tests/integration: add tests for mount propagation flags

Signed-off-by: Dongsu Park <dpark@linux.microsoft.com>

tests/integration/mounts_propagation.bats

@@ -0,0 +1,36 @@
+#!/usr/bin/env bats
+
+load helpers
+
+function setup() {
+	requires root
+
+	setup_debian
+
+	mkdir -p rootfs/{proc,sys,tmp}
+	mkdir -p rootfs/tmp/mount1
+
+	update_config ' .mounts += [
+					{
+						"source": "tmpfs",
+						"destination": "/tmp/mount1",
+						"type": "tmpfs"
+					}
+				] '
+}
+
+function teardown() {
+	teardown_bundle
+}
+
+# https://github.com/opencontainers/runc/issues/1755
+@test "runc run [tmpfs mount propagation]" {
+	update_config ' .process.args = ["sh", "-c", "findmnt --noheadings -o PROPAGATION /tmp/mount1"]'
+	# Add the shared option to the mount
+	update_config ' .mounts |= map((select(.destination == "/tmp/mount1") | .options += ["shared"]) // .)'
+
+	runc run test_debian
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"shared"* ]]
+}
+