Better testing for random

kern/start.c

@@ -1,11 +1,11 @@
-#include <endian.h>
-#include <badrand.h>
-#include <hexdump.h>
 #include <assert.h>
+#include <badrand.h>
 #include <banner.h>
 #include <buddy.h>
 #include <config.h>
+#include <endian.h>
 #include <freelist.h>
+#include <hexdump.h>
 #include <memory.h>
 #include <panic.h>
 #include <proc.h>
@@ -100,8 +100,10 @@ void start() {
         }
         {
             char buffer[128];
+            memset(buffer, 0, 128);
+            assert(!looks_random(buffer, 128));
             badrand_buf(buffer, 128);
-            hexdump(buffer, 128);
+            assert(looks_random(buffer, 128));
         }
 
         kprintf("To exit qemu, press CTRL+a followed by x\n");