增加Memcache缓存驱动

tests/thinkphp/library/think/cache/driver/memcacheTest.php

@@ -0,0 +1,49 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: liu21st <liu21st@gmail.com>
+// +----------------------------------------------------------------------
+
+/**
+ * Memcache缓存驱动测试
+ * @author    刘志淳 <chun@engineer.com>
+ */
+
+namespace tests\thinkphp\library\think\cache\driver;
+
+class memcacheTest extends cacheTestCase
+{
+    private $_cacheInstance = null;
+
+    /**
+     * 基境缓存类型
+     */
+    protected function setUp()
+    {
+        if (!extension_loaded('memcache')) {
+            $this->markTestSkipped("Memcache没有安装，已跳过测试！");
+        }
+        \think\Cache::connect(['type' => 'memcache', 'expire' => 2]);
+    }
+
+    /**
+     * @return ApcCache
+     */
+    protected function getCacheInstance()
+    {
+        if (null === $this->_cacheInstance) {
+            $this->_cacheInstance = new \think\cache\driver\Memcache(['length' => 3]);
+        }
+        return $this->_cacheInstance;
+    }
+
+    // skip testExpire
+    public function testExpire()
+    {
+    }
+}