added tests for cache

tests/unit/framework/caching/WinCacheTest.php

@@ -0,0 +1,31 @@
+<?php
+namespace yiiunit\framework\caching;
+use yii\caching\FileCache;
+use yiiunit\TestCase;
+
+/**
+ * Class for testing wincache backend
+ */
+class WinCacheTest extends CacheTest
+{
+	private $_cacheInstance = null;
+
+	/**
+	 * @return WinCache
+	 */
+	protected function getCacheInstance()
+	{
+		if(!extension_loaded('wincache')) {
+			$this->markTestSkipped("Wincache not installed. Skipping.");
+		}
+
+		if(!ini_get('wincache.ucenabled')) {
+			$this->markTestSkipped("Wincache user cache disabled. Skipping.");
+		}
+
+		if($this->_cacheInstance === null) {
+			$this->_cacheInstance = new WinCache();
+		}
+		return $this->_cacheInstance;
+	}
+}