Add one sanity check for missing device

Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

tests/00raid1

@@ -3,6 +3,10 @@
 # test version0, version1, and no super
 # test resync and recovery.
 
+# It's just a sanity check. This command shouldn't run successfully
+mdadm -CR $md0 -l 1 -n2 missing missing
+check opposite_result
+
 mdadm -CR $md0 -l 1 -n2 $dev0 $dev1
 check resync
 check raid1

tests/func.sh

@@ -219,6 +219,10 @@ do_setup() {
 # check various things
 check() {
 	case $1 in
+	opposite_result )
+		if [ $? -eq 0 ]; then
+			die "This command shouldn't run successfully"
+		fi
 	spares )
 		spares=$(tr '] ' '\012\012' < /proc/mdstat | grep -c '(S)' || exit 0)
 		[ $spares -ne $2 ] &&