gistfile1

Index: sapphire/dev/TestRunner.php
===================================================================
--- sapphire/dev/TestRunner.php	(revision 98430)
+++ sapphire/dev/TestRunner.php	(working copy)
@@ -206,6 +206,18 @@
 	 * @param boolean $coverage
 	 */
 	function runTests($classList, $coverage = false) {
+		if(!empty($_GET['testdb'])) {
+			if(class_exists($_GET['testdb']) && is_subclass_of($_GET['testdb'], 'SS_Database')) {
+				$dbClass = $_GET['testdb'];
+				DB::setConn(new $dbClass(array(
+					'memory' => true
+				)), 'test');
+				
+			} else {
+				throw new SS_HTTPResponse_Exception("Bad database class '{$_GET['testdb']}'", 400);
+			}
+		}
+		
 		$startTime = microtime(true);
 		
 		// XDEBUG seem to cause problems with test execution :-(
Index: sapphire/dev/SapphireTest.php
===================================================================
--- sapphire/dev/SapphireTest.php	(revision 98430)
+++ sapphire/dev/SapphireTest.php	(working copy)
@@ -578,8 +578,11 @@
 	 * @todo Make this db agnostic
 	 */
 	static function create_temp_db() {
-		// Create a temporary database
-		$dbConn = DB::getConn();
+		// Switch the 'test' db conn if it's available
+		$dbConn = DB::getConn('test');
+		if($dbConn) DB::setConn($dbConn);
+		else $dbConn = DB::getConn();
+		
 		$dbname = 'tmpdb' . rand(1000000,9999999);
 		while(!$dbname || $dbConn->databaseExists($dbname)) {
 			$dbname = 'tmpdb' . rand(1000000,9999999);