core/tests: Fix use of networking.interfaces.*.ip4

Since NixOS/nixpkgs@c1bed05e341756f7fdfa73035c7f1e078e49be3d it is now
called ipv4.addresses.

The reason why the evaluation on our behalf has failed despite the
option being aliased is that we try to access the option while checking
for eligible tests for a particular machine.

Signed-off-by: aszlig <aszlig@nix.build>

1 files changed, 2 insertions, 1 deletions

diff --git a/modules/core/tests.nix b/modules/core/tests.nix
index 2786a60a..f5093f0d 100644
--- a/modules/core/tests.nix
+++ b/modules/core/tests.nix
@@ -338,7 +338,8 @@ let
     { check = config.networking.sits != {};
       path  = ["nixos" "networking" whichNet "sit"];
     }
-    { check = anyAttrs (i: i.ip4 != []) config.networking.interfaces;
+    { check = anyAttrs (i: i.ipv4.addresses != [])
+              config.networking.interfaces;
       path  = ["nixos" "networking" whichNet "static"];
     }
     { check = config.networking.vlans != {};