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POHow do I unit test for machine specific behaviour?
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copied!<p>I am testing a static method that builds a URL string after checking proxies and hostnames and all kinds of things. This method internally relies on the static flag <code>System.Net.Sockets.Socket.OSSupportsIPv6</code>. Because it's static, I cannot mock this dependency.</p> <p>EDIT: (This is simplified down a lot... I can't modify the structure of the method with the flag to accept a true/false).</p> <p>On XP development machines, the method under question returns a predictable string result (in this case, <a href="http://hostname/" rel="nofollow noreferrer">http://hostname/</a>.... ). Our build server, which support IPv6, returns a totally different result (it gives me something like <a href="http://192.168.0.1:80/..." rel="nofollow noreferrer">http://192.168.0.1:80/...</a>.). Please don't ask why - the point is that there are two different output types that vary on an operating system dependency.</p> <p>The test needs to validate that the returned hostname or IP address is valid. The outputs are easy to check. The problem is that I can only get one of the possible outputs, depending on which machine the test is run on.</p> <p>What's the best practice for writing the test in this case? Do I put an if statement in my test which checks the flag and then looks for the two different outputs? This seems sketchy to me because </p> <ol> <li><p>the test is behaving differently depending on the environment it's run in</p></li> <li><p>I'm basically coupling the test to the method, because you need to know the internals of the method to set up the two cases.</p></li> </ol> <p>Do I set up two tests, one for each environment, that simply pass if they're in the wrong environment? Do I write some complex regular expression that can separate out what kind of result it got and use more if/else logic to verify it?</p> <p>Any suggestions would help!</p>

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