diff -u b/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
--- b/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -123,6 +123,8 @@
       // profiles because modules migh tbe inside those.
       $profiles_scanner = new SystemListing();
       $all_profiles = $profiles_scanner ->scan('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.profile$/', 'profiles');
+      // If a module is within a profile directory but specifies another
+      // profile for testing, it needs to be found it in the parent profile.
       if (!empty($GLOBALS['drupal_test_info']['original_config_directory_active'])) {
         $config_directory = $GLOBALS['drupal_test_info']['original_config_directory_active'];
         if (empty($config_directory['absolute'])) {
only in patch2:
unchanged:
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -2547,6 +2547,7 @@ function drupal_valid_test_ua($new_prefix = NULL) {
     // and the HMAC must match.
     if ($time_diff >= 0 && $time_diff <= 5 && $hmac == drupal_hmac_base64($check_string, $key)) {
       $test_prefix = $prefix;
+      $GLOBALS['drupal_test_info']['original_config_directory_active'] = $GLOBALS['config_directories']['active'];
       return $test_prefix;
     }
   }
only in patch2:
unchanged:
--- a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
@@ -817,6 +817,7 @@ protected function prepareEnvironment() {
     $this->originalContainer = clone drupal_container();
     $this->originalLanguage = $language_interface;
     $this->originalConfigDirectories = $GLOBALS['config_directories'];
+    $GLOBALS['drupal_test_info']['original_config_directory_active'] = $GLOBALS['config_directories']['active'];
     $this->originalThemeKey = $GLOBALS['theme_key'];
     $this->originalTheme = $GLOBALS['theme'];