diff --git a/nixos/tests/sway.nix b/nixos/tests/sway.nix
index d700c63eae52..1e9e146c4b6c 100644
--- a/nixos/tests/sway.nix
+++ b/nixos/tests/sway.nix
@@ -123,6 +123,13 @@ import ./make-test-python.nix ({ pkgs, lib, ... }: {
     machine.wait_for_text("You pressed the exit shortcut.")
     machine.screenshot("sway_exit")
 
+    swaymsg("exec swaylock")
+    machine.wait_until_succeeds("pgrep -x swaylock")
+    machine.sleep(3)
+    machine.send_chars("${nodes.machine.config.users.users.alice.password}")
+    machine.send_key("ret")
+    machine.wait_until_fails("pgrep -x swaylock")
+
     # Exit Sway and verify process exit status 0:
     swaymsg("exit", succeed=False)
     machine.wait_until_fails("pgrep -x sway")