[Openal] Verify device closed

[David Guthrie]

I'm trying to verify that a device and a context are being closed/ 
destroyed as part of a unit test.   I can't seem to find a way that  
works on all implementations.  The best I can tell with the context is  
to try to make it current and see if it returns NULL.  It seems like I  
should get an error in that case, but I don't always, and trying to  
destroy it should fail because it's destroyed already.

With the device, if I try to destroy the device again, it returns  
false in some implementations, but in others it crashes.

I know this is like trying to verify that memory has been deleted,  
although we do that with reference counted pointers, but does anyone  
have any ideas?

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David Guthrie
dguthrie at alionscience.com
Alion Science and Technology
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