diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 12f8954c4040..413736ab2544 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -925,6 +925,7 @@ in {
   swayfx = handleTest ./swayfx.nix {};
   switchTest = handleTest ./switch-test.nix { ng = false; };
   switchTestNg = handleTest ./switch-test.nix { ng = true; };
+  sx = handleTest ./sx.nix {};
   sympa = handleTest ./sympa.nix {};
   syncthing = handleTest ./syncthing.nix {};
   syncthing-no-settings = handleTest ./syncthing-no-settings.nix {};
diff --git a/nixos/tests/sx.nix b/nixos/tests/sx.nix
new file mode 100644
index 000000000000..1cdc4858cf00
--- /dev/null
+++ b/nixos/tests/sx.nix
@@ -0,0 +1,63 @@
+import ./make-test-python.nix (
+  { pkgs, lib, ... }:
+  {
+    name = "sx";
+    meta.maintainers = with lib.maintainers; [
+      figsoda
+      thiagokokada
+    ];
+
+    nodes.machine =
+      { ... }:
+      {
+        imports = [ ./common/user-account.nix ];
+
+        environment.systemPackages = with pkgs; [ icewm ];
+
+        services.getty.autologinUser = "alice";
+
+        services.xserver = {
+          enable = true;
+          displayManager.sx.enable = true;
+        };
+
+        # Create sxrc file on login and start sx
+        programs.bash.loginShellInit =
+          # bash
+          ''
+            mkdir -p "$HOME/.config/sx"
+            echo 'exec icewm' > "$HOME/.config/sx/sxrc"
+            chmod +x "$HOME/.config/sx/sxrc"
+
+            sx
+          '';
+      };
+
+    testScript =
+      { nodes, ... }:
+      let
+        user = nodes.machine.users.users.alice;
+      in
+      # python
+      ''
+        start_all()
+
+        machine.wait_for_unit("multi-user.target")
+
+        xauthority = "${user.home}/.local/share/sx/xauthority"
+        machine.wait_for_file(xauthority)
+        machine.succeed(f"xauth merge {xauthority}")
+
+        def icewm_is_visible(_last_try: bool) -> bool:
+            # sx will set DISPLAY as the TTY number we started, in this case
+            # TTY1:
+            # https://github.com/Earnestly/sx/blob/master/sx#L41.
+            # We can't use `machine.wait_for_window` here since we are running
+            # X as alice and not root.
+            return "IceWM" in machine.succeed("DISPLAY=:1 xwininfo -root -tree")
+
+        # Adding a retry logic to increase reliability
+        retry(icewm_is_visible)
+      '';
+  }
+)
diff --git a/pkgs/by-name/sx/sx/package.nix b/pkgs/by-name/sx/sx/package.nix
index 09e69728426f..5bbb60e52aba 100644
--- a/pkgs/by-name/sx/sx/package.nix
+++ b/pkgs/by-name/sx/sx/package.nix
@@ -5,6 +5,7 @@
   makeDesktopItem,
   patsh,
   xorg,
+  nixosTests,
 }:
 
 stdenvNoCC.mkDerivation (finalAttrs: {
@@ -40,7 +41,12 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     }/share/applications/sx.desktop
   '';
 
-  passthru.providedSessions = [ "sx" ];
+  passthru = {
+    providedSessions = [ "sx" ];
+    tests = {
+      inherit (nixosTests) sx;
+    };
+  };
 
   meta = {
     description = "Simple alternative to both xinit and startx for starting a Xorg server";