Added unit tests for Spec.__init__ exceptional paths
Added unit tests for Spec.__init__ exceptional paths

matthiasdiener/spack,krafczyk/spack,EmreAtes/spack,TheTimmy/spack,EmreAtes/spack,krafczyk/spack,lgarren/spack,iulian787/spack,krafczyk/spack,skosukhin/spack,EmreAtes/spack,LLNL/spack,EmreAtes/spack,LLNL/spack,mfherbst/spack,mfherbst/spack,skosukhin/spack,tmerrick1/spack,LLNL/spack,LLNL/spack,LLNL/spack,krafczyk/spack,matthiasdiener/spack,lgarren/spack,lgarren/spack,iulian787/spack,TheTimmy/spack,matthiasdiener/spack,tmerrick1/spack,iulian787/spack,TheTimmy/spack,krafczyk/spack,mfherbst/spack,mfherbst/spack,skosukhin/spack,mfherbst/spack,matthiasdiener/spack,iulian787/spack,EmreAtes/spack,lgarren/spack,TheTimmy/spack,lgarren/spack,matthiasdiener/spack,tmerrick1/spack,skosukhin/spack,skosukhin/spack,TheTimmy/spack,iulian787/spack,tmerrick1/spack,tmerrick1/spack