Add a test for the location submodule: Addressing.

tests/addressing-smoke.nix

@@ -0,0 +1,36 @@
+let
+  lib = import <nixpkgs/lib> { };
+  addressing = import ./lib/addressing { inherit lib; };
+
+  spec = {
+    domain = "kasear.net";
+
+    locations = {
+      home = {
+        # note: owner/admins/users are *ignored* by mkNetworkFromSpec
+        owner = "yaro";
+        admins = [ "ops" ];
+
+        main = {
+          vlan = 10;
+          hosts = {
+            deimos = {
+              role = "server";
+              hostId = 1;
+            };
+
+            router = {
+              role = "router";
+              hostId = 1;
+            };
+          };
+        };
+      };
+    };
+  };
+
+  network = addressing.mkNetworkFromSpec spec;
+in
+{
+  inherit spec network;
+}