nixosTests.node-red: migrate to runTest

Part of #386873

nixos/tests/all-tests.nix

···
   };
   nixpkgs = pkgs.callPackage ../modules/misc/nixpkgs/test.nix { inherit evalMinimalConfig; };
   nixseparatedebuginfod = handleTest ./nixseparatedebuginfod.nix {};
-  node-red = handleTest ./node-red.nix {};
+  node-red = runTest ./node-red.nix;
   nomad = runTest ./nomad.nix;
   non-default-filesystems = handleTest ./non-default-filesystems.nix {};
   non-switchable-system = runTest ./non-switchable-system.nix;

nixos/tests/node-red.nix

···
-import ./make-test-python.nix (
-  { pkgs, ... }:
-  {
-    name = "nodered";
-    meta = with pkgs.lib.maintainers; {
-      maintainers = [ matthewcroughan ];
-    };
+{ pkgs, ... }:
+{
+  name = "nodered";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ matthewcroughan ];
+  };
 
-    nodes = {
-      client =
-        { config, pkgs, ... }:
-        {
-          environment.systemPackages = [ pkgs.curl ];
-        };
-      nodered =
-        { config, pkgs, ... }:
-        {
-          services.node-red = {
-            enable = true;
-            openFirewall = true;
-          };
+  nodes = {
+    client =
+      { config, pkgs, ... }:
+      {
+        environment.systemPackages = [ pkgs.curl ];
+      };
+    nodered =
+      { config, pkgs, ... }:
+      {
+        services.node-red = {
+          enable = true;
+          openFirewall = true;
         };
-    };
+      };
+  };
 
-    testScript = ''
-      start_all()
-      nodered.wait_for_unit("node-red.service")
-      nodered.wait_for_open_port(1880)
+  testScript = ''
+    start_all()
+    nodered.wait_for_unit("node-red.service")
+    nodered.wait_for_open_port(1880)
 
-      client.wait_for_unit("multi-user.target")
+    client.wait_for_unit("multi-user.target")
 
-      with subtest("Check that the Node-RED webserver can be reached."):
-          assert "<title>Node-RED</title>" in client.succeed(
-              "curl -sSf http:/nodered:1880/ | grep title"
-          )
-    '';
-  }
-)
+    with subtest("Check that the Node-RED webserver can be reached."):
+        assert "<title>Node-RED</title>" in client.succeed(
+            "curl -sSf http:/nodered:1880/ | grep title"
+        )
+  '';
+}