add tests for gunzip

diff --git a/archival/bbunzip_test2.sh b/archival/bbunzip_test2.sh
new file mode 100644
index 0000000..5b7e83e
--- /dev/null
+++ b/archival/bbunzip_test2.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+# Leak test for gunzip. Watch top for growing process size.
+
+# Just using urandom will make gzip use method 0 (store) -
+# not good for test coverage!
+
+cat /dev/urandom \
+| while true; do read junk; echo "junk $RANDOM $junk"; done \
+| ../busybox gzip \
+| ../busybox gunzip -c >/dev/null