nixosTests.nano: replace with script using GNU expect

nixos/tests/all-tests.nix

@@ -322,7 +322,6 @@ in
   mysql-replication = handleTest ./mysql/mysql-replication.nix {};
   n8n = handleTest ./n8n.nix {};
   nagios = handleTest ./nagios.nix {};
-  nano = handleTest ./nano.nix {};
   nar-serve = handleTest ./nar-serve.nix {};
   nat.firewall = handleTest ./nat.nix { withFirewall = true; };
   nat.firewall-conntrack = handleTest ./nat.nix { withFirewall = true; withConntrackHelpers = true; };

nixos/tests/nano.nix

@@ -1,44 +0,0 @@
-import ./make-test-python.nix ({ pkgs, ...} : {
-  name = "nano";
-  meta = with pkgs.lib.maintainers; {
-    maintainers = [ nequissimus ];
-  };
-
-  machine = { lib, ... }: {
-    environment.systemPackages = [ pkgs.nano ];
-  };
-
-  testScript = { ... }: ''
-    start_all()
-
-    with subtest("Create user and log in"):
-        machine.wait_for_unit("multi-user.target")
-        machine.wait_until_succeeds("pgrep -f 'agetty.*tty1'")
-        machine.succeed("useradd -m alice")
-        machine.succeed("(echo foobar; echo foobar) | passwd alice")
-        machine.wait_until_tty_matches(1, "login: ")
-        machine.send_chars("alice\n")
-        machine.wait_until_tty_matches(1, "login: alice")
-        machine.wait_until_succeeds("pgrep login")
-        machine.wait_until_tty_matches(1, "Password: ")
-        machine.send_chars("foobar\n")
-        machine.wait_until_succeeds("pgrep -u alice bash")
-        machine.screenshot("prompt")
-
-    with subtest("Use nano"):
-        machine.send_chars("nano /tmp/foo")
-        machine.send_key("ret")
-        machine.sleep(2)
-        machine.send_chars("42")
-        machine.sleep(1)
-        machine.send_key("ctrl-x")
-        machine.sleep(1)
-        machine.send_key("y")
-        machine.sleep(1)
-        machine.screenshot("nano")
-        machine.sleep(1)
-        machine.send_key("ret")
-        machine.wait_for_file("/tmp/foo")
-        assert "42" in machine.succeed("cat /tmp/foo")
-  '';
-})

pkgs/applications/editors/nano/default.nix

@@ -1,5 +1,5 @@
 { lib, stdenv, fetchurl, fetchFromGitHub, ncurses, texinfo, writeScript
-, common-updater-scripts, git, nix, nixfmt, coreutils, gnused, nixosTests
+, common-updater-scripts, git, nix, nixfmt, coreutils, gnused, callPackage
 , gettext ? null, enableNls ? true, enableTiny ? false }:
 
 assert enableNls -> (gettext != null);
@@ -41,7 +41,9 @@ in stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   passthru = {
-    tests = { inherit (nixosTests) nano; };
+    tests = {
+      expect = callPackage ./test-with-expect.nix {};
+    };
 
     updateScript = writeScript "update.sh" ''
       #!${stdenv.shell}

pkgs/applications/editors/nano/test-with-expect.nix

@@ -0,0 +1,35 @@
+{ nano, expect, runCommand, writeScriptBin, runtimeShell }:
+
+let expect-script = writeScriptBin "expect-script" ''
+  #!${expect}/bin/expect -f
+
+  # Load nano
+  spawn nano file.txt
+  expect "GNU nano ${nano.version}"
+
+  # Add some text to the buffer
+  send "Hello world!"
+  expect "Hello world!"
+
+  # Send ctrl-x (exit)
+  send "\030"
+  expect "Save modified buffer?"
+
+  # Answer "yes"
+  send "y"
+  expect "File Name to Write"
+
+  # Send "return" to accept the file path.
+  send "\r"
+  sleep 1
+  exit
+''; in
+runCommand "nano-test-expect"
+{
+  nativeBuildInputs = [ nano expect ];
+  passthru = { inherit expect-script; };
+} ''
+  expect -f ${expect-script}/bin/expect-script
+  grep "Hello world!" file.txt
+  touch $out
+''