diff --git a/tests/mock/cache.php b/tests/mock/cache.php
index d3f9b8ad5a..989180c256 100644
--- a/tests/mock/cache.php
+++ b/tests/mock/cache.php
@@ -31,6 +31,28 @@ class phpbb_mock_cache implements phpbb_cache_driver_interface
 		$this->data[$var_name] = $var;
 	}
 
+	/**
+	 * Obtain list of word censors. We don't need to parse them here,
+	 * that is tested elsewhere.
+	 */
+	public function obtain_word_list()
+	{
+		return array(
+			'match'		=> array(
+				'#(?<![\\p{Nd}\\p{L}_-])([\\p{Nd}\\p{L}_-]*?badword1[\\p{Nd}\\p{L}_-]*?)(?![\\p{Nd}\\p{L}_-])#iu',
+				'#(?<![\\p{Nd}\\p{L}_-])([\\p{Nd}\\p{L}_-]*?badword2)(?![\\p{Nd}\\p{L}_-])#iu',
+				'#(?<![\\p{Nd}\\p{L}_-])(badword3[\\p{Nd}\\p{L}_-]*?)(?![\\p{Nd}\\p{L}_-])#iu',
+				'#(?<![\\p{Nd}\\p{L}_-])(badword4)(?![\\p{Nd}\\p{L}_-])#iu',
+			),
+			'replace'	=> array(
+				'replacement1',
+				'replacement2',
+				'replacement3',
+				'replacement4',
+			),
+		);
+	}
+
 	public function checkVar(PHPUnit_Framework_Assert $test, $var_name, $data)
 	{
 		$test->assertTrue(isset($this->data[$var_name]));
diff --git a/tests/mock_user.php b/tests/mock_user.php
index 74d31c4c4a..5b89ea3e19 100644
--- a/tests/mock_user.php
+++ b/tests/mock_user.php
@@ -17,4 +17,20 @@ class phpbb_mock_user
 {
 	public $host = "testhost";
 	public $page = array('root_script_path' => '/');
+	
+	private $options = array();
+	public function optionget($item)
+	{
+		if (!isset($this->options[$item]))
+		{
+			throw new Exception(sprintf("You didn't set the option '%s' on the mock user using optionset.", $item));
+		}
+		
+		return $this->options[$item];
+	}
+	
+	public function optionset($item, $value)
+	{
+		$this->options[$item] = $value;
+	}
 }
diff --git a/tests/text_processing/censor_text_test.php b/tests/text_processing/censor_text_test.php
new file mode 100644
index 0000000000..2843f0b20b
--- /dev/null
+++ b/tests/text_processing/censor_text_test.php
@@ -0,0 +1,85 @@
+<?php
+/**
+*
+* @package testing
+* @copyright (c) 2011 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+require_once dirname(__FILE__) . '/../../phpBB/includes/functions.php';
+require_once dirname(__FILE__) . '/../../phpBB/includes/functions_content.php';
+require_once dirname(__FILE__) . '/../mock_user.php';
+require_once dirname(__FILE__) . '/../mock/cache.php';
+
+class phpbb_text_processing_censor_text_test extends phpbb_test_case
+{
+	public function censor_text_data()
+	{
+		global $cache, $user;
+		$cache = new phpbb_mock_cache;
+		$user = new phpbb_mock_user;
+		
+		$user->optionset('viewcensors', false);
+
+		return array(
+			array('', ''),
+
+			array('badword1', 'replacement1'),
+			array(' badword1', ' replacement1'),
+			array('badword1 ', 'replacement1 '),
+			array(' badword1 ', ' replacement1 '),
+			array('abadword1', 'replacement1'),
+			array('badword1w', 'replacement1'),
+			array('abadword1w', 'replacement1'),
+			array('anotherbadword1test', 'replacement1'),
+			array('this badword1', 'this replacement1'),
+			array('this badword1 word', 'this replacement1 word'),
+
+			array('badword2', 'replacement2'),
+			array('bbadword2', 'replacement2'),
+			array('bbbadword2', 'replacement2'),
+			array('badword2d', 'badword2d'),
+			array('bbadword2d', 'bbadword2d'),
+			array('test badword2', 'test replacement2'),
+			array('test badword2 word', 'test replacement2 word'),
+
+			array('badword3', 'replacement3'),
+			array('bbadword3', 'bbadword3'),
+			array('badword3d', 'replacement3'),
+			array('badword3ddd', 'replacement3'),
+			array('bbadword3d', 'bbadword3d'),
+			array(' badword3 ', ' replacement3 '),
+			array(' badword3', ' replacement3'),
+
+			array('badword4', 'replacement4'),
+			array('this badword4 word', 'this replacement4 word'),
+			array('abadword4', 'abadword4'),
+			array('badword4d', 'badword4d'),
+			array('abadword4d', 'abadword4d'),
+
+			array('badword1 badword2 badword3 badword4', 'replacement1 replacement2 replacement3 replacement4'),
+			array('badword1 badword2 badword3 badword4d', 'replacement1 replacement2 replacement3 badword4d'),
+			array('abadword1 badword2 badword3 badword4', 'replacement1 replacement2 replacement3 replacement4'),
+			
+			array("new\nline\ntest", "new\nline\ntest"),
+			array("tab\ttest\t", "tab\ttest\t"),
+			array('öäü', 'öäü'),
+			array('badw' . chr(1) . 'ord1', 'badw' . chr(1) . 'ord1'),
+			array('badw' . chr(2) . 'ord1', 'badw' . chr(2) . 'ord1'),
+			array('badw' . chr(3) . 'ord1', 'badw' . chr(3) . 'ord1'),
+			array('badw' . chr(4) . 'ord1', 'badw' . chr(4) . 'ord1'),
+			array('badw' . chr(5) . 'ord1', 'badw' . chr(5) . 'ord1'),
+			array('badw' . chr(6) . 'ord1', 'badw' . chr(6) . 'ord1'),
+		);
+	}
+
+	/**
+	* @dataProvider censor_text_data
+	*/
+	public function test_censor_text($input, $expected)
+	{
+		$label = 'Testing word censor: ' . $input;
+		$this->assertEquals($expected, censor_text($input), $label);
+	}
+}