diff --git a/tests/hello.nix b/tests/hello.nix
index c24085a..870c0eb 100644
--- a/tests/hello.nix
+++ b/tests/hello.nix
@@ -10,5 +10,6 @@
     start_all()
     machine1.wait_for_unit("sshd.service")
     machine1.succeed("hello")
+    machine1.fail("hello")
   '';
 }