diff --git a/modules/simpletest/drupal_web_test_case.php b/modules/simpletest/drupal_web_test_case.php
index aed66fa..94a9fa5 100644
--- a/modules/simpletest/drupal_web_test_case.php
+++ b/modules/simpletest/drupal_web_test_case.php
@@ -1464,6 +1623,42 @@ class DrupalWebTestCase extends DrupalTestCase {
     // profile's hook_install() and other hook implementations are never invoked.
     $conf['install_profile'] = $this->profile;
 
+    $use_cache = FALSE;
+    $use_modules_cache = FALSE;
+
+    if ($this->cacheModules) {
+      $modules = func_get_args();
+      // Modules can be either one parameter or multiple.
+      if (isset($modules[0]) && is_array($modules[0])) {
+        $modules = $modules[0];
+      }
+      $modules = array_unique($modules);
+      sort($modules);
+
+      $modules_cache_key_suffix = '_' . hash('crc32b', serialize($modules));
+      $use_modules_cache = $this->useCache($modules_cache_key_suffix);
+    }
+
+    if (!$use_modules_cache && $this->cache) {
+      $use_cache = $this->useCache();
+    }
+
+    if ($use_modules_cache || $use_cache) {
+      // Reset path variables.
+      variable_set('file_public_path', $this->public_files_directory);
+      variable_set('file_private_path', $this->private_files_directory);
+      variable_set('file_temporary_path', $this->temp_files_directory);
+      $this->refreshVariables();
+
+      // Load all enabled modules
+      module_load_all();
+
+      $this->assertTrue(TRUE, t('Using cache: @cache (@key)', array(
+        '@cache' => ($use_modules_cache ? 'Modules Cache' : 'Normal Cache'),
+        '@key' => $this->getCacheKey($use_modules_cache ? $modules_cache_key_suffix : ''),
+      )));
+    }
+    else {
       // Perform the actual Drupal installation.
       include_once DRUPAL_ROOT . '/includes/install.inc';
       drupal_install_system();
@@ -1488,6 +1683,12 @@ class DrupalWebTestCase extends DrupalTestCase {
       // Install the modules specified by the testing profile.
       module_enable($profile_details['dependencies'], FALSE);
 
+      if ($this->cache) {
+        $this->storeCache();
+      }
+    }
+
+    if (!$use_modules_cache) {
       // Install modules needed for this test. This could have been passed in as
       // either a single array argument or a variable number of string arguments.
       // @todo Remove this compatibility layer in Drupal 8, and only accept
@@ -1516,6 +1717,15 @@ class DrupalWebTestCase extends DrupalTestCase {
       // the installation process.
       drupal_cron_run();
 
+      if ($this->cacheModules) {
+        $this->storeCache($modules_cache_key_suffix);
+      }
+    }
+    else {
+      // Reset/rebuild all data structures after enabling the modules.
+      $this->resetAll();
+    }
+
     // Ensure that the session is not written to the new environment and replace
     // the global $user session with uid 1 from the new test site.
     drupal_save_session(FALSE);