Failing test at runtime

[François Dumont]

Hello

    In order to validate a patch I will submit soon I hope, I am trying 
to write some tests. I would like to check that in debug mode, invalid 
code is correctly detected. I plan to use _neg.cc tests but for the 
moment I failed to write them. The question is: what is a failing test ? 
Is invalid code detected by the debug mode will be considered as an 
invalid test ? For the moment I only see compile time failing tests, are 
running time failing tests supported too ?

Thanks