diff --git a/phpBB/includes/cache/driver/redis.php b/phpBB/includes/cache/driver/redis.php
index d256b5600e..960735b673 100644
--- a/phpBB/includes/cache/driver/redis.php
+++ b/phpBB/includes/cache/driver/redis.php
@@ -39,13 +39,39 @@ class phpbb_cache_driver_redis extends phpbb_cache_driver_memory
 
 	var $redis;
 
+	/**
+	* Creates a redis cache driver.
+	*
+	* The following global constants affect operation:
+	*
+	* PHPBB_ACM_REDIS_HOST
+	* PHPBB_ACM_REDIS_PORT
+	* PHPBB_ACM_REDIS_PASSWORD
+	* PHPBB_ACM_REDIS_DB
+	*
+	* There are no publicly documented constructor parameters.
+	*/
 	function __construct()
 	{
 		// Call the parent constructor
 		parent::__construct();
 
 		$this->redis = new Redis();
-		$this->redis->connect(PHPBB_ACM_REDIS_HOST, PHPBB_ACM_REDIS_PORT);
+
+		$args = func_get_args();
+		if (!empty($args))
+		{
+			$ok = call_user_func_array(array($this->redis, 'connect'), $args);
+		}
+		else
+		{
+			$ok = $this->redis->connect(PHPBB_ACM_REDIS_HOST, PHPBB_ACM_REDIS_PORT);
+		}
+
+		if (!$ok)
+		{
+			trigger_error('Could not connect to redis server');
+		}
 
 		if (defined('PHPBB_ACM_REDIS_PASSWORD'))
 		{
diff --git a/tests/RUNNING_TESTS.txt b/tests/RUNNING_TESTS.txt
index 7c2a7c3fce..75a6fc94f6 100644
--- a/tests/RUNNING_TESTS.txt
+++ b/tests/RUNNING_TESTS.txt
@@ -72,6 +72,21 @@ to connect to that database in phpBB.
 Additionally, you will need to be running the DbUnit fork from
 https://github.com/phpbb/dbunit/tree/phpbb.
 
+Redis
+-----
+
+In order to run tests for the Redis cache driver, at least one of Redis host
+or port must be specified in test configuration. This can be done via
+test_config.php as follows:
+
+    <?php
+    $phpbb_redis_host = 'localhost';
+    $phpbb_redis_port = 6379;
+
+Or via environment variables as follows:
+
+    $ PHPBB_TEST_REDIS_HOST=localhost PHPBB_TEST_REDIS_PORT=6379 phpunit
+
 Running
 =======
 
