[task/acm-refactor] Refactor the ACM classes to have a common interface.

They are now refered to as cache drivers rather than ACM classes. The
additional utility functions from the original cache class have been
moved to the cache_service. The class loader is now instantiated without
a cache instance and passed one as soon as it is constructed to allow
autoloading the cache classes.

PHPBB3-9983

tests/cache/cache_test.php

@@ -0,0 +1,39 @@
+<?php
+/**
+*
+* @package testing
+* @version $Id$
+* @copyright (c) 2010 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+require_once 'test_framework/framework.php';
+
+class phpbb_cache_test extends phpbb_test_case
+{
+	protected function tearDown()
+	{
+		$iterator = new DirectoryIterator('cache/tmp');
+		foreach ($iterator as $file)
+		{
+			if (is_file('cache/tmp/' . $file))
+			{
+				unlink('cache/tmp/' . $file);
+			}
+		}
+	}
+
+	public function test_acm_file()
+	{
+		$acm = new phpbb_cache_driver_file('cache/tmp/');
+		$acm->put('test_key', 'test_value');
+		$acm->save();
+		
+		$this->assertEquals(
+			'test_value',
+			$acm->get('test_key'),
+			'File ACM put and get'
+		);
+	}
+}