[cmake-developers] Allowed chars in test names

[Rolf Eike Beer]

Since d0170584c54b515b7eb2d044c3d48332523b3a37 there is a comment stating that 
"spaces, quotes, or other characters special in CMake syntax" are not allowed 
in a test name. This raised 2 topics:

-first: the only check done in add_test() is that the name is not empty. If 
there are forbidden characters we must test for them, reject everything that 
is invalid, and have a check that verifies that this works. I've been fooled 
at least twice myself when adding a test with a space in the name and then 
wondering why it didn't work.

-second: what does "special" mean? I fear that any test name would end up as 
some sort of target name in Makefile/project files somewhere, in which case we 
are limited to the valid subset of all supported generators. Which can be 
something like [a-zA-Z0-9_] with special rules like "must not start/end with 
$something". And maybe even some case problems?

So, who can shed some light on this? Brad?

Eike
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