diff --git a/tests/cache/apc_driver_test.php b/tests/cache/apc_driver_test.php
new file mode 100644
index 0000000000..c8b8f82b67
--- /dev/null
+++ b/tests/cache/apc_driver_test.php
@@ -0,0 +1,91 @@
+<?php
+/**
+*
+* @package testing
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+// Important: apc.enable_cli=1 must be in php.ini.
+// http://forums.devshed.com/php-development-5/apc-problem-561290.html
+// http://php.net/manual/en/apc.configuration.php
+
+require_once dirname(__FILE__) . '/common_test_case.php';
+
+class phpbb_cache_apc_driver_test extends phpbb_cache_common_test_case
+{
+	protected static $config;
+	protected $driver;
+
+	public function getDataSet()
+	{
+		return $this->createXMLDataSet(dirname(__FILE__) . '/fixtures/config.xml');
+	}
+
+	static public function setUpBeforeClass()
+	{
+		if (!extension_loaded('apc'))
+		{
+			self::markTestSkipped('APC extension is not loaded');
+		}
+
+		$php_ini = new phpbb_php_ini;
+
+		if (!$php_ini->get_bool('apc.enabled'))
+		{
+			self::markTestSkipped('APC is not enabled. Make sure apc.enabled=1 in php.ini');
+		}
+
+		if (PHP_SAPI == 'cli' && !$php_ini->get_bool('apc.enable_cli'))
+		{
+			self::markTestSkipped('APC is not enabled for CLI. Set apc.enable_cli=1 in php.ini');
+		}
+	}
+
+	protected function setUp()
+	{
+		parent::setUp();
+
+		$this->driver = new phpbb_cache_driver_apc;
+		$this->driver->purge();
+	}
+
+	public function test_cache_sql()
+	{
+		global $db, $cache;
+		$db = $this->new_dbal();
+		$cache = new phpbb_cache_service($this->driver);
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+
+		$key = $this->driver->key_prefix . 'sql_' . md5(preg_replace('/[\n\r\s\t]+/', ' ', $sql));
+		$this->assertFalse(apc_fetch($key));
+
+		$result = $db->sql_query($sql, 300);
+		$first_result = $db->sql_fetchrow($result);
+		$expected = array('config_name' => 'foo', 'config_value' => '23', 'is_dynamic' => 0);
+		$this->assertEquals($expected, $first_result);
+
+		$this->assertTrue((bool) apc_fetch($key));
+
+		$sql = 'DELETE FROM phpbb_config';
+		$result = $db->sql_query($sql);
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+		$result = $db->sql_query($sql, 300);
+
+		$this->assertEquals($expected, $db->sql_fetchrow($result));
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+		$result = $db->sql_query($sql);
+
+		$no_cache_result = $db->sql_fetchrow($result);
+		$this->assertSame(false, $no_cache_result);
+
+		$db->sql_close();
+	}
+}
diff --git a/tests/cache/common_test_case.php b/tests/cache/common_test_case.php
new file mode 100644
index 0000000000..45cf80e424
--- /dev/null
+++ b/tests/cache/common_test_case.php
@@ -0,0 +1,64 @@
+<?php
+/**
+*
+* @package testing
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+abstract class phpbb_cache_common_test_case extends phpbb_database_test_case
+{
+	public function test_get_put_exists()
+	{
+		$this->assertFalse($this->driver->_exists('test_key'));
+		$this->assertSame(false, $this->driver->get('test_key'));
+
+		$this->driver->put('test_key', 'test_value');
+
+		$this->assertTrue($this->driver->_exists('test_key'));
+		$this->assertEquals(
+			'test_value',
+			$this->driver->get('test_key'),
+			'File ACM put and get'
+		);
+	}
+
+	public function test_purge()
+	{
+		$this->driver->put('test_key', 'test_value');
+
+		$this->assertEquals(
+			'test_value',
+			$this->driver->get('test_key'),
+			'File ACM put and get'
+		);
+
+		$this->driver->purge();
+
+		$this->assertSame(false, $this->driver->get('test_key'));
+	}
+
+	public function test_destroy()
+	{
+		$this->driver->put('first_key', 'first_value');
+		$this->driver->put('second_key', 'second_value');
+
+		$this->assertEquals(
+			'first_value',
+			$this->driver->get('first_key')
+		);
+		$this->assertEquals(
+			'second_value',
+			$this->driver->get('second_key')
+		);
+
+		$this->driver->destroy('first_key');
+
+		$this->assertFalse($this->driver->_exists('first_key'));
+		$this->assertEquals(
+			'second_value',
+			$this->driver->get('second_key')
+		);
+	}
+}
diff --git a/tests/cache/cache_test.php b/tests/cache/file_driver_test.php
similarity index 57%
rename from tests/cache/cache_test.php
rename to tests/cache/file_driver_test.php
index 285af5cd0c..2353940277 100644
--- a/tests/cache/cache_test.php
+++ b/tests/cache/file_driver_test.php
@@ -7,11 +7,12 @@
 *
 */
 
-require_once dirname(__FILE__) . '/../../phpBB/includes/functions.php';
+require_once dirname(__FILE__) . '/common_test_case.php';
 
-class phpbb_cache_test extends phpbb_database_test_case
+class phpbb_cache_file_driver_test extends phpbb_cache_common_test_case
 {
 	private $cache_dir;
+	protected $driver;
 
 	public function __construct()
 	{
@@ -34,6 +35,8 @@ class phpbb_cache_test extends phpbb_database_test_case
 			$this->remove_cache_dir();
 		}
 		$this->create_cache_dir();
+
+		$this->driver = new phpbb_cache_driver_file($this->cache_dir);
 	}
 
 	protected function tearDown()
@@ -64,35 +67,24 @@ class phpbb_cache_test extends phpbb_database_test_case
 		rmdir($this->cache_dir);
 	}
 
