diff --git a/nixos/tests/frr.nix b/nixos/tests/frr.nix
index a975d4b402a1..f4cd68c9d315 100644
--- a/nixos/tests/frr.nix
+++ b/nixos/tests/frr.nix
@@ -5,10 +5,11 @@
 #
 # All interfaces are in OSPF Area 0.
 
-import ./make-test-python.nix ({ pkgs, ... }:
+import ./make-test-python.nix (
+  { pkgs, ... }:
   let
 
-    ifAddr = node: iface: (pkgs.lib.head node.config.networking.interfaces.${iface}.ipv4.addresses).address;
+    ifAddr = node: iface: (pkgs.lib.head node.networking.interfaces.${iface}.ipv4.addresses).address;
 
     ospfConf1 = ''
       router ospf
@@ -25,87 +26,94 @@ import ./make-test-python.nix ({ pkgs, ... }:
     '';
 
   in
-    {
-      name = "frr";
+  {
+    name = "frr";
 
-      meta = with pkgs.lib.maintainers; {
-        maintainers = [ ];
-      };
+    meta = with pkgs.lib.maintainers; {
+      maintainers = [ ];
+    };
 
-      nodes = {
+    nodes = {
 
-        client =
-          { nodes, ... }:
-          {
-            virtualisation.vlans = [ 1 ];
-            services.frr = {
-              config = ''
-                ip route 192.168.0.0/16 ${ifAddr nodes.router1 "eth1"}
-              '';
-            };
-          };
-
-        router1 =
-          { ... }:
-          {
-            virtualisation.vlans = [ 1 2 ];
-            boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
-            networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
-            services.frr = {
-              ospfd.enable = true;
-              config = ospfConf1;
-            };
-
-            specialisation.ospf.configuration = {
-              services.frr.config = ospfConf2;
-            };
-          };
-
-        router2 =
-          { ... }:
-          {
-            virtualisation.vlans = [ 3 2 ];
-            boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
-            networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
-            services.frr = {
-              ospfd.enable = true;
-              config = ospfConf2;
-            };
-          };
-
-        server =
-          { nodes, ... }:
-          {
-            virtualisation.vlans = [ 3 ];
-            services.frr = {
-              config = ''
-                ip route 192.168.0.0/16 ${ifAddr nodes.router2 "eth1"}
-              '';
-            };
-          };
-      };
-
-      testScript =
+      client =
         { nodes, ... }:
-        ''
-          start_all()
+        {
+          virtualisation.vlans = [ 1 ];
+          services.frr = {
+            config = ''
+              ip route 192.168.0.0/16 ${ifAddr nodes.router1 "eth1"}
+            '';
+          };
+        };
 
-          # Wait for the networking to start on all machines
-          for machine in client, router1, router2, server:
-              machine.wait_for_unit("network.target")
+      router1 =
+        { ... }:
+        {
+          virtualisation.vlans = [
+            1
+            2
+          ];
+          boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
+          networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
+          services.frr = {
+            ospfd.enable = true;
+            config = ospfConf1;
+          };
 
-          with subtest("Wait for FRR"):
-              for gw in client, router1, router2, server:
-                  gw.wait_for_unit("frr")
+          specialisation.ospf.configuration = {
+            services.frr.config = ospfConf2;
+          };
+        };
 
-          router1.succeed("${nodes.router1.config.system.build.toplevel}/specialisation/ospf/bin/switch-to-configuration test >&2")
+      router2 =
+        { ... }:
+        {
+          virtualisation.vlans = [
+            3
+            2
+          ];
+          boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
+          networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
+          services.frr = {
+            ospfd.enable = true;
+            config = ospfConf2;
+          };
+        };
 
-          with subtest("Wait for OSPF to form adjacencies"):
-              for gw in router1, router2:
-                  gw.wait_until_succeeds("vtysh -c 'show ip ospf neighbor' | grep Full")
-                  gw.wait_until_succeeds("vtysh -c 'show ip route' | grep '^O>'")
+      server =
+        { nodes, ... }:
+        {
+          virtualisation.vlans = [ 3 ];
+          services.frr = {
+            config = ''
+              ip route 192.168.0.0/16 ${ifAddr nodes.router2 "eth1"}
+            '';
+          };
+        };
+    };
 
-          with subtest("Test ICMP"):
-              client.wait_until_succeeds("ping -4 -c 3 server >&2")
-        '';
-    })
+    testScript =
+      { nodes, ... }:
+      ''
+        start_all()
+
+        # Wait for the networking to start on all machines
+        for machine in client, router1, router2, server:
+            machine.wait_for_unit("network.target")
+
+        with subtest("Wait for FRR"):
+            for gw in client, router1, router2, server:
+                gw.wait_for_unit("frr")
+
+        router1.succeed("${nodes.router1.system.build.toplevel}/specialisation/ospf/bin/switch-to-configuration test >&2")
+
+        with subtest("Wait for OSPF to form adjacencies"):
+            for gw in router1, router2:
+                gw.wait_until_succeeds("vtysh -c 'show ip ospf neighbor' | grep Full")
+                gw.wait_until_succeeds("vtysh -c 'show ip route' | grep '^O>'")
+
+        with subtest("Test ICMP"):
+            client.wait_until_succeeds("ping -4 -c 3 server >&2")
+      '';
+  }
+)