diff --git a/test/test.nix b/test/test.nix
index 807c66e..fbc24c9 100644
--- a/test/test.nix
+++ b/test/test.nix
@@ -2,11 +2,6 @@
 
 { scenario ? "default" }:
 
-let
-  netns-isolation = builtins.getAttr scenario { default = false; withnetns = true; };
-  testScriptFilename = builtins.getAttr scenario { default = ./scenarios/default.py; withnetns = ./scenarios/withnetns.py; };
-in
-
 import ./make-test.nix rec {
   name = "nix-bitcoin-${scenario}";
 
@@ -23,7 +18,7 @@ import ./make-test.nix rec {
       # hardened
     ];
 
-    nix-bitcoin.netns-isolation.enable = mkForce netns-isolation;
+    nix-bitcoin.netns-isolation.enable = (scenario == "withnetns");
 
     services.bitcoind.extraConfig = mkForce "connect=0";
 
@@ -61,5 +56,7 @@ import ./make-test.nix rec {
       install -o nobody -g nogroup -m777 <(:) /secrets/dummy
     '';
   };
-  testScript = builtins.readFile ./scenarios/lib.py + "\n\n" + builtins.readFile testScriptFilename;
+  testScript =
+    builtins.readFile ./scenarios/lib.py + "\n\n" +
+    builtins.readFile "${./.}/scenarios/${scenario}.py";
 }