diff --git tests/t3lib/t3lib_divTest.php tests/t3lib/t3lib_divTest.php
index c5e4fb1..4826d2e 100644
--- tests/t3lib/t3lib_divTest.php
+++ tests/t3lib/t3lib_divTest.php
@@ -33,11 +33,22 @@
  * @subpackage t3lib
  */
 class t3lib_divTest extends tx_phpunit_testcase {
+
 	/**
 	 * Enable backup of global and system variables
+	 *
+	 * @var boolean
 	 */
 	protected $backupGlobals = TRUE;
 
+	/**
+	 * Exclude TYPO3_DB from backup/ restore of $GLOBALS
+	 * because resource types cannot be handled during serializing
+	 *
+	 * @var array
+	 */
+	protected $backupGlobalsBlacklist = array('TYPO3_DB');
+
 
 	///////////////////////////////
 	// Tests concerning validIP
diff --git tests/t3lib/t3lib_spritemanagerTest.php tests/t3lib/t3lib_spritemanagerTest.php
index c7e863d..1278734 100644
--- tests/t3lib/t3lib_spritemanagerTest.php
+++ tests/t3lib/t3lib_spritemanagerTest.php
@@ -31,10 +31,21 @@
  * @subpackage t3lib
  */
 class t3lib_SpriteManagerTest extends tx_phpunit_testcase {
+
 	/**
 	 * Enable backup of global and system variables
+	 *
+	 * @var boolean
+	 */
+	protected $backupGlobals = TRUE;
+
+	/**
+	 * Exclude TYPO3_DB from backup/ restore of $GLOBALS
+	 * because resource types cannot be handled during serializing
+	 *
+	 * @var array
 	 */
-	public $backupGlobals = TRUE;
+	protected $backupGlobalsBlacklist = array('TYPO3_DB');
 
 
 	//////////////////////////////////////////
diff --git tests/t3lib/t3lib_tcemainTest.php tests/t3lib/t3lib_tcemainTest.php
index b564f10..4079727 100644
--- tests/t3lib/t3lib_tcemainTest.php
+++ tests/t3lib/t3lib_tcemainTest.php
@@ -31,10 +31,21 @@
  * @author Oliver Klee <typo3-coding@oliverklee.de>
  */
 class t3lib_tcemainTest extends tx_phpunit_testcase {
+
+	/**
+	 * Enable backup of global and system variables
+	 *
+	 * @var boolean
+	 */
+	protected $backupGlobals = TRUE;
+
 	/**
-	 * @var	boolean
+	 * Exclude TYPO3_DB from backup/ restore of $GLOBALS
+	 * because resource types cannot be handled during serializing
+	 *
+	 * @var array
 	 */
-	protected $backupGlobals = true;
+	protected $backupGlobalsBlacklist = array('TYPO3_DB');
 
 	/**
 	 * @var t3lib_TCEmain