Better way to test multi-layered code?

add_tests("lasgn_call",
          "Rewriter"    => :same,
          "TypeChecker" => t(:lasgn, :c,
                             t(:call,
                               t(:lit, 2, Type.long),
                               :+,
                               t(:arglist,
                                 t(:lit, 3, Type.long)),
                               Type.long),
                             Type.long),
          "CRewriter"   => :same,
          "RubyToAnsiC" => "c = 2 + 3", # FIX: probably not "c = ..."
          "RubyToRubyC" => 'c = rb_funcall(LONG2NUM(2), rb_intern("+"), 1, LONG2NUM(3))')

Can you think of a better / cleaner way? This generates 5 test_lasgn_call methods in 5 different test classes. :same says "use previous output as my input", and Rewriter gets its input from ParseTree's test suite.

I've got 297 of these add_tests method calls. Gah. Just seems a bit much, but I can't really think of a better way ATM.