[ticket/9801] Add viewonline_helper service to allow proper testing

The viewonline_helper service can and will be extended in the future which
will allow us to also test the viewonline page better.

PHPBB3-9801

tests/viewonline/helper_test.php

@@ -0,0 +1,42 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+class phpbb_viewonline_helper_test extends phpbb_test_case
+{
+	public function setUp()
+	{
+		parent::setUp();
+
+		$this->viewonline_helper = new \phpbb\viewonline_helper();
+	}
+
+	public function session_pages_data()
+	{
+		return array(
+			array('index.php', 'index.php'),
+			array('foobar/test.php', 'foobar/test.php'),
+			array('', ''),
+			array('../index.php', '../index.php'),
+		);
+	}
+
+	/**
+	* @dataProvider session_pages_data
+	*/
+	public function test_get_user_page($expected, $session_page)
+	{
+		$on_page = $this->viewonline_helper->get_user_page($session_page);
+		$this->assertArrayHasKey(1, $on_page);
+		$this->assertSame($expected, $on_page[1]);
+	}
+}