diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 38c360b..af1fdf1 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -320,19 +320,12 @@ function simpletest_test_get_all() {
     // checks below will find them.
     simpletest_classloader_register();
 
-    // Load test information from cache if available, otherwise retrieve the
-    // information from each tests getInfo() method.
-    if ($cache = cache()->get('simpletest')) {
-      $groups = $cache->data;
-    }
-    else {
       // Select all clases in files ending with .test.
       // @todo: Remove this once all tests have been ported to PSR-0.
       $classes = db_query("SELECT name FROM {registry} WHERE type = :type AND filename LIKE :name", array(':type' => 'class', ':name' => '%.test'))->fetchCol();
 
-      // Select all PSR-0 classes in the Tests namespace of all modules.
+    // Find all PSR-0 classes in the Tests namespace of all modules.
       $system_list = db_query("SELECT name, filename FROM {system}")->fetchAllKeyed();
-
       foreach ($system_list as $name => $filename) {
         // Build directory in which the test files would reside.
         $tests_dir = DRUPAL_ROOT . '/' . dirname($filename) . '/lib/Drupal/' . $name . '/Tests';
@@ -383,8 +376,6 @@ function simpletest_test_get_all() {
 
       // Allow modules extending core tests to disable originals.
       drupal_alter('simpletest', $groups);
-      cache()->set('simpletest', $groups);
-    }
   }
   return $groups;
 }
@@ -393,7 +384,7 @@ function simpletest_test_get_all() {
  * Registers namespaces for disabled modules.
  */
 function simpletest_classloader_register() {
-  // Get the cached test modules list and register a test namespace for each.
+  // Register the namespaces of all modules that are not enabled.
   $disabled_modules = db_query("SELECT name, filename FROM {system} WHERE status = 0")->fetchAllKeyed();
   if ($disabled_modules) {
     foreach ($disabled_modules as $name => $filename) {