test/system: Test that interprocess communication works

Note that 'run --keep-empty-lines' counts the trailing newline on the
last line as a separate line.

https://github.com/containers/toolbox/pull/1326

test/system/201-ipc.bats

@@ -0,0 +1,46 @@
+# shellcheck shell=bats
+#
+# Copyright © 2023 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load 'libs/bats-support/load'
+load 'libs/bats-assert/load'
+load 'libs/helpers'
+
+setup() {
+  bats_require_minimum_version 1.7.0
+  _setup_environment
+  cleanup_containers
+}
+
+teardown() {
+  cleanup_containers
+}
+
+@test "ipc: no namespace" {
+  local ns_host
+  ns_host=$(readlink /proc/$$/ns/ipc)
+
+  create_default_container
+
+  run --keep-empty-lines --separate-stderr "$TOOLBOX" run sh -c 'readlink /proc/$$/ns/ipc'
+
+  assert_success
+  assert_line --index 0 "$ns_host"
+  assert [ ${#lines[@]} -eq 2 ]
+
+  # shellcheck disable=SC2154
+  assert [ ${#stderr_lines[@]} -eq 0 ]
+}

test/system/meson.build

@@ -1,4 +1,5 @@
 test_system = files(
+  '201-ipc.bats',
   '203-network.bats',
 )