--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use JSON qw(from_json);
+use Test::More;
+
+use Proxmox::Log;
+use Proxmox::UI;
+
+pipe(my $parent_reader, my $child_writer) || die;
+pipe(my $child_reader, my $parent_writer) || die;
+
+$parent_writer->autoflush(1);
+$child_writer->autoflush(1);
+$child_reader->autoflush(1);
+
+
+if (my $child_pid = fork()) {
+ # parent, the hypothetical low-level installer
+ close($parent_reader);
+ close($parent_writer);
+
+ # "mock" stdin and stdout for Proxmox::UI::StdIO
+ *STDIN = $child_reader;
+ *STDOUT = $child_writer;
+
+ Proxmox::Log::init('&STDERR'); # log to stderr
+ Proxmox::UI::init_stdio({}, {});
+
+ Proxmox::UI::message('foo');
+ Proxmox::UI::error('bar');
+ is(Proxmox::UI::prompt('baz?'), 1, 'prompt should get positive answer');
+ is(Proxmox::UI::prompt('not baz? :('), '', 'prompt should get negative answer');
+
+ Proxmox::UI::finished(1, 'install successful');
+ Proxmox::UI::finished(0, 'install failed');
+
+ Proxmox::UI::progress(0.2, 0, 1, '20% done');
+ Proxmox::UI::progress(0.2, 0, 1);
+ Proxmox::UI::progress(0.99, 0, 1, '99% done');
+ Proxmox::UI::progress(1, 0, 1, 'done');
+
+ waitpid($child_pid, 0);
+ done_testing();
+} else {
+ # child, e.g. the TUI
+ die 'failed to fork?' if !defined($child_pid);
+ close($child_reader);
+ close($child_writer);
+
+ use Test::More;
+
+ my $next_msg = sub {
+ chomp(my $msg = <$parent_reader>);
+ return from_json($msg, { utf8 => 1 });
+ };
+
+ is_deeply(&$next_msg(), { type => 'message', message => 'foo' }, 'should receive message');
+ is_deeply(&$next_msg(), { type => 'error', message => 'bar' }, 'should receive error');
+
+ is_deeply(&$next_msg(), { type => 'prompt', query => 'baz?' }, 'prompt works');
+ print $parent_writer "{\"type\":\"prompt-answer\",\"answer\":\"ok\"}\n";
+
+ is_deeply(&$next_msg(), { type => 'prompt', query => 'not baz? :(' }, 'prompt works');
+ print $parent_writer "{\"type\":\"prompt-answer\",\"answer\":\"cancel\"}\n";
+
+ is_deeply(
+ &$next_msg(), { type => 'finished', state => 'ok', message => 'install successful'},
+ 'should receive successful finished message');
+
+ is_deeply(
+ &$next_msg(), { type => 'finished', state => 'err', message => 'install failed'},
+ 'should receive failed finished message');
+
+ is_deeply(
+ &$next_msg(), { type => 'progress', ratio => 0.2, text => '20% done' },
+ 'should get 20% done progress message');
+
+ is_deeply(
+ &$next_msg(), { type => 'progress', ratio => 0.2, text => '' },
+ 'should get progress continuation message');
+
+ is_deeply(
+ &$next_msg(), { type => 'progress', ratio => 0.99, text => '99% done' },
+ 'should get 99% done progress message');
+
+ is_deeply(
+ &$next_msg(), { type => 'progress', ratio => 1, text => 'done' },
+ 'should get 100% done progress message');
+
+ done_testing();
+ exit(0);
+}
+