Added Unittests for cache

fixed Lock & Cache bugs

tests/src/Core/Cache/RedisCacheDriverTest.php

@@ -0,0 +1,39 @@
+<?php
+
+
+namespace Friendica\Test\src\Core\Cache;
+
+
+use Friendica\Core\Cache\CacheDriverFactory;
+
+class RedisCacheDriverTest extends CacheTest
+{
+	/**
+	 * @var \Friendica\Core\Cache\IMemoryCacheDriver
+	 */
+	private $cache;
+
+	protected function getInstance()
+	{
+		if (class_exists('Redis')) {
+			try {
+				$this->cache = CacheDriverFactory::create('redis');
+			} catch (\Exception $exception) {
+				print "Redis - TestCase failed: " . $exception->getMessage();
+				throw new \Exception();
+			}
+			return $this->cache;
+		} else {
+			$this->markTestSkipped('Redis driver isn\'t available');
+			return null;
+		}
+	}
+
+	public function tearDown()
+	{
+		if (class_exists('Redis')) {
+			$this->cache->clear();
+		}
+		parent::tearDown();
+	}
+}