--- /dev/null
+#! /bin/sh
+set -e
+rm -f testfile
+./vbig --seed chahthaiquiyouto --create testfile 65536
+dd if=/dev/zero of=testfile bs=256 count=1 seek=1 conv=nocreat,notrunc oflag=append status=none
+if ./vbig --seed chahthaiquiyouto --verify testfile 65536 2>testoutput; then
+ echo >&2 ERROR: verify unexpectedly succeeded
+ exit 1
+fi
+echo 'ERROR: testfile: extended beyond 65536 bytes' > testexpect
+diff -u testexpect testoutput
+rm -f testfile testoutput testexpect