Use `path.join` instead of `/`
Use `path.join` instead of `/`

TL;DR: paths are different on *nix and Windows systems. In order to
successfully run tests on both platforms, we should use
`path.join`.

asakusuma/ember-cli,jgwhite/ember-cli,mike-north/ember-cli,thoov/ember-cli,mike-north/ember-cli,jrjohnson/ember-cli,asakusuma/ember-cli,raycohen/ember-cli,mike-north/ember-cli,ember-cli/ember-cli,Turbo87/ember-cli,jgwhite/ember-cli,HeroicEric/ember-cli,jgwhite/ember-cli,balinterdi/ember-cli,fpauser/ember-cli,fpauser/ember-cli,HeroicEric/ember-cli,thoov/ember-cli,kategengler/ember-cli,elwayman02/ember-cli,HeroicEric/ember-cli,Turbo87/ember-cli,balinterdi/ember-cli,ember-cli/ember-cli,thoov/ember-cli,mike-north/ember-cli,fpauser/ember-cli,Turbo87/ember-cli,kategengler/ember-cli,buschtoens/ember-cli,raycohen/ember-cli,buschtoens/ember-cli,elwayman02/ember-cli,thoov/ember-cli,ember-cli/ember-cli,HeroicEric/ember-cli,fpauser/ember-cli,Turbo87/ember-cli,jgwhite/ember-cli,jrjohnson/ember-cli