WIP: NixOS test for geckodriver

nixos/tests/geckodriver.nix

@@ -0,0 +1,38 @@
+import ./make-test.nix {
+
+  machine =
+    { config, pkgs, ... }:
+    {
+      imports = [ ./common/x11.nix ];
+
+      environment.systemPackages = with pkgs; [
+        (
+          python3.withPackages(
+            ps : [
+              ps.selenium
+            ]
+          )
+        )
+        geckodriver
+        firefox
+      ];
+    };
+
+  testScript =
+    let
+      pythonScript =
+        ''
+        from selenium import webdriver
+
+        webdriver.Firefox()
+        '';
+    in
+      ''
+        $machine->waitForX;
+
+        subtest "selenium can launch Firefox", sub {
+            $machine->succeed("python3 -c '${pythonScript}'");
+            $machine->screenshot("Firefox");
+        };
+      '';
+}