nixosTests.pcsclite: init

Add a small test to verify that the pcscd socket unit works, and that a
client can connect (which requires auto-starting pcscd.service).

nixos/tests/all-tests.nix

@@ -1227,6 +1227,7 @@ in
   pass-secret-service = runTest ./pass-secret-service.nix;
   password-option-override-ordering = runTest ./password-option-override-ordering.nix;
   patroni = handleTestOn [ "x86_64-linux" ] ./patroni.nix { };
+  pcsclite = runTest ./pcsclite.nix;
   pdns-recursor = runTest ./pdns-recursor.nix;
   peerflix = runTest ./peerflix.nix;
   peering-manager = runTest ./web-apps/peering-manager.nix;

nixos/tests/pcsclite.nix

@@ -0,0 +1,29 @@
+{
+  lib,
+  ...
+}:
+
+{
+  name = "pcsclite";
+  meta.maintainers = [ lib.maintainers.bjornfor ];
+
+  nodes = {
+    machine =
+      { pkgs, ... }:
+      {
+        environment.systemPackages = [
+          pkgs.pcsc-tools
+        ];
+        services.pcscd = {
+          enable = true;
+        };
+      };
+  };
+
+  testScript = ''
+    machine.wait_for_unit("pcscd.socket")
+
+    with subtest("client can connect"):
+        machine.succeed("pcsc_scan -r")
+  '';
+}