diff --git a/modules/testing/driver/kubetest.nix b/modules/testing/driver/kubetest.nix
index 72e1a0f..2da987c 100644
--- a/modules/testing/driver/kubetest.nix
+++ b/modules/testing/driver/kubetest.nix
@@ -22,10 +22,13 @@ let
     ''
     else t.script;
 
-  tests = builtins.trace testing pkgs.linkFarm "${testing.name}-tests" (map (t: {
-    path = toTestScript t;
-    name = "${t.name}_test.py";
-  }) testing.tests);
+  tests = pkgs.linkFarm "${testing.name}-tests" (
+    map (t: {
+      path = toTestScript t;
+      name = "${t.name}_test.py";
+    })
+    ( filter (t: t.script != null) testing.tests )
+  );
 
   testScript = pkgs.writeScript "test-${testing.name}.sh" ''
     #!/usr/bin/env bash
diff --git a/modules/testing/test-options.nix b/modules/testing/test-options.nix
index 24afdb3..8108c7f 100644
--- a/modules/testing/test-options.nix
+++ b/modules/testing/test-options.nix
@@ -50,6 +50,7 @@ in {
     script = mkOption {
       description = "Test script to use for e2e test";
       type = types.nullOr (types.either types.lines types.path);
+      default = null;
     };
 
   };