K.I.S.S. Assuming that your using standard IO for your input and output, your test scripts could do something like:
use Test::More ...;
system( 'perl zork.pl < testfile.1 >output.1' );
my $out = Slurp( 'output.1' );
my $expected = Slurp( 'expected.1' );
ok( $out eq $expected );
Substututing zork < testfile.1 > output.C.1 (C-version) or lisp zork.whatever? < testfile.1 >output.lisp.1 for the perl zork.pl in the system command allows you to run the same tests against all three versions.
Adding a debug option (to at least one version) that copies both the input and output to a separate files whilst the game is being played would allow you to generate your tests interactively with that version and then supply the input to the other versions and test their output was the same.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algoritm, algorithm on the code side." - tachyon
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