* Add switchDB by tests.

test/model/build/unlinkbug.php

@@ -2,6 +2,7 @@
 <?php
 include dirname(dirname(dirname(__FILE__))) . '/lib/init.php';
 include dirname(dirname(dirname(__FILE__))) . '/class/build.class.php';
+$db->switchDB();
 su('admin');
 
 /**
@@ -25,4 +26,4 @@ r($build->unlinkBugTest($buildIDList[0],$bugs,$bugs[0])) && p('1:bugs,project')
 r($build->unlinkBugTest($buildIDList[1],$bugs,$bugs[1])) && p('11:bugs,execution') && e(',301,101');              //执行版本解除bug
 r($build->unlinkBugTest($buildIDList[1],$bugs,''))       && p('objectID:0')        && e('『对象ID』应当是数字。');//不传入BugID
 
-system("./ztest init");
+$db->restoreDB();