diff --git a/drupal_test_case.php b/drupal_test_case.php
index 4ddfc49..4b23256 100644
--- a/drupal_test_case.php
+++ b/drupal_test_case.php
@@ -2302,7 +2302,17 @@ protected function resetAll() {
    */
   protected function refreshVariables() {
     global $conf;
-    cache('bootstrap')->delete('variables');
+    if (!defined('DRUPAL_CORE_VERSION')) {
+    	define('DRUPAL_CORE_VERSION', "8");
+    }   
+
+
+    if (DRUPAL_CORE_VERSION == "7") {
+	cache_clear_all('variables', 'cache_bootstrap');
+    }
+    else {
+	cache('bootstrap')->delete('variables');
+    }
     $conf = variable_initialize();
   }
 
@@ -2385,7 +2395,17 @@ function setUp() {
     if (!defined('DRUPAL_ROOT')) {
       define('DRUPAL_ROOT', UPAL_ROOT);
     }
-    require_once DRUPAL_ROOT . '/core/includes/bootstrap.inc';
+    if (!defined("DRUPAL_CORE_VERSION")) {
+      define('DRUPAL_CORE_VERSION', "8");
+    }
+
+    if (DRUPAL_CORE_VERSION == "7") {
+    	require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+    }
+    // Assume D8
+    else {
+    	require_once DRUPAL_ROOT . '/core/includes/bootstrap.inc';
+    }
     drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
   }
 }
@@ -2488,8 +2508,16 @@ public function setUp() {
     //$_SERVER['REQUEST_METHOD']  = NULL;
     //$_SERVER['SERVER_SOFTWARE'] = NULL;
     //$_SERVER['HTTP_USER_AGENT'] = NULL;
+    if (!defined('DRUPAL_CORE_VERSION')) {
+	define('DRUPAL_CORE_VERSION', "8");
+    }
 
-    require_once DRUPAL_ROOT . '/core/includes/bootstrap.inc';
+    if (DRUPAL_CORE_VERSION == "7") {
+	require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+    }
+    else {
+	require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+    }
     drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
 
     // Enable modules for this test.
@@ -2532,6 +2560,8 @@ function upal_init() {
   // The URL that browser based tests should use.
   define('UPAL_WEB_URL', getenv('UPAL_WEB_URL') ? getenv('UPAL_WEB_URL') : (isset($GLOBALS['UPAL_WEB_URL']) ? $GLOBALS['UPAL_WEB_URL'] : 'http://upal'));
 
+  define('DRUPAL_CORE_VERSION', getenv('DRUPAL_CORE_VERSION') ? getenv('DRUPAL_CORE_VERSION') :(isset($GLOBALS['DRUPAL_CORE_VERSION']) ? $GLOBALS['DRUPAL_CORE_VERSION'] : "8"));
+
   define('UPAL_TMP', getenv('UPAL_TMP') ? getenv('UPAL_TMP') : (isset($GLOBALS['UPAL_TMP']) ? $GLOBALS['UPAL_TMP'] : sys_get_temp_dir()));
   // define('UNISH_SANDBOX', UNISH_TMP . '/drush-sandbox');
 
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index cadea55..1168507 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -25,6 +25,9 @@
     <!--You currently need 'master' branch of drush after 2011.07.21. Drush 4.6 will be OK - http://drupal.org/node/1105514-->
     <!--<var name="UNISH_DRUSH" value="/Users/mw/bin/drush"/>-->
 
+    <!-- Indicate your drupal core version. Defaults to Drupal 8. Not tested with D6 or older.-->
+    <!-- <var name="DRUPAL_CORE_VERSION" value="7" /> -->
+
     <includePath>.</includePath>
   </php>
-</phpunit>
\ No newline at end of file
+</phpunit>