tests: add wireguard tests

tests/linux/Kyuafile

@@ -10,3 +10,4 @@ atf_test_program{name='vrf_test'}
 atf_test_program{name='ppp_test'}
 atf_test_program{name='tunnel_test'}
 atf_test_program{name='gre_test'}
+atf_test_program{name='wireguard_test'}

tests/linux/wireguard_test

@@ -0,0 +1,33 @@
+#!/usr/bin/env atf-sh
+
+. $(atf_get_srcdir)/../test_env.sh
+EXECUTOR="$(atf_get_srcdir)/../../executor-scripts/linux/wireguard"
+
+tests_init \
+	pre_up \
+	pre_up_specified_config \
+	post_down
+
+pre_up_body() {
+	export IFACE=wg0 PHASE=pre-up MOCK=echo
+	atf_check -s exit:0 \
+		-o match:'ip link add wg0 type wireguard' \
+		-o match:'wg setconf wg0 /etc/wireguard/wg0.conf' \
+		${EXECUTOR}
+}
+
+pre_up_specified_config_body() {
+	export IFACE=wg0 PHASE=pre-up MOCK=echo \
+		IF_WIREGUARD_CONFIG_PATH=/etc/wireguard/vpn.conf
+	atf_check -s exit:0 \
+		-o match:'ip link add wg0 type wireguard' \
+		-o match:'wg setconf wg0 /etc/wireguard/vpn.conf' \
+		${EXECUTOR}
+}
+
+post_down_body() {
+	export IFACE=wg0 PHASE=post-down MOCK=echo
+	atf_check -s exit:0 \
+		-o match:'ip link delete dev wg0' \
+		${EXECUTOR}
+}