-	public function test_cache_driver_file()
-	{
-		$driver = new phpbb_cache_driver_file($this->cache_dir);
-		$driver->put('test_key', 'test_value');
-		$driver->save();
-
-		$this->assertEquals(
-			'test_value',
-			$driver->get('test_key'),
-			'File ACM put and get'
-		);
-	}
-
 	public function test_cache_sql()
 	{
-		$driver = new phpbb_cache_driver_file($this->cache_dir);
-
 		global $db, $cache;
 		$db = $this->new_dbal();
-		$cache = new phpbb_cache_service($driver);
+		$cache = new phpbb_cache_service($this->driver);
 
 		$sql = "SELECT * FROM phpbb_config
 			WHERE config_name = 'foo'";
+
+		$cache_path = $this->cache_dir . 'sql_' . md5(preg_replace('/[\n\r\s\t]+/', ' ', $sql)) . '.php';
+		$this->assertFileNotExists($cache_path);
+
 		$result = $db->sql_query($sql, 300);
 		$first_result = $db->sql_fetchrow($result);
 		$expected = array('config_name' => 'foo', 'config_value' => '23', 'is_dynamic' => 0);
 		$this->assertEquals($expected, $first_result);
 
-		$this->assertFileExists($this->cache_dir . 'sql_' . md5(preg_replace('/[\n\r\s\t]+/', ' ', $sql)) . '.php');
+		$this->assertFileExists($cache_path);
 
 		$sql = 'DELETE FROM phpbb_config';
 		$result = $db->sql_query($sql);
@@ -112,33 +104,4 @@ class phpbb_cache_test extends phpbb_database_test_case
 
