1 files changed, 34 insertions, 0 deletions
diff --git a/nixpkgs/nixos/tests/switch-test.nix b/nixpkgs/nixos/tests/switch-test.nix
new file mode 100644
index 000000000000..0dba3697980f
--- /dev/null
+++ b/nixpkgs/nixos/tests/switch-test.nix
@@ -0,0 +1,34 @@
+# Test configuration switching.
+
+import ./make-test.nix ({ pkgs, ...} : {
+  name = "switch-test";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ gleber ];
+  };
+
+  nodes = {
+    machine = { ... }: {
+      users.mutableUsers = false;
+    };
+    other = { ... }: {
+      users.mutableUsers = true;
+    };
+  };
+
+  testScript = {nodes, ...}: let
+    originalSystem = nodes.machine.config.system.build.toplevel;
+    otherSystem = nodes.other.config.system.build.toplevel;
+
+    # Ensures failures pass through using pipefail, otherwise failing to
+    # switch-to-configuration is hidden by the success of `tee`.
+    stderrRunner = pkgs.writeScript "stderr-runner" ''
+      #! ${pkgs.stdenv.shell}
+      set -e
+      set -o pipefail
+      exec env -i "$@" | tee /dev/stderr
+    '';
+  in ''
+    $machine->succeed("${stderrRunner} ${originalSystem}/bin/switch-to-configuration test");
+    $machine->succeed("${stderrRunner} ${otherSystem}/bin/switch-to-configuration test");
+  '';
+})