Tests expect a specific (shortest I believe?) sequence, while
the description implies any valid transformation goes:

The task is to find a sequence of transformations

A valid transformation sequence from "hit" to "cog" can be: ...

• In solution setup provides a function with a different name than expected by tests.
• there is no random tests.

Suggestions:

• The dotest in its current form is a very thin wrapper which does not provide much value. It would be more useful if it did something more, for example present a useful failure message helpful for debugging.

Please see LUA translations of kata from this collection for some ideas.