traccar: init integration test

nixos/tests/all-tests.nix

@@ -1531,6 +1531,7 @@ in
   tor = runTest ./tor.nix;
   tpm-ek = handleTest ./tpm-ek { };
   tpm2 = runTest ./tpm2.nix;
+  traccar = runTest ./traccar.nix;
   # tracee requires bpf
   tracee = handleTestOn [ "x86_64-linux" ] ./tracee.nix { };
   traefik = runTestOn [ "aarch64-linux" "x86_64-linux" ] ./traefik.nix;

nixos/tests/traccar.nix

@@ -0,0 +1,51 @@
+{
+  pkgs,
+  lib,
+  ...
+}:
+{
+  name = "traccar";
+  meta = {
+    maintainers = with lib.maintainers; [ frederictobiasc ];
+  };
+  nodes.machine = {
+    services.traccar = {
+      enable = true;
+      settings.mail.smtp.host = "$SMTP_HOST";
+      environmentFile = pkgs.writeText "traccar.env" ''
+        SMTP_HOST=smtp.example.com
+      '';
+    };
+  };
+  testScript = ''
+    machine.wait_for_unit("traccar.service")
+
+    # Check that environment variables were substituted
+    t.assertIn("smtp.example.com", machine.succeed("cat /var/lib/traccar/config.xml"), "environment substitution failed")
+
+    machine.wait_for_open_port(8082)
+
+    # Check that we get the traccar login page
+    t.assertIn("Traccar", machine.wait_until_succeeds("curl -sf http://localhost:8082/"), "Traccar frontend seems unreachable")
+
+    # Register the first admin user
+    register_data = """
+    {
+        "email": "admin@example.com",
+        "name": "admin",
+        "password": "admin123"
+    }
+    """
+
+    t.assertIn(
+      "\"administrator\":true",
+      machine.succeed(
+        "curl -s -X POST "
+        "-H 'Content-Type: application/json' "
+        f"-d '{register_data}' "
+        "http://localhost:8082/api/users"
+      ),
+      "Unexpected registration response"
+    )
+  '';
+}