diff --git a/nixos/tests/hostname.nix b/nixos/tests/hostname.nix
index 1de8f19267af..27265d195626 100644
--- a/nixos/tests/hostname.nix
+++ b/nixos/tests/hostname.nix
@@ -1,6 +1,6 @@
-{ system ? builtins.currentSystem,
-  config ? {},
-  pkgs ? import ../.. { inherit system config; }
+{ system ? builtins.currentSystem
+, config ? { }
+, pkgs ? import ../.. { inherit system config; }
 }:
 
 with import ../lib/testing-python.nix { inherit system pkgs; };
@@ -14,56 +14,56 @@ let
         let res = builtins.tryEval str;
         in if (res.success && res.value != null) then res.value else "null";
     in
-      makeTest {
-        name = "hostname-${fqdn}";
-        meta = with pkgs.lib.maintainers; {
-          maintainers = [ primeos blitz ];
-        };
-
-        nodes.machine = { lib, ... }: {
-          networking.hostName = hostName;
-          networking.domain = domain;
-
-          environment.systemPackages = with pkgs; [
-            inetutils
-          ];
-        };
-
-        testScript = { nodes, ... }: ''
-          start_all()
-
-          machine = ${hostName}
-
-          machine.wait_for_unit("network-online.target")
-
-          # Test if NixOS computes the correct FQDN (either a FQDN or an error/null):
-          assert "${getStr nodes.machine.config.networking.fqdn}" == "${getStr fqdnOrNull}"
-
-          # The FQDN, domain name, and hostname detection should work as expected:
-          assert "${fqdn}" == machine.succeed("hostname --fqdn").strip()
-          assert "${optionalString (domain != null) domain}" == machine.succeed("dnsdomainname").strip()
-          assert (
-              "${hostName}"
-              == machine.succeed(
-                  'hostnamectl status | grep "Static hostname" | cut -d: -f2'
-              ).strip()
-          )
-
-          # 127.0.0.1 and ::1 should resolve back to "localhost":
-          assert (
-              "localhost" == machine.succeed("getent hosts 127.0.0.1 | awk '{print $2}'").strip()
-          )
-          assert "localhost" == machine.succeed("getent hosts ::1 | awk '{print $2}'").strip()
-
-          # 127.0.0.2 should resolve back to the FQDN and hostname:
-          fqdn_and_host_name = "${optionalString (domain != null) "${hostName}.${domain} "}${hostName}"
-          assert (
-              fqdn_and_host_name
-              == machine.succeed("getent hosts 127.0.0.2 | awk '{print $2,$3}'").strip()
-          )
-        '';
+    makeTest {
+      name = "hostname-${fqdn}";
+      meta = with pkgs.lib.maintainers; {
+        maintainers = [ primeos blitz ];
       };
 
+      nodes.machine = { lib, ... }: {
+        networking.hostName = hostName;
+        networking.domain = domain;
+
+        environment.systemPackages = with pkgs; [
+          inetutils
+        ];
+      };
+
+      testScript = { nodes, ... }: ''
+        start_all()
+
+        machine = ${hostName}
+
+        machine.wait_for_unit("network-online.target")
+
+        # Test if NixOS computes the correct FQDN (either a FQDN or an error/null):
+        assert "${getStr nodes.machine.config.networking.fqdn}" == "${getStr fqdnOrNull}"
+
+        # The FQDN, domain name, and hostname detection should work as expected:
+        assert "${fqdn}" == machine.succeed("hostname --fqdn").strip()
+        assert "${optionalString (domain != null) domain}" == machine.succeed("dnsdomainname").strip()
+        assert (
+            "${hostName}"
+            == machine.succeed(
+                'hostnamectl status | grep "Static hostname" | cut -d: -f2'
+            ).strip()
+        )
+
+        # 127.0.0.1 and ::1 should resolve back to "localhost":
+        assert (
+            "localhost" == machine.succeed("getent hosts 127.0.0.1 | awk '{print $2}'").strip()
+        )
+        assert "localhost" == machine.succeed("getent hosts ::1 | awk '{print $2}'").strip()
+
+        # 127.0.0.2 should resolve back to the FQDN and hostname:
+        fqdn_and_host_name = "${optionalString (domain != null) "${hostName}.${domain} "}${hostName}"
+        assert (
+            fqdn_and_host_name
+            == machine.succeed("getent hosts 127.0.0.2 | awk '{print $2,$3}'").strip()
+        )
+      '';
+    };
+
 in
 {
   noExplicitDomain = makeHostNameTest "ahost" null null;