You can place your class file anywhere in the Test Studio project folder. If your test project is at:
C:\My Test Projects\Test Project A
Place your file in the folder "Test Project A", or if you prefer to separate files, in a subfolder under it:
C:\My Test Projects\Test Project A\Utility Classes
Test Studio will automatically pick up and compile any/all source code files it finds when it builds the test project (the build happens automatically when you go to execute the test).
All the best,
the Telerik team
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