selftests: mptcp: userspace: refactor asserts

Instead of having a long list of conditions to check, it is possible to
give a list of variable names to compare with their 'e_XXX' version.

This will ease the introduction of the following commit which will print
which condition has failed (if any).
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

tools/testing/selftests/net/mptcp/userspace_pm.sh

@@ -225,6 +225,36 @@ make_connection()
 	fi
 }
 
+# $1: var name
+check_expected_one()
+{
+	local var="${1}"
+	local exp="e_${var}"
+
+	[ "${!var}" = "${!exp}" ]
+}
+
+# $@: all var names to check
+check_expected()
+{
+	local ret=0
+	local var
+
+	for var in "${@}"
+	do
+		check_expected_one "${var}" || ret=1
+	done
+
+	if [ ${ret} -eq 0 ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+		return 0
+	fi
+
+	stdbuf -o0 -e0 printf "[FAIL]\n"
+	exit 1
+}
+
 verify_announce_event()
 {
 	local evt=$1
@@ -250,15 +280,8 @@ verify_announce_event()
 	fi
 	dport=$(sed --unbuffered -n 's/.*\(dport:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
 	id=$(sed --unbuffered -n 's/.*\(rem_id:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
-	if [ "$type" = "$e_type" ] && [ "$token" = "$e_token" ] &&
-		   [ "$addr" = "$e_addr" ] && [ "$dport" = "$e_dport" ] &&
-		   [ "$id" = "$e_id" ]
-	then
-		stdbuf -o0 -e0 printf "[OK]\n"
-		return 0
-	fi
-	stdbuf -o0 -e0 printf "[FAIL]\n"
-	exit 1
+
+	check_expected "type" "token" "addr" "dport" "id"
 }
 
 test_announce()
@@ -357,14 +380,8 @@ verify_remove_event()
 	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
 	token=$(sed --unbuffered -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
 	id=$(sed --unbuffered -n 's/.*\(rem_id:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
-	if [ "$type" = "$e_type" ] && [ "$token" = "$e_token" ] &&
-		   [ "$id" = "$e_id" ]
-	then
-		stdbuf -o0 -e0 printf "[OK]\n"
-		return 0
-	fi
-	stdbuf -o0 -e0 printf "[FAIL]\n"
-	exit 1
+
+	check_expected "type" "token" "id"
 }
 
 test_remove()
@@ -519,16 +536,7 @@ verify_subflow_events()
 		daddr=$(sed --unbuffered -n 's/.*\(daddr4:\)\([0-9.]*\).*$/\2/p;q' "$evt")
 	fi
 
-	if [ "$type" = "$e_type" ] && [ "$token" = "$e_token" ] &&
-		   [ "$daddr" = "$e_daddr" ] && [ "$e_dport" = "$dport" ] &&
-		   [ "$family" = "$e_family" ] && [ "$saddr" = "$e_saddr" ] &&
-		   [ "$e_locid" = "$locid" ] && [ "$e_remid" = "$remid" ]
-	then
-		stdbuf -o0 -e0 printf "[OK]\n"
-		return 0
-	fi
-	stdbuf -o0 -e0 printf "[FAIL]\n"
-	exit 1
+	check_expected "type" "token" "daddr" "dport" "family" "saddr" "locid" "remid"
 }
 
 test_subflows()
@@ -881,15 +889,7 @@ verify_listener_events()
 			sed --unbuffered -n 's/.*\(saddr4:\)\([0-9.]*\).*$/\2/p;q')
 	fi
 
-	if [ $type ] && [ $type = $e_type ] &&
-	   [ $family ] && [ $family = $e_family ] &&
-	   [ $saddr ] && [ $saddr = $e_saddr ] &&
-	   [ $sport ] && [ $sport = $e_sport ]; then
-		stdbuf -o0 -e0 printf "[OK]\n"
-		return 0
-	fi
-	stdbuf -o0 -e0 printf "[FAIL]\n"
-	exit 1
+	check_expected "type" "family" "saddr" "sport"
 }
 
 test_listener()