Maybe it's not really a bug, but expresso executable simply ignores unknown options what is especially weird with removing of common-used --include option.
This option used require.paths which was removed from node. You should consider switching your dependencies to be in the node_modules folder.
Yes, I understand it.
But it was unexpected for me to checkout project, install expresso, run tests and get weird errors from tests, but no from expresso, which simply ingnored unknown (by now) option without any notice.