 		$db->sql_close();
 	}
-
-	public function test_null_cache_sql()
-	{
-		$driver = new phpbb_cache_driver_null($this->cache_dir);
-
-		global $db, $cache;
-		$db = $this->new_dbal();
-		$cache = new phpbb_cache_service($driver);
-
-		$sql = "SELECT * FROM phpbb_config
-			WHERE config_name = 'foo'";
-		$result = $db->sql_query($sql, 300);
-		$first_result = $db->sql_fetchrow($result);
-		$expected = array('config_name' => 'foo', 'config_value' => '23', 'is_dynamic' => 0);
-		$this->assertEquals($expected, $first_result);
-
-		$sql = 'DELETE FROM phpbb_config';
-		$result = $db->sql_query($sql);
-
-		// As null cache driver does not actually cache,
-		// this should return no results
-		$sql = "SELECT * FROM phpbb_config
-			WHERE config_name = 'foo'";
-		$result = $db->sql_query($sql, 300);
-
-		$this->assertSame(false, $db->sql_fetchrow($result));
-
-		$db->sql_close();
-	}
 }
diff --git a/tests/cache/null_driver_test.php b/tests/cache/null_driver_test.php
new file mode 100644
index 0000000000..86553d4dc5
--- /dev/null
+++ b/tests/cache/null_driver_test.php
@@ -0,0 +1,74 @@
+<?php
+/**
+*
+* @package testing
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+class phpbb_cache_null_driver_test extends phpbb_database_test_case
+{
+	protected $driver;
+
+	public function getDataSet()
+	{
+		return $this->createXMLDataSet(dirname(__FILE__) . '/fixtures/config.xml');
+	}
+
+	protected function setUp()
+	{
+		parent::setUp();
+
+		$this->driver = new phpbb_cache_driver_null;
+	}
+
+	public function test_get_put()
+	{
+		$this->assertSame(false, $this->driver->get('key'));
+
+		$this->driver->put('key', 'value');
+
+		// null driver does not cache
+		$this->assertSame(false, $this->driver->get('key'));
+	}
+
+	public function test_purge()
+	{
+		// does nothing
+		$this->driver->purge();
+	}
+
+	public function test_destroy()
+	{
+		// does nothing
+		$this->driver->destroy('foo');
+	}
+
+	public function test_cache_sql()
+	{
+		global $db, $cache;
+		$db = $this->new_dbal();
+		$cache = new phpbb_cache_service($this->driver);
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+		$result = $db->sql_query($sql, 300);
+		$first_result = $db->sql_fetchrow($result);
+		$expected = array('config_name' => 'foo', 'config_value' => '23', 'is_dynamic' => 0);
+		$this->assertEquals($expected, $first_result);
+
+		$sql = 'DELETE FROM phpbb_config';
+		$result = $db->sql_query($sql);
+
+		// As null cache driver does not actually cache,
+		// this should return no results
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+		$result = $db->sql_query($sql, 300);
+
+		$this->assertSame(false, $db->sql_fetchrow($result));
+
+		$db->sql_close();
+	}
+}
diff --git a/tests/cache/redis_driver_test.php b/tests/cache/redis_driver_test.php
new file mode 100644
index 0000000000..cd24e33baf
--- /dev/null
+++ b/tests/cache/redis_driver_test.php
@@ -0,0 +1,91 @@
+<?php
+/**
+*
+* @package testing
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+require_once dirname(__FILE__) . '/common_test_case.php';
+
+class phpbb_cache_redis_driver_test extends phpbb_cache_common_test_case
+{
+	protected static $config;
+	protected $driver;
+
+	public function getDataSet()
+	{
+		return $this->createXMLDataSet(dirname(__FILE__) . '/fixtures/config.xml');
+	}
+
+	static public function setUpBeforeClass()
+	{
+		if (!extension_loaded('redis'))
+		{
+			self::markTestSkipped('redis extension is not loaded');
+		}
+
+		$config = phpbb_test_case_helpers::get_test_config();
+		if (isset($config['redis_host']) || isset($config['redis_port']))
+		{
+			$host = isset($config['redis_host']) ? $config['redis_host'] : 'localhost';
+			$port = isset($config['redis_port']) ? $config['redis_port'] : 6379;
+			self::$config = array('host' => $host, 'port' => $port);
+		}
+		else
+		{
+			$this->markTestSkipped('Test redis host/port is not specified');
+		}
+	}
+
+	protected function setUp()
+	{
+		parent::setUp();
+
+		$this->driver = new phpbb_cache_driver_redis(self::$config['host'], self::$config['port']);
+		$this->driver->purge();
+	}
+
+	public function test_cache_sql()
+	{
+		global $db, $cache;
+		$db = $this->new_dbal();
+		$cache = new phpbb_cache_service($this->driver);
+
+		$redis = new Redis();
+		$ok = $redis->connect(self::$config['host'], self::$config['port']);
+		$this->assertTrue($ok);
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+
+		$key = $this->driver->key_prefix . 'sql_' . md5(preg_replace('/[\n\r\s\t]+/', ' ', $sql));
+		$this->assertFalse($redis->exists($key));
+
+		$result = $db->sql_query($sql, 300);
+		$first_result = $db->sql_fetchrow($result);
+		$expected = array('config_name' => 'foo', 'config_value' => '23', 'is_dynamic' => 0);
+		$this->assertEquals($expected, $first_result);
+
+		$this->assertTrue($redis->exists($key));
+
+		$sql = 'DELETE FROM phpbb_config';
+		$result = $db->sql_query($sql);
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+		$result = $db->sql_query($sql, 300);
+
+		$this->assertEquals($expected, $db->sql_fetchrow($result));
+
+		$sql = "SELECT * FROM phpbb_config
+			WHERE config_name = 'foo'";
+		$result = $db->sql_query($sql);
+
+		$no_cache_result = $db->sql_fetchrow($result);
+		$this->assertSame(false, $no_cache_result);
+
+		$db->sql_close();
+	}
+}
diff --git a/tests/test_framework/phpbb_test_case_helpers.php b/tests/test_framework/phpbb_test_case_helpers.php
index d10645a732..fe15eded90 100644
--- a/tests/test_framework/phpbb_test_case_helpers.php
+++ b/tests/test_framework/phpbb_test_case_helpers.php
@@ -91,6 +91,15 @@ class phpbb_test_case_helpers
 			{
 				$config['phpbb_functional_url'] = $phpbb_functional_url;
 			}
+
+			if (isset($phpbb_redis_host))
+			{
+				$config['redis_host'] = $phpbb_redis_host;
+			}
+			if (isset($phpbb_redis_port))
+			{
+				$config['redis_port'] = $phpbb_redis_port;
+			}
 		}
 
 		if (isset($_SERVER['PHPBB_TEST_DBMS']))
@@ -113,6 +122,16 @@ class phpbb_test_case_helpers
 			));
 		}
 
+		if (isset($_SERVER['PHPBB_TEST_REDIS_HOST']))
+		{
+			$config['redis_host'] = $_SERVER['PHPBB_TEST_REDIS_HOST'];
+		}
+
+		if (isset($_SERVER['PHPBB_TEST_REDIS_PORT']))
+		{
+			$config['redis_port'] = $_SERVER['PHPBB_TEST_REDIS_PORT'];
+		}
+
 		return $config;
 	}