this: [DllImport("user32", CharSet=CharSet::Unicode, ExactSpelling=true)] extern "C" int MessageBoxW(int hWnd, String^ text, String^ caption, unsigned int type);

These five areas cover the majority of the situations you will run into when performing unit tests. Any plan should take into account tests that cover these areas of potential failure. Of course, this is by no means a comprehensive set of rules for unit testing. You will undoubtedly discover others related to your specific applications.

The purpose of PreserveSig is to override the default behavior of the unmanaged function s return value. When PreserveSig is set to true (which is the default), the return value works just as you would expect.

Note The unit testing areas listed here apply to the .NET platform. We have not included basic testing

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