nixos/whois: add test

nixos/tests/all-tests.nix

@@ -1745,6 +1745,7 @@ in
   wg-access-server = runTest ./wg-access-server.nix;
   whisparr = runTest ./whisparr.nix;
   whoami = runTest ./whoami.nix;
+  whois = runTest ./whois.nix;
   whoogle-search = runTest ./whoogle-search.nix;
   wiki-js = runTest ./wiki-js.nix;
   windmill = import ./windmill {

nixos/tests/whois.nix

@@ -0,0 +1,43 @@
+{ lib, ... }:
+{
+  name = "whois";
+  meta.maintainers = with lib.maintainers; [ Cryolitia ];
+
+  nodes.machine = {
+    imports = [ ../modules/profiles/minimal.nix ];
+
+    programs.whois = {
+      enable = true;
+      settings = [
+        {
+          pattern = "\\.dn42$";
+          server = "whois.dn42";
+        }
+        {
+          pattern = "\\-DN42$";
+          server = "whois.dn42";
+        }
+        {
+          pattern = "^as424242[0-9]{4}$";
+          server = "whois.dn42";
+        }
+      ];
+    };
+  };
+
+  testScript = ''
+    start_all()
+
+    machine.succeed("command -v whois")
+
+    whois_conf = machine.succeed("cat /etc/whois.conf").strip()
+    expected = """
+    # Generated by NixOS.
+    # See whois.conf(5) for the file format.
+    \\.dn42$ whois.dn42
+    \\-DN42$ whois.dn42
+    ^as424242[0-9]{4}$ whois.dn42
+    """.strip()
+    assert whois_conf == expected
+  '';
+}