__t_printstr__ may not be available for tests

test/assert.rb

@@ -10,7 +10,7 @@ def t_print(*args)
   len = args.size
   while i < len
     str = args[i].to_s
-    __t_printstr__ str
+    __t_printstr__ str rescue print str
     i += 1
   end
 end