Well, there’s the approach I took with ZILF’s integration tests, which you can see as Zilf.Tests.Integration in the ZILF repo.
But before automated tests, I’d suggest trying some manual tests. Compile the game, play it, and see how far you can get. Walkthroughs are easy to find on Google.
That’s what I did to test Zork I for Glulx - I don’t have automated tests for Glulx yet, so I found a walkthrough and iterated on the compiler until I could make it to the end of the game without any crashes or bugs.