- [x] move some logic for handling virtual packages from the `spack dependencies` command into `spack.package.possible_dependencies()` - [x] rework possible dependencies tests so that expected and actual output are on the left/right respectively
- [x] move some logic for handling virtual packages from the `spack dependencies` command into `spack.package.possible_dependencies()` - [x] rework possible dependencies tests so that expected and actual output are on the left/right respectively