On MS Windows systems, the GUI tests were unable to complete without crashing. This is because each
GUI element requires one 'User object', and MS Windows has a maximum limit of 10,000 of these
objects. The GUI tests were taking more than 10,000 and then Windows would say - relax, you die
now.
The solution is that after each GUI test, all user function windows are destroyed. The user
function page is a wx.Panel object, so this requires a Destroy() call. But the window is a Uf_page
instance which inherits from Wiz_page which inherits from wx.Dialog. Calling Destroy() on MS
Windows and Linux works fine, but is fatal on Mac OS X systems. So the solution is to call Close()
instead.
