* Add switchDB by tests.

test/model/execution/unlinkcases.php

@@ -2,6 +2,7 @@
 <?php
 include dirname(dirname(dirname(__FILE__))) . '/lib/init.php';
 include dirname(dirname(dirname(__FILE__))) . '/class/execution.class.php';
+$db->switchDB();
 su('admin');
 
 /**
@@ -26,4 +27,4 @@ r($execution->unlinkCasesTest($executionIDList[0], $products[0], $stories[0])) &
 r($execution->unlinkCasesTest($executionIDList[1], $products[1], $stories[1])) && p() && e('0'); // 瀑布执行解除关联用例
 r($execution->unlinkCasesTest($executionIDList[2], $products[2], $stories[2])) && p() && e('0'); // 看板执行解除关联用例
 
-system("./ztest init");
+$db->restoreDB();