diff --git a/tests/Kyuafile b/tests/Kyuafile
index ba56600..784a85b 100644
--- a/tests/Kyuafile
+++ b/tests/Kyuafile
@@ -4,3 +4,4 @@ test_suite('ifupdown-ng')
 
 atf_test_program{name='ifquery_test'}
 atf_test_program{name='ifup_test'}
+atf_test_program{name='ifdown_test'}
diff --git a/tests/ifdown_test b/tests/ifdown_test
new file mode 100755
index 0000000..2892347
--- /dev/null
+++ b/tests/ifdown_test
@@ -0,0 +1,78 @@
+#!/usr/bin/env atf-sh
+
+. $(atf_get_srcdir)/test_env.sh
+
+tests_init \
+	noargs \
+	lo_always_auto \
+	dual_stack \
+	static_ipv4 \
+	static_ipv6 \
+	inet_dhcp \
+	alias_eth0_home \
+	alias_eth0_work
+
+noargs_body() {
+	atf_check -s exit:1 -e ignore ifdown -S/dev/null
+}
+
+lo_always_auto_body() {
+	atf_check -s exit:0 -e ignore -o match:'ip link set down dev lo' \
+		ifdown -S/dev/null -i/dev/null -n -a
+}
+
+dual_stack_body() {
+	atf_check -s exit:0 -e ignore \
+		-o match:'ip link set down dev lo' \
+		-o match:'ip link set down dev eth0' \
+		-o match:'del 203.0.113.2/24 dev eth0' \
+		-o match:'del 2001:db8:1000:2::2/64 dev eth0' \
+		-o match:'default via 203.0.113.1' \
+		-o match:'default via 2001:db8:1000:2::1' \
+		ifdown -S/dev/null -i $FIXTURES/static-eth0.interfaces -n -a
+}
+
+static_ipv4_body() {
+	atf_check -s exit:0 -e ignore \
+		-o match:'ip link set down dev lo' \
+		-o match:'ip link set down dev eth0' \
+		-o match:'del 203.0.113.2/24 dev eth0' \
+		-o match:'default via 203.0.113.1' \
+		ifdown -S/dev/null -i $FIXTURES/static-eth0-v4.interfaces -n -a
+}
+
+static_ipv6_body() {
+	atf_check -s exit:0 -e ignore \
+		-o match:'ip link set down dev lo' \
+		-o match:'ip link set down dev eth0' \
+		-o match:'del 2001:db8:1000:2::2/64 dev eth0' \
+		-o match:'default via 2001:db8:1000:2::1' \
+		ifdown -S/dev/null -i $FIXTURES/static-eth0-v6.interfaces -n -a
+}
+
+inet_dhcp_body() {
+	atf_check -s exit:0 -e ignore \
+		-o match:'ip link set down dev lo' \
+		-o match:'ip link set down dev eth0' \
+		-o match:'dhc' \
+		ifdown -S/dev/null -i $FIXTURES/dhcp-eth0.interfaces -n -a
+}
+
+alias_eth0_home_body() {
+	atf_check -s exit:0 -e ignore \
+		-o match:'ip link set down dev eth0' \
+		-o match:'dhc' \
+		ifdown -S $FIXTURES/alias-home.ifstate \
+			-i $FIXTURES/alias-home-work.interfaces -n eth0
+}
+
+alias_eth0_work_body() {
+	atf_check -s exit:0 -e ignore \
+		-o match:'ip link set down dev eth0' \
+		-o match:'del 203.0.113.2/24 dev eth0' \
+		-o match:'del 2001:db8:1000:2::2/64 dev eth0' \
+		-o match:'default via 203.0.113.1' \
+		-o match:'default via 2001:db8:1000:2::1' \
+		ifdown -S $FIXTURES/alias-work.ifstate \
+			-i $FIXTURES/alias-home-work.interfaces -n eth0
+}