tests/int/checkpoint: require cgroupns

Otherwise the test will fail on e.g. CentOS 7.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

tests/integration/checkpoint.bats

@@ -72,7 +72,7 @@ function simple_cr() {
 
 @test "checkpoint and restore (cgroupns)" {
   # cgroupv2 already enables cgroupns so this case was tested above already
-  requires cgroups_v1
+  requires cgroups_v1 cgroupns
 
   # enable CGROUPNS
   update_config '.linux.namespaces += [{"type": "cgroup"}]'

tests/integration/helpers.bash

@@ -286,6 +286,11 @@ function requires() {
 				skip_me=1
 			fi
 			;;
+		cgroupns)
+			if [ ! -e "/proc/self/ns/cgroup" ]; then
+				skip_me=1
+			fi
+			;;
 		cgroups_v1)
 			init_cgroup_paths
 			if [ "$CGROUP_UNIFIED" != "no" ]; then