Visual Foxpro is going to be a challenge, as most of the GUI interface objects are application owned and managed and are not standard MFC items. This poses a challenge for the majority of the tools on the market. One way around this is to build a specific VFP integration to expose the objects to the test tool. This is non-trivial and since the VFP market is not nearly as robust as it was when Microsoft "Merged" with Fox Software back in 1992, the odds of a manfacturer building a specific VFP library is likely small.
How can you test it? You can use "virtual" objects for many tools. Essentially friendly names for a bunch of analog operations. This is really akin to carving wood when all you have is an axe to work with. Gets the job done, buit places a whole lot more skill requirements in the hands of the carver.