How do you validate your program transformations? In school I wrote a haskell to clojure translator that also does AST transforms (some of which unpack syntacti

How do you validate your program transformations? In school I wrote a haskell to clojure translator that also does AST transforms (some of which unpack syntactic sugar). However, my only way to validate the transforms was that the input program passe the "same" unit tests as the output program. Do you have any insight into this?