[develop-olympus] Backported 3.1 unit tests to 3.0.

Start adding unit tests for bugs you fix! Tests for anything are
welcome really. We have to work on these a lot.

tests/utf/utf8_clean_string_test.php

@@ -0,0 +1,32 @@
+<?php
+/**
+*
+* @package testing
+* @copyright (c) 2008 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+require_once 'test_framework/framework.php';
+require_once '../phpBB/includes/utf/utf_tools.php';
+
+class phpbb_utf_utf8_clean_string_test extends phpbb_test_case
+{
+	public static function cleanable_strings()
+	{
+		return array(
+			array('MiXed CaSe', 'mixed case', 'Checking case folding'),
+			array('  many   spaces   ', 'many spaces', 'Checking whitespace reduction'),
+			array("we\xC2\xA1rd\xE1\x9A\x80ch\xCE\xB1r\xC2\xADacters", 'weird characters', 'Checking confusables replacement'),
+		);
+	}
+
+	/**
+	* @dataProvider cleanable_strings
+	*/
+	public function test_utf8_clean_string($input, $output, $label)
+	{
+		$this->assertEquals($output, utf8_clean_string($input), $label);
+	}
+}
+