Merge pull request #238848 from nikstur/qemu-vm-volatile-root

nixos/tests/qemu-vm-volatile-root: init

nixos/tests/all-tests.nix

@@ -646,6 +646,7 @@ in {
   pulseaudio = discoverTests (import ./pulseaudio.nix);
   qboot = handleTestOn ["x86_64-linux" "i686-linux"] ./qboot.nix {};
   qemu-vm-restrictnetwork = handleTest ./qemu-vm-restrictnetwork.nix {};
+  qemu-vm-volatile-root = runTest ./qemu-vm-volatile-root.nix;
   quorum = handleTest ./quorum.nix {};
   quake3 = handleTest ./quake3.nix {};
   qownnotes = handleTest ./qownnotes.nix {};

nixos/tests/qemu-vm-volatile-root.nix

@@ -0,0 +1,17 @@
+# Test that the root filesystem is a volatile tmpfs.
+
+{ lib, ... }:
+
+{
+  name = "qemu-vm-volatile-root";
+
+  meta.maintainers = with lib.maintainers; [ nikstur ];
+
+  nodes.machine = _: {
+    virtualisation.diskImage = null;
+  };
+
+  testScript = ''
+    machine.succeed("findmnt --kernel --types tmpfs /")
+  '';
+}