add a testcase for reopened bug 585 (not fixed yet)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-redir/redir7.tests b/shell/ash_test/ash-redir/redir7.tests
index e9bedd0..17d1040 100755
--- a/shell/ash_test/ash-redir/redir7.tests
+++ b/shell/ash_test/ash-redir/redir7.tests
@@ -2,7 +2,9 @@
 # 0x81 is CTLESC (see ash.c).
 # The bug was that quoting and unquoting of them
 # was out of sync for redirect filenames.
-echo -e 'echo Ok >uni\x81code' >unicode.sh
+
+>unicode.sh
+echo -e 'echo Ok >uni\x81code' >>unicode.sh
 echo -e 'cat uni\x81code' >>unicode.sh
 echo -e 'cat uni?code' >>unicode.sh
 . unicode.sh