=== modified file 'modules/simpletest/tests/common.test'
--- modules/simpletest/tests/common.test	2010-01-07 07:45:03 +0000
+++ modules/simpletest/tests/common.test	2010-01-07 13:37:05 +0000
@@ -494,6 +494,11 @@ class DrupalTagsHandlingTestCase extends
  * Test the Drupal CSS system.
  */
 class CascadingStylesheetsTestCase extends DrupalWebTestCase {
+  /**
+   * Store configured value for CSS preprocessing.
+   */
+  protected $preprocess_css = NULL;
+  
   public static function getInfo() {
     return array(
       'name' => 'Cascading stylesheets',
@@ -504,9 +509,19 @@ class CascadingStylesheetsTestCase exten
 
   function setUp() {
     parent::setUp('php', 'locale');
+    // Ensure CSS preprocessing is disabled.
+    $this->preprocess_js = variable_get('preprocess_css', 0);
+    variable_set('preprocess_css', 0);
+ 
     // Reset drupal_add_css() before each test.
     drupal_static_reset('drupal_add_css');
   }
+  
+  function tearDown() {
+    // Restore configured value for CSS preprocessing.
+    variable_set('preprocess_css', $this->preprocess_css);
+    parent::tearDown();
+  }
 
   /**
    * Check default stylesheets as empty.

=== modified file 'profiles/standard/standard.install'
--- profiles/standard/standard.install	2010-01-04 23:08:34 +0000
+++ profiles/standard/standard.install	2010-01-07 13:20:21 +0000
@@ -411,4 +411,7 @@ function standard_install() {
     ->execute();
   variable_set('admin_theme', 'seven');
   variable_set('node_admin_theme', '1');
+
+  // Enable CSS Preprocessing
+  variable_set('preprocess_css', 1);
 }