How to run Test on multiple Os on TFS build ?

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Visual-Studio

WPF

testing

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Hello All ,
We have a WPF application Project which is suppose to run on different OS versions (Win XP ,Win 7 and Win 8 ). To make sure the compatibility of the application on all OS , We like to Run some unit test on All these OS versions On the TFS check-In .

Microsoft provide option to run unit test Using Test agent And Test Controller , but it share the test between machines and Run some test on some machines ( Ex : we have 2 Test agents and 10 Test then it run 5 test on each test agents ). Is any option to run all test on All machines . Any other ways ...??

we are using Windows 8 and TFS 2012 .

with regards,
jophy.