test fix for expandedEnv - straight `to.equal` assertion was failing

since honk-cake uses its own exec.bin function to run the tests, by default already
adding the ./lib path twice.  bunch more yapping in the commit message

If at any point you're sick of pull requests on this, feel free to say "yo cheese.  I'm tired of these pull requests, cheese" and I'll maintain my own fork like, so fucking fast