dev: add integration test

test/integration.nix

@@ -0,0 +1,58 @@
+{
+nixpkgs ? <nixpkgs>,
+pkgs ? import <nixpkgs> { inherit system; config = {}; },
+system ? builtins.currentSystem
+} @args:
+
+import "${nixpkgs}/nixos/tests/make-test-python.nix" ({ pkgs, ...}: {
+  name = "agenix-integration";
+
+  nodes.system1 = { config, lib, ... }: {
+
+    imports = [
+      ../modules/age.nix
+      ./install_ssh_host_keys.nix
+    ];
+
+    services.openssh.enable = true;
+
+    age.secrets.passwordfile-user1 = {
+      file = ../example/passwordfile-user1.age;
+    };
+
+    users = {
+      mutableUsers = false;
+
+      users = {
+        user1 = {
+          isNormalUser = true;
+          passwordFile = config.age.secrets.passwordfile-user1.path;
+        };
+      };
+    };
+
+  };
+
+  testScript =
+  let
+    user = "user1";
+    password = "password1234";
+  in ''
+    system1.wait_for_unit("multi-user.target")
+    system1.wait_until_succeeds("pgrep -f 'agetty.*tty1'")
+    system1.sleep(2)
+    system1.send_key("alt-f2")
+    system1.wait_until_succeeds(f"[ $(fgconsole) = 2 ]")
+    system1.wait_for_unit(f"getty@tty2.service")
+    system1.wait_until_succeeds(f"pgrep -f 'agetty.*tty2'")
+    system1.wait_until_tty_matches(2, "login: ")
+    system1.send_chars("${user}\n")
+    system1.wait_until_tty_matches(2, "login: ${user}")
+    system1.wait_until_succeeds("pgrep login")
+    system1.sleep(2)
+    system1.send_chars("${password}\n")
+    system1.send_chars("whoami > /tmp/1\n")
+    system1.wait_for_file("/tmp/1")
+    assert "${user}" in system1.succeed("cat /tmp/1")
+  '';
+}) args