diff --git a/tests/misc.nix b/tests/misc.nix
index 512d087168d..8501d6a0979 100644
--- a/tests/misc.nix
+++ b/tests/misc.nix
@@ -4,7 +4,11 @@
 
 {
 
-  machine = { config, pkgs, ... }: { };
+  machine =
+    { config, pkgs, ... }:
+    { swapDevices = pkgs.lib.mkOverride 0
+        [ { device = "/root/swapfile"; size = 128; } ];
+    };
 
   testScript =
     ''
@@ -23,6 +27,12 @@
       subtest "gmp", sub {
           $machine->succeed("expr 1 + 2");
       };
+
+      # Test that the swap file got created.
+      subtest "swapfile", sub {
+          $machine->waitUntilSucceeds("cat /proc/swaps | grep /root/swapfile");
+          $machine->succeed("ls -l /root/swapfile | grep 134217728");
+      };
     '';
 
 }