增加Cache/Lite单元测试 (#188)

* 增加lite单元测试

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

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+<?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>
+// +----------------------------------------------------------------------
+
+/**
+ * Lite缓存驱动测试
+ * @author    刘志淳 <chun@engineer.com>
+ */
+
+namespace tests\thinkphp\library\think\cache\driver;
+
+use think\Cache;
+
+class liteTest extends \PHPUnit_Framework_TestCase
+{
+    protected function getCacheInstance()
+    {
+        return Cache::connect(['type' => 'Lite', 'path' => CACHE_PATH]);
+    }
+
+    /**
+     * 测试缓存读取
+     * @return  mixed
+     * @access public
+     */
+    public function testGet()
+    {
+        $cache = $this->getCacheInstance();
+        $this->assertFalse($cache->get('test'));
+    }
+
+    /**
+     * 测试缓存设置
+     * @return  mixed
+     * @access public
+     */
+    public function testSet()
+    {
+        $cache = $this->getCacheInstance();
+        $this->assertNotEmpty($cache->set('test', 'test'));
+    }
+
+    /**
+     * 删除缓存测试
+     * @return  mixed
+     * @access public
+     */
+    public function testRm()
+    {
+        $cache = $this->getCacheInstance();
+        $this->assertTrue($cache->rm('test'));
+    }
+
+    /**
+     * 清空缓存测试
+     * @return  mixed
+     * @access public
+     */
+    public function testClear()
+    {
+    }
+}