randomtest fixes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/busybox.tests

@@ -10,8 +10,9 @@ HELPDUMP=`true | busybox 2>&1 | cat`
 
 # We need to test under calling the binary under other names.
 
-
+optional SHOW_USAGE
 testing "busybox --help busybox" "true | busybox --help busybox 2>&1 | cat" "$HELPDUMP\n\n" "" ""
+SKIP=
 
 ln -s `which busybox` busybox-suffix
 for i in busybox ./busybox-suffix
@@ -26,11 +27,11 @@ do
 
 	testing "$i --help" "$i --help 2>&1" "$HELPDUMP\n\n" "" ""
 
-	optional CAT
+	optional SHOW_USAGE CAT
 	testing "" "$i cat" "moo" "" "moo"
 	testing "$i --help cat" "$i --help cat 2>&1 | grep print" \
 		"Concatenate FILEs and print them to stdout\n" "" ""
-	optional ""
+	SKIP=
 
 	testing "$i --help unknown" "$i --help unknown 2>&1" \
 		"unknown: applet not found\n" "" ""