holo-daemon-modular-service: add test

nixos/tests/all-tests.nix

@@ -752,6 +752,7 @@ in
   hitch = handleTest ./hitch { };
   hledger-web = runTest ./hledger-web.nix;
   hockeypuck = runTest ./hockeypuck.nix;
+  holo-daemon-modular-service = runTest ./holo-daemon-modular.nix;
   home-assistant = runTest ./home-assistant.nix;
   homebox = runTest ./homebox.nix;
   homebridge = runTest ./homebridge.nix;

nixos/tests/holo-daemon-modular.nix

@@ -0,0 +1,66 @@
+{ ... }:
+{
+  _class = "nixosTest";
+  name = "holo-daemon-modular-service-test";
+
+  nodes = {
+    machine =
+      { pkgs, ... }:
+      {
+        environment.systemPackages = [
+          pkgs.holo-daemon
+          pkgs.holo-cli
+        ];
+        system.services.holo-daemon = {
+          imports = [ pkgs.holo-daemon.services.default ];
+        };
+        users.users.holo = {
+          isSystemUser = true;
+          group = "holo";
+          home = "/var/lib/holo";
+          createHome = true;
+        };
+        users.groups.holo = { };
+        services.getty.autologinUser = "root";
+      };
+  };
+
+  testScript =
+    { nodes, ... }:
+    ''
+      import time
+
+      start_all()
+
+      # holo-cli connects to the daemon at startup
+      # features a bash-like editing functionality for interactive use
+      # uses -c option to execute arguments as commands
+
+      machine.wait_for_unit("multi-user.target")
+
+      machine.wait_for_unit("holo-daemon.service")
+
+      machine.succeed("holo-cli -V")
+
+      # wait for cli to connect to the daemon
+      machine.wait_for_open_port(50051)
+
+      # Test the running configuration is empty
+      machine.succeed("holo-cli -c 'show running format json'")
+
+      # Configure an OSPFv3 instance:
+      # as seen in https://asciinema.org/a/qYxmDu1QjGPBAt5gNyNKvXhHk
+
+      machine.send_chars("holo-cli\n", 1)
+      time.sleep(5)
+      machine.send_chars("configure\n", 1)
+      machine.send_chars("routing control-plane-protocols control-plane-protocol ietf-ospf:ospfv3 main\n", 1)
+      machine.send_chars("ospf preference inter-area 50\n", 1)
+      machine.send_chars("show changes\n", 1)
+      machine.send_chars("commit\n", 1)
+      machine.send_chars("exit\n", 1)
+
+      # Verify the configuration was applied (in interactive test)
+      machine.succeed("test \"$(holo-cli -c 'show running format json')\" != \"{}\"");
+    '';
+}