Fix unit tests running on Windows, broken in earlier commit.
Fix unit tests running on Windows, broken in earlier commit.

alexhersh/calico,alexaltair/calico,TrimBiggs/calico,Metaswitch/calico,Metaswitch/calico,alexaltair/calico,nbartos/calico,neiljerram/felix,neiljerram/felix,TrimBiggs/calico,beddari/calico,fasaxc/felix,anortef/calico,beddari/calico,fasaxc/felix,kasisnu/calico,alexhersh/calico,ocadotechnology/calico,kasisnu/calico,nbartos/calico,neiljerram/felix,anortef/calico,matthewdupre/felix,ocadotechnology/calico,neiljerram/felix,matthewdupre/felix