tests/checkpoint: add simple c/r test for cgroupns

Same test as the first one, just with cgroupns enabled.

Since in case of cgroupv2 `runc spec` enables cgroupns,
this case was already tested by the first checkpoint test,
so skip it.

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

tests/integration/checkpoint.bats

@@ -43,7 +43,7 @@ function check_pipes() {
 	[[ "${output}" == *"ponG Ping"* ]]
 }
 
-@test "checkpoint and restore" {
+function simple_cr() {
   runc run -d --console-socket $CONSOLE_SOCKET test_busybox
   [ "$status" -eq 0 ]
 
@@ -69,6 +69,20 @@ function check_pipes() {
   done
 }
 
+@test "checkpoint and restore " {
+	simple_cr
+}
+
+@test "checkpoint and restore (cgroupns)" {
+  # cgroupv2 already enables cgroupns so this case was tested above already
+  requires cgroups_v1
+
+  # enable CGROUPNS
+  sed -i 's|\("namespaces": \[\)|\1\n\t\t\t{"type": "cgroup"},|' config.json
+
+  simple_cr
+}
+
 @test "checkpoint --pre-dump and restore" {
   setup_